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Raubenheimer D, Simpson SJ. Protein appetite as an integrator in the obesity system: the protein leverage hypothesis. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220212. [PMID: 37661737 PMCID: PMC10475875 DOI: 10.1098/rstb.2022.0212] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/21/2023] [Indexed: 09/05/2023] Open
Abstract
Despite the large volume and extensive range of obesity research, there is substantial disagreement on the causes and effective preventative strategies. We suggest the field will benefit from greater emphasis on integrative approaches that examine how various potential contributors interact, rather than regarding them as competing explanations. We demonstrate the application of nutritional geometry, a multi-nutrient integrative framework developed in the ecological sciences, to obesity research. Such studies have shown that humans, like many other species, regulate protein intake more strongly than other dietary components, and consequently if dietary protein is diluted there is a compensatory increase in food intake-a process called protein leverage. The protein leverage hypothesis (PLH) proposes that the dilution of protein in modern food supplies by fat and carbohydrate-rich highly processed foods has resulted in increased energy intake through protein leverage. We present evidence for the PLH from a variety of sources (mechanistic, experimental and observational), and show that this mechanism is compatible with many other findings and theories in obesity research. This article is part of a discussion meeting issue 'Causes of obesity: theories, conjectures and evidence (Part II)'.
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Affiliation(s)
- David Raubenheimer
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Stephen J. Simpson
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales 2006, Australia
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2
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Manoochehri Z, Moghimbeigi A, Ezzati-Rastegar K, Faradmal J. Pattern of weight gain in pregnant women in slum areas of Hamadan using multilevel ordinal regression. BMC Public Health 2023; 23:187. [PMID: 36707805 PMCID: PMC9883965 DOI: 10.1186/s12889-023-15090-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 01/18/2023] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Adequate gestational weight gain (GWG) is an important factor for maternal and fetal health. This is especially important in low-income and slum areas due to limited access to health services and malnutrition. Thus, the purpose of this study is to evaluate the pattern of GWG changes in the slum areas of Hamadan in Iran. METHODS In this longitudinal study, the study sample consisted of 509 pregnant women who referred to nine health care clinics in the slum areas of Hamadan. Women's weight gain based on the recommended GWG by U.S. Institute of Medicine (IOM) was divided into three categories: Inadequate weight gain, Adequate weight gain, and Excessive weight gain. In order to evaluate the trend of GWG, a multi-level ordinal model was used. RESULTS According to pre-pregnancy BMI, a little more than half people (56.6%) were overweight or obese. 85.4% women in the first trimester and 49.1% in the second trimester did not have adequate GWG, but in the third trimester (38.9%) had adequate GWG. Based on multivariate analysis, pre- pregnancy BMI has a significant effect on the odds of inadequate GWG (P-value = 0.021); with one unit increase in pre-pregnancy BMI, the odds of inadequate GWG grows by 1.07 times compared to adequate and excessive GWG. CONCLUSIONS In general, women did not have adequate weight gain in the first and second trimesters.Thus, designing appropriate interventions to achieve optimal GWG seems to be necessary in slums.
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Affiliation(s)
- Zohreh Manoochehri
- grid.411950.80000 0004 0611 9280Department of Biostatistics, Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Abbas Moghimbeigi
- grid.411705.60000 0001 0166 0922Department of Biostatistics and Epidemiology, Faculty of Health & Health, Safety and Environment Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Khadije Ezzati-Rastegar
- grid.411950.80000 0004 0611 9280Department of Public Health, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Javad Faradmal
- Modeling of Noncommunicable Diseases Research Center, Department of Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
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3
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Martins MS, Nascimento MH, Barbosa LL, Campos LC, Singh MN, Martin FL, Romão W, Filgueiras PR, Barauna VG. Detection and quantification using ATR-FTIR spectroscopy of whey protein concentrate adulteration with wheat flour. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.114161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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4
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Malik A, Li M, Lenzen M, Fry J, Liyanapathirana N, Beyer K, Boylan S, Lee A, Raubenheimer D, Geschke A, Prokopenko M. Impacts of climate change and extreme weather on food supply chains cascade across sectors and regions in Australia. NATURE FOOD 2022; 3:631-643. [PMID: 37118599 DOI: 10.1038/s43016-022-00570-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 07/13/2022] [Indexed: 04/30/2023]
Abstract
Disasters resulting from climate change and extreme weather events adversely impact crop and livestock production. While the direct impacts of these events on productivity are generally well known, the indirect supply-chain repercussions (spillovers) are still unclear. Here, applying an integrated modelling framework that considers economic and physical factors, we estimate spillovers in terms of social impacts (for example, loss of job and income) and health impacts (for example, nutrient availability and diet quality) resulting from disruptions in food supply chains, which cascade across regions and sectors. Our results demonstrate that post-disaster impacts are wide-ranging and diverse owing to the interconnected nature of supply chains. We find that fruit, vegetable and livestock sectors are the most affected, with effects flowing on to other non-food production sectors such as transport services. The ability to cope with disasters is determined by socio-demographic characteristics, with communities in rural areas being most affected.
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Affiliation(s)
- Arunima Malik
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia.
- Sydney Business School, The University of Sydney, Sydney, New South Wales, Australia.
| | - Mengyu Li
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia
| | - Manfred Lenzen
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia
| | - Jacob Fry
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia
| | - Navoda Liyanapathirana
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Kathleen Beyer
- Climate and Atmospheric Science, Department of Planning, Industry and Environment, Sydney, New South Wales, Australia
| | - Sinead Boylan
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
- School of Public Health, The University of Sydney, Sydney, New South Wales, Australia
| | - Amanda Lee
- School of Public Health, The University of Queensland, Herston, Queensland, Australia
| | - David Raubenheimer
- Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - Arne Geschke
- ISA, School of Physics A28, The University of Sydney, Sydney, New South Wales, Australia
| | - Mikhail Prokopenko
- Centre for Complex Systems, The University of Sydney, Sydney, New South Wales, Australia
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Liyanapathirana NN, Grech A, Li M, Malik A, Lenzen M, Raubenheimer D. Nutrient-sensitive approach for sustainability assessment of different dietary patterns in Australia. Am J Clin Nutr 2022; 115:1048-1058. [PMID: 34982816 DOI: 10.1093/ajcn/nqab429] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 12/29/2021] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Understanding the relation between sustainability and nutrients is important in devising healthy and sustainable diets. However, there are no prevailing methodologies to assess sustainability at the nutrient level. OBJECTIVES The aim was to examine and demonstrate the potential of integrating input-output analysis with nutritional geometry to link environmental, economic, and health associations of dietary scenarios in Australia with macronutrients. METHODS One-day dietary recalls of 9341 adult respondents (age ≥18 y) of the latest available cross-sectional National Nutrition and Physical Activity Survey-2011/12 of Australia were integrated with the input-output data obtained from the Australian Industrial Ecology Virtual Laboratory to calculate the environmental and economic impacts of dietary intakes in Australia. Australian adults' dietary intakes were classified into 3 dietary scenarios: "vegan," "pescatarian," and "omnivorous." Then, the relations between nutritional, economic, and environmental characteristics of the 3 dietary scenarios were demonstrated with the diets' macronutrient composition in a multidimensional nutritional geometry representation to link the sustainability indicators with macronutrients. RESULTS Nutrient density and economic and environmental indicators increased as the percentage of energy from proteins increased and decreased as the percentage of energy from fats increased for the 3 dietary scenarios, except for the nutrient density and water use of the "vegan" dietary scenario. Energy density increased as the percentage of energy from fats increased and decreased as the percentage of energy from proteins increased for "pescatarian" and "omnivorous" dietary scenarios. In the "vegan" dietary scenario, nutrient density and water use increased as the percentage of energy from proteins increased; however, these decreased as the percentage of energy from carbohydrates increased, instead of fats. CONCLUSIONS The study presents a new approach to analyzing the relations between sustainability indicators, foods, and macronutrients and establishes that proteins, irrespective of the source of protein, are driving dietary environmental and economic impacts.
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Affiliation(s)
- Navoda Nirmani Liyanapathirana
- The School of Life and Environmental Sciences, Charles Perkins Centre, The University of Sydney, Sydney, Australia.,Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, Sydney, Australia
| | - Amanda Grech
- The School of Life and Environmental Sciences, Charles Perkins Centre, The University of Sydney, Sydney, Australia
| | - Mengyu Li
- Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, Sydney, Australia
| | - Arunima Malik
- Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, Sydney, Australia
| | - Manfred Lenzen
- Centre for Integrated Sustainability Analysis, School of Physics, The University of Sydney, Sydney, Australia
| | - David Raubenheimer
- The School of Life and Environmental Sciences, Charles Perkins Centre, The University of Sydney, Sydney, Australia
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6
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Meal-to-meal and day-to-day macronutrient variation in an ad libitum vending food paradigm. Appetite 2022; 171:105944. [PMID: 35074459 PMCID: PMC8842501 DOI: 10.1016/j.appet.2022.105944] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 01/11/2022] [Accepted: 01/18/2022] [Indexed: 11/22/2022]
Abstract
BACKGROUND Theory posits that macronutrient intake is regulated by protein consumption and adequate intake of protein results in consumption of less carbohydrates and fat. The current study investigates the effect of protein intake on calorie and macronutrient content using an ad libitum vending machine paradigm. METHODS Healthy volunteers (n = 287; 177 m; Age = 36 ± 11; BMI = 32 ± 8) were admitted to our clinical research unit. Macronutrient meal content (grams) and energy intake (Kcal) were quantified by specialized food processing software and collected on an hourly basis over a three-day period using a validated ad libitum vending machine paradigm. Body composition was assessed by DXA. Lagged multi-level models accounting for age, sex, race/ethnicity, fat and fat free mass indices were fitted to examine the impact of prior macronutrient content on subsequent meals. RESULTS Protein intake was associated with decreased energy intake (Kcal; B = -1.67 kcal, p = 0.0048), lower protein and carbohydrate intake (B = -0.08 g, p = 0.0006; B = -0.21 g, p = 0.0003, respectively) at subsequent meals. Daily Macronutrient intake and subsequent intake were positively associated. CONCLUSIONS Dietary protein exhibits a negative regulatory effect on a short-term meal-to-meal rather than day-to-day basis. In the setting of readily available food, protein intake impacts energy intake only over very short time courses.
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Malsagova KA, Kopylov AT, Sinitsyna AA, Stepanov AA, Izotov AA, Butkova TV, Chingin K, Klyuchnikov MS, Kaysheva AL. Sports Nutrition: Diets, Selection Factors, Recommendations. Nutrients 2021; 13:nu13113771. [PMID: 34836029 PMCID: PMC8619485 DOI: 10.3390/nu13113771] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/17/2021] [Accepted: 10/23/2021] [Indexed: 12/22/2022] Open
Abstract
An athlete’s diet is influenced by external and internal factors that can reduce or exacerbate exercise-induced food intolerance/allergy symptoms. This review highlights many factors that influence food choices. However, it is important to remember that these food choices are dynamic, and their effectiveness varies with the time, location, and environmental factors in which the athlete chooses the food. Therefore, before training and competition, athletes should follow the recommendations of physicians and nutritionists. It is important to study and understand the nutritional strategies and trends that athletes use before and during training or competitions. This will identify future clinical trials that can be conducted to identify specific foods that athletes can consume to minimize negative symptoms associated with their consumption and optimize training outcomes.
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Affiliation(s)
- Kristina A. Malsagova
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
- Correspondence: ; Tel.: +7-(499)-764-9878
| | - Arthur T. Kopylov
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
| | - Alexandra A. Sinitsyna
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
| | - Alexander A. Stepanov
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
| | - Alexander A. Izotov
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
| | - Tatyana V. Butkova
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
| | - Konstantin Chingin
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, China;
| | - Mikhail S. Klyuchnikov
- State Research Center Burnasyan of the Federal Medical Biophysical Centre of the Federal Medical Biological Agency of Russia, 123098 Moscow, Russia;
| | - Anna L. Kaysheva
- Biobanking Group, Branch of IBMC “Scientific and Education Center” Bolshoy Nikolovorobinsky Lane, 109028 Moscow, Russia; (A.T.K.); (A.A.S.); (A.A.S.); (A.A.I.); (T.V.B.); (A.L.K.)
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8
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Kirwan R, McCullough D, Butler T, Perez de Heredia F, Davies IG, Stewart C. Sarcopenia during COVID-19 lockdown restrictions: long-term health effects of short-term muscle loss. GeroScience 2020; 42:1547-1578. [PMID: 33001410 PMCID: PMC7528158 DOI: 10.1007/s11357-020-00272-3] [Citation(s) in RCA: 166] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 09/16/2020] [Indexed: 12/16/2022] Open
Abstract
The COVID-19 pandemic is an extraordinary global emergency that has led to the implementation of unprecedented measures in order to stem the spread of the infection. Internationally, governments are enforcing measures such as travel bans, quarantine, isolation, and social distancing leading to an extended period of time at home. This has resulted in reductions in physical activity and changes in dietary intakes that have the potential to accelerate sarcopenia, a deterioration of muscle mass and function (more likely in older populations), as well as increases in body fat. These changes in body composition are associated with a number of chronic, lifestyle diseases including cardiovascular disease (CVD), diabetes, osteoporosis, frailty, cognitive decline, and depression. Furthermore, CVD, diabetes, and elevated body fat are associated with greater risk of COVID-19 infection and more severe symptomology, underscoring the importance of avoiding the development of such morbidities. Here we review mechanisms of sarcopenia and their relation to the current data on the effects of COVID-19 confinement on physical activity, dietary habits, sleep, and stress as well as extended bed rest due to COVID-19 hospitalization. The potential of these factors to lead to an increased likelihood of muscle loss and chronic disease will be discussed. By offering a number of home-based strategies including resistance exercise, higher protein intakes and supplementation, we can potentially guide public health authorities to avoid a lifestyle disease and rehabilitation crisis post-COVID-19. Such strategies may also serve as useful preventative measures for reducing the likelihood of sarcopenia in general and in the event of future periods of isolation.
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Affiliation(s)
- Richard Kirwan
- School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK.
| | - Deaglan McCullough
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
| | - Tom Butler
- Department of Clinical Sciences and Nutrition, University of Chester, Chester, UK.
| | - Fatima Perez de Heredia
- School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK
| | - Ian G Davies
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
| | - Claire Stewart
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
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Deprivation or discrimination? Comparing two explanations for the reverse income-obesity gradient in the US and South Korea. J Biosoc Sci 2020; 54:1-20. [PMID: 33153504 DOI: 10.1017/s0021932020000632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In high-income countries, poverty is often associated with higher average body mass index (BMI). To account for this reverse gradient, deprivation theories posit that declining economic resources make it more difficult to maintain a healthy weight. By contrast, discrimination theories argue that anti-fat discrimination in hiring and marriage sorts heavier individuals into lower-income households. This study assesses competing predictions of these theories by examining how household income in representative samples from South Korea (2007-2014, N=20,823) and the US (1999-2014, N=6395) is related to BMI in two key contrasting groups: (1) currently-married and (2) never-married individuals. As expected by anti-fat discrimination in marriage, the reverse gradient is observed among currently-married women but not among never-married women in both countries. Also consistent with past studies no evidence was found for a reverse gradient among men. These findings are consistent with anti-fat discrimination in marriage as a key cause of the reverse gradient and raise serious challenges to deprivation accounts as well as explanations based on anti-fat discrimination in labour markets.
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10
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Raubenheimer D, Simpson SJ. Protein Leverage: Theoretical Foundations and Ten Points of Clarification. Obesity (Silver Spring) 2019; 27:1225-1238. [PMID: 31339001 DOI: 10.1002/oby.22531] [Citation(s) in RCA: 79] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/29/2019] [Indexed: 12/21/2022]
Abstract
Much attention has been focused on fats and carbohydrates as the nutritional causes of energy overconsumption and obesity. In 2003, a model of intake regulation was proposed in which the third macronutrient, protein, is not only involved but is a primary driver of calorie intake via its interactions with carbohydrates and fats. This model, called protein leverage, posits that the strong regulation of protein intake causes the overconsumption of fats and carbohydrates (hence total energy) on diets with a low proportion of energy from protein and their underconsumption on diets with a high proportion of protein. Protein leverage has since been demonstrated in a range of animal studies and in several studies of human macronutrient regulation, and its potential role in contributing to the obesity epidemic is increasingly attracting discussion. Over recent years, however, several misconceptions about protein leverage have arisen. Our aim in this paper is to briefly outline some key aspects of the underlying theory and clarify 10 points of misunderstanding that have the potential to divert attention from the substantive issues.
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Affiliation(s)
- David Raubenheimer
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
| | - Stephen J Simpson
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales, Australia
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Coffey J, Raubenheimer D, Rangan A, Allman-Farinelli M, Simpson SJ, O'Leary F. MasterChef recipes and takeaway foods: How do they compare? Int J Gastron Food Sci 2019. [DOI: 10.1016/j.ijgfs.2019.100148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rapkin J, Jensen K, House CM, Wilson AJ, Hunt J. Genotype-by-sex-by-diet interactions for nutritional preference, dietary consumption, and lipid deposition in a field cricket. Heredity (Edinb) 2018; 121:361-373. [PMID: 30089778 DOI: 10.1038/s41437-018-0130-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 07/05/2018] [Accepted: 07/14/2018] [Indexed: 12/13/2022] Open
Abstract
Changes in feeding behaviour, especially the overconsumption of calories, has led to a rise in the rates of obesity, diabetes, and other associated disorders in humans and a range of animals inhabiting human-influenced environments. However, understanding the relative contribution of genes, the nutritional environment, and their interaction to dietary intake and lipid deposition in the sexes still remains a major challenge. By combining nutritional geometry with quantitative genetics, we determined the effect of genes, the nutritional environment, and their interaction on the total nutritional preference (TP), total diet eaten (TE), and lipid mass (LM) of male and female black field crickets (Teleogryllus commodus) fed one of four diet pairs (DPs) differing in the ratio of protein to carbohydrate and total nutritional content. We found abundant additive genetic variance for TP, TE, and LM in both sexes and across all four DPs, with significant genetic correlations between TE and TP and between TP and LM in males. We also found significant genotype-by-DP and genotype-by-sex-by-DP interactions for each trait and significant genotype-by-sex interactions for TE and LM. Complex interactions between genes, sex, and the nutritional environment, therefore, play an important role in nutrient regulation and lipid deposition in T. commodus. This finding may also help explain the increasing rate of obesity and the maintenance of sex differences in obesity observed across many animal species, including humans.
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Affiliation(s)
- James Rapkin
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, Cornwall, TR10 9FE, UK
| | - Kim Jensen
- Department of Bioscience, Terrestrial Ecology, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark
| | - Clarissa M House
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, Cornwall, TR10 9FE, UK.,School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia.,Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bay 1797, Penrith, NSW, 2751, Australia
| | - Alastair J Wilson
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, Cornwall, TR10 9FE, UK
| | - John Hunt
- Centre for Ecology and Conservation, University of Exeter, Cornwall Campus, Penryn, Cornwall, TR10 9FE, UK. .,School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia. .,Hawkesbury Institute for the Environment, University of Western Sydney, Locked Bay 1797, Penrith, NSW, 2751, Australia.
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13
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Mukhopadhyay A, Dwarkanath P, Bhanji S, Devi S, Thomas A, Kurpad AV, Thomas T. Maternal intake of milk and milk proteins is positively associated with birth weight: A prospective observational cohort study. Clin Nutr ESPEN 2018; 25:103-109. [PMID: 29779803 DOI: 10.1016/j.clnesp.2018.03.125] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 12/19/2017] [Accepted: 03/17/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND A striking number of low birth weight (LBW) Indian babies are born annually. Previous studies have confirmed the positive association between milk intake and birth weight. However, the relations between protein and vitamin B12 from milk and birth weight have not been systematically explored. AIMS We examined the relations between birth weight and maternal intake of milk, protein from milk and vitamin B12 from milk. METHODS This prospective, observational cohort study was conducted in an urban South Indian hospital. The dietary intakes of milk and milk products were assessed using validated food frequency questionnaire and at delivery birth outcomes were measured. The relations between milk products, milk protein, and vitamin B12 from milk with birth weight and gestational weight gain were assessed in 2036 births with first trimester dietary and delivery data. RESULTS Median consumption of milk products in the first trimester was 310 g·day-1 and average birth weight was 2876 g. Birth weight was positively associated with intake of milk products and of % protein from milk products (%milk protein) in the first trimester [β = 86.8, 95% confidence interval (CI): 29.1, 144.6; β = 63.1, 95% CI: 10.8, 115.5; P < 0.001 for both]. Intake of milk products and of %milk protein in the third trimester was positively associated with gestational weight gain (GWG) between the second and third trimester (One-way ANOVA, P < 0.001 and = 0.001, respectively). Neither birth weight nor GWG were associated with %vitamin B12 from milk products. CONCLUSIONS These findings indicate that intake of milk products in the first trimester and especially, protein from milk products is positively associated with birth weight in this South Asian Indian population.
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Affiliation(s)
- A Mukhopadhyay
- Division of Nutrition, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, 560034, India.
| | - P Dwarkanath
- Division of Nutrition, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, 560034, India
| | - S Bhanji
- Harvard Business School, Boston, MA, 02163, USA
| | - S Devi
- Division of Nutrition, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, 560034, India
| | - A Thomas
- Department of Obstetrics and Gynaecology, St. John's National Academy of Health Sciences, Bangalore, 560034, India
| | - A V Kurpad
- Division of Nutrition, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, 560034, India
| | - T Thomas
- Division of Epidemiology and Biostatistics, St. John's Research Institute, St. John's National Academy of Health Sciences, Bangalore, 560034, India
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14
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Coogan SCP, Raubenheimer D, Zantis SP, Machovsky‐Capuska GE. Multidimensional nutritional ecology and urban birds. Ecosphere 2018. [DOI: 10.1002/ecs2.2177] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Sean C. P. Coogan
- School of Life and Environmental Sciences and the Charles Perkins Centre University of Sydney Sydney NSW 2006 Australia
- Department of Renewable Resources University of Alberta Edmonton Alberta T6G 2H1 Canada
| | - David Raubenheimer
- School of Life and Environmental Sciences and the Charles Perkins Centre University of Sydney Sydney NSW 2006 Australia
| | - Simon P. Zantis
- School of Life and Environmental Sciences and the Charles Perkins Centre University of Sydney Sydney NSW 2006 Australia
| | - Gabriel E. Machovsky‐Capuska
- School of Life and Environmental Sciences and the Charles Perkins Centre University of Sydney Sydney NSW 2006 Australia
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Wexler Y, Scharf I. Distinct effects of two separately applied stressors on behavior in the red flour beetle. Behav Processes 2017; 145:86-92. [DOI: 10.1016/j.beproc.2017.10.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 10/16/2017] [Accepted: 10/17/2017] [Indexed: 02/06/2023]
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Abstract
AbstractOut-of-home foods (takeaway, take-out and fast foods) have become increasingly popular in recent decades and are thought to be a key driver in increasing levels of overweight and obesity due to their unfavourable nutritional content. Individual food choices and eating behaviours are influenced by many interrelated factors which affect the results of nutrition-related public health interventions. While the majority of research based on out-of-home foods comes from Australia, the UK and USA, the same issues (poor dietary habits and increased prevalence of non-communicable disease) are of equal concern for urban centres in developing economies undergoing ‘nutrition transition’ at a global scale. The present narrative review documents key facets, which may influence out-of-home food consumption, drawn from biological, societal, environmental, demographic and psychological spheres. Literature searches were performed and references from relevant papers were used to find supplementary studies. Findings suggest that the strongest determinants of out-of-home food availability are density of food outlets and deprivation within the built environment; however, the association between socio-economic status and out-of-home food consumption has been challenged. In addition, the biological and psychological drives combined with a culture where overweight and obesity are becoming the norm makes it ‘fashionable’ to consume out-of-home food. Other factors, including age group, ethnicity and gender demonstrate contrasting effects and a lack of consensus. It is concluded that further consideration of the determinants of out-of-home food consumption within specific populations is crucial to inform the development of targeted interventions to reduce the impact of out-of-home foods on public health.
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Abstract
OBJECTIVE Experimental studies have shown that human macronutrient regulation minimizes variation in absolute protein intake and consequently energy intake varies passively with dietary protein density ('protein leverage'). According to the 'protein leverage hypothesis' (PLH), protein leverage interacts with a reduction in dietary protein density to drive energy overconsumption and obesity. Worldwide increase in consumption of ultra-processed foods (UPF) has been hypothesized to be an important determinant of dietary protein dilution, and consequently an ecological driving force of energy overconsumption and the obesity pandemic. The present study examined the relationships between dietary contribution of UPF, dietary proportional protein content and the absolute intakes of protein and energy. DESIGN National representative cross-sectional study. SETTING National Health and Nutrition Examination Survey 2009-2010. SUBJECTS Participants (n 9042) aged ≥2 years with at least one day of 24 h dietary recall data. RESULTS We found a strong inverse relationship between consumption of UPF and dietary protein density, with mean protein content dropping from 18·2 to 13·3 % between the lowest and highest quintiles of dietary contribution of UPF. Consistent with the PLH, increase in the dietary contribution of UPF (previously shown to be inversely associated with protein density) was also associated with a rise in total energy intake, while absolute protein intake remained relatively constant. CONCLUSIONS The protein-diluting effect of UPF might be one mechanism accounting for their association with excess energy intake. Reducing UPF contribution in the US diet may be an effective way to increase its dietary protein concentration and prevent excessive energy intake.
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Diet quality and its implications on the cardio-metabolic, physical and general health of older men: the Concord Health and Ageing in Men Project (CHAMP). Br J Nutr 2017; 118:130-143. [PMID: 28820080 DOI: 10.1017/s0007114517001738] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The revised Dietary Guideline Index (DGI-2013) scores individuals' diets according to their compliance with the Australian Dietary Guideline (ADG). This cross-sectional study assesses the diet quality of 794 community-dwelling men aged 74 years and older, living in Sydney, Australia participating in the Concord Health and Ageing in Men Project; it also examines sociodemographic and lifestyle factors associated with DGI-2013 scores; it studies associations between DGI-2103 scores and the following measures: homoeostasis model assessment - insulin resistance, LDL-cholesterol, HDL-cholesterol, TAG, blood pressure, waist:hip ratio, BMI, number of co-morbidities and medications and frailty status while also accounting for the effect of ethnicity in these relationships. Median DGI-2013 score was 93·7 (54·4, 121·2); most individuals failed to meet recommendations for vegetables, dairy products and alternatives, added sugar, unsaturated fat and SFA, fluid and discretionary foods. Lower education, income, physical activity levels and smoking were associated with low scores. After adjustments for confounders, high DGI-2013 scores were associated with lower HDL-cholesterol, lower waist:hip ratios and lower probability of being frail. Proxies of good health (fewer co-morbidities and medications) were not associated with better compliance to the ADG. However, in participants with a Mediterranean background, low DGI-2013 scores were not generally associated with poorer health. Older men demonstrated poor diet quality as assessed by the DGI-2013, and the association between dietary guidelines and health measures and indices may be influenced by ethnic background.
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Schwartz MW, Seeley RJ, Zeltser LM, Drewnowski A, Ravussin E, Redman LM, Leibel RL. Obesity Pathogenesis: An Endocrine Society Scientific Statement. Endocr Rev 2017; 38:267-296. [PMID: 28898979 PMCID: PMC5546881 DOI: 10.1210/er.2017-00111] [Citation(s) in RCA: 364] [Impact Index Per Article: 52.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 05/12/2017] [Indexed: 02/07/2023]
Abstract
Obesity is among the most common and costly chronic disorders worldwide. Estimates suggest that in the United States obesity affects one-third of adults, accounts for up to one-third of total mortality, is concentrated among lower income groups, and increasingly affects children as well as adults. A lack of effective options for long-term weight reduction magnifies the enormity of this problem; individuals who successfully complete behavioral and dietary weight-loss programs eventually regain most of the lost weight. We included evidence from basic science, clinical, and epidemiological literature to assess current knowledge regarding mechanisms underlying excess body-fat accumulation, the biological defense of excess fat mass, and the tendency for lost weight to be regained. A major area of emphasis is the science of energy homeostasis, the biological process that maintains weight stability by actively matching energy intake to energy expenditure over time. Growing evidence suggests that obesity is a disorder of the energy homeostasis system, rather than simply arising from the passive accumulation of excess weight. We need to elucidate the mechanisms underlying this "upward setting" or "resetting" of the defended level of body-fat mass, whether inherited or acquired. The ongoing study of how genetic, developmental, and environmental forces affect the energy homeostasis system will help us better understand these mechanisms and are therefore a major focus of this statement. The scientific goal is to elucidate obesity pathogenesis so as to better inform treatment, public policy, advocacy, and awareness of obesity in ways that ultimately diminish its public health and economic consequences.
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Affiliation(s)
| | - Randy J Seeley
- Department of Surgery, University of Michigan, Ann Arbor, Michigan 48109
| | - Lori M Zeltser
- Naomi Berrie Diabetes Center and Department of Pathology and Cell Biology, Columbia University, New York, New York 10032
| | - Adam Drewnowski
- Center for Public Health Nutrition, University of Washington, Seattle, Washington 98195
| | - Eric Ravussin
- John S. McIlhenny Skeletal Muscle Physiology Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Leanne M Redman
- John S. McIlhenny Skeletal Muscle Physiology Laboratory, Pennington Biomedical Research Center, Baton Rouge, Louisiana 70808
| | - Rudolph L Leibel
- Naomi Berrie Diabetes Center and Department of Pathology and Cell Biology, Columbia University, New York, New York 10032.,Division of Molecular Genetics, Department of Pediatrics, Columbia University, New York, New York 10032
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Ochoa Gautier JB, Martindale RG, Rugeles SJ, Hurt RT, Taylor B, Heyland DK, McClave SA. How Much and What Type of Protein Should a Critically Ill Patient Receive? Nutr Clin Pract 2017; 32:6S-14S. [PMID: 28388376 DOI: 10.1177/0884533617693609] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Protein loss, manifested as loss of muscle mass, is observed universally in all critically ill patients. Depletion of muscle mass is associated with impaired function and poor outcomes. In extreme cases, protein malnutrition is manifested by respiratory failure, lack of wound healing, and immune dysfunction. Protecting muscle loss focused initially on meeting energy requirements. The assumption was that protein was being used (through oxidation) as an energy source. In healthy individuals, small amounts of glucose (approximately 400 calories) protect muscle loss and decrease amino acid oxidation (protein-sparing effect of glucose). Despite expectations of the benefits, the high provision of energy (above basal energy requirements) through the delivery of nonprotein calories has failed to demonstrate a clear benefit at curtailing protein loss. The protein-sparing effect of glucose is not clearly observed during illness. Increasing protein delivery beyond the normal nutrition requirements (0.8 g/k/d) has been investigated as an alternative solution. Over a dozen observational studies in critically ill patients suggest that higher protein delivery is beneficial at protecting muscle mass and associated with improved outcomes (decrease in mortality). Not surprisingly, new Society of Critical Care Medicine/American Society for Parenteral and Enteral Nutrition guidelines and expert recommendations suggest higher protein delivery (>1.2 g/kg/d) for critically ill patients. This article provides an introduction to the concepts that delineate the basic principles of modern medical nutrition therapy as it relates to the goal of achieving an optimal management of protein metabolism during critical care illness, highlighting successes achieved so far but also placing significant challenges limiting our success in perspective.
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Affiliation(s)
| | - Robert G Martindale
- 2 Department of Surgery, Oregon Health and Science University, Portland, Oregon, USA
| | - Saúl J Rugeles
- 3 Department of Surgery, Pontificia Universidad Javeriana, Bogota, DC, Colombia
| | - Ryan T Hurt
- 4 Department of Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Beth Taylor
- 5 Department of Food and Nutrition, Barnes-Jewish Hospital, St Louis, Missouri, USA
| | - Daren K Heyland
- 6 Department of Medicine, Queens University, Kingston, Ontario, Canada
| | - Stephen A McClave
- 7 Department of Medicine, University of Louisville, Louisville, Kentucky, USA
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Bekelman TA, Santamaría‐Ulloa C, Dufour DL, Marín‐Arias L, Dengo AL. Using the protein leverage hypothesis to understand socioeconomic variation in obesity. Am J Hum Biol 2017; 29. [DOI: 10.1002/ajhb.22953] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 10/27/2016] [Accepted: 12/11/2016] [Indexed: 01/28/2023] Open
Affiliation(s)
- Traci A. Bekelman
- Department of Pediatrics/Section of NutritionUniversity of Colorado Anschutz Medical CampusAurora Colorado80045
| | - Carolina Santamaría‐Ulloa
- Instituto de Investigaciones en Salud (INISA), Universidad de Costa RicaSan José Costa Rica
- Escuela de Nutrición, Universidad de Costa RicaSan José Costa Rica
| | - Darna L. Dufour
- Department of AnthropologyUniversity of Colorado BoulderBoulder Colorado80309
| | - Lilliam Marín‐Arias
- Instituto de Investigaciones en Salud (INISA), Universidad de Costa RicaSan José Costa Rica
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Fluctuations in money availability within an income cycle impacts diet quality of remote Indigenous Australians. Public Health Nutr 2017; 20:1431-1440. [PMID: 28069086 DOI: 10.1017/s1368980016003360] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To consider the plausible nutritional impacts of fluctuations in money availability within an income cycle for remote Indigenous Australians. DESIGN Community-level dietary intake (energy, micro/macronutrients) and expenditure on foods and beverages (F&B) were estimated over one year for three remote Indigenous Australian communities (Northern Territory, Australia) using monthly F&B transaction data. F&B that were likely to be consumed during a period within an income cycle when money was relatively limited (low money period (LMP) foods) were identified by panel consensus and scenario modelling was conducted to simulate the nutritional outcomes of a range of F&B selection responses to having an LMP. RESULTS All scenarios resulted in reduced diet quality during the LMP relative to overall average diet values. Protein and fat energy percentages were reduced and carbohydrate energy percentage increased. Despite reduced expenditure, declines in energy intake were typically buffered due to the reduced energy cost ($AU/MJ) of the LMP diet. The micronutrient profile of the LMP diet was substantially poorer, such that additional key micronutrients dropped below population-weighted Estimated Average Requirements/Adequate Intakes. CONCLUSIONS The modelling undertaken herein suggests that even a short period of low money within an income cycle may noticeably contribute to the reduced diet quality of remote Indigenous Australians and exacerbate lifestyle disease risk. Dietary strategies that are designed to respond to diets and expenditure during different income cycle periods, rather than the overall average diet and expenditure, should be considered for improving diet quality and reducing cardiometabolic disease risk in remote Indigenous Australians.
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Affiliation(s)
- David Raubenheimer
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales 2006, Australia;
| | - Stephen J. Simpson
- Charles Perkins Centre and School of Life and Environmental Sciences, The University of Sydney, Sydney, New South Wales 2006, Australia;
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Campbell CP, Raubenheimer D, Badaloo AV, Gluckman PD, Martinez C, Gosby A, Simpson SJ, Osmond C, Boyne MS, Forrester TE. Developmental contributions to macronutrient selection: a randomized controlled trial in adult survivors of malnutrition. EVOLUTION MEDICINE AND PUBLIC HEALTH 2016; 2016:158-69. [PMID: 26817484 PMCID: PMC4871598 DOI: 10.1093/emph/eov030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 10/14/2015] [Indexed: 11/13/2022]
Abstract
Background and objectives: Birthweight differences between kwashiorkor and marasmus suggest that intrauterine factors influence the development of these syndromes of malnutrition and may modulate risk of obesity through dietary intake. We tested the hypotheses that the target protein intake in adulthood is associated with birthweight, and that protein leveraging to maintain this target protein intake would influence energy intake (EI) and body weight in adult survivors of malnutrition. Methodology: Sixty-three adult survivors of marasmus and kwashiorkor could freely compose a diet from foods containing 10, 15 and 25 percentage energy from protein (percentage of energy derived from protein (PEP); Phase 1) for 3 days. Participants were then randomized in Phase 2 (5 days) to diets with PEP fixed at 10%, 15% or 25%. Results: Self-selected PEP was similar in both groups. In the groups combined, selected PEP was 14.7, which differed significantly (P < 0.0001) from the null expectation (16.7%) of no selection. Self-selected PEP was inversely related to birthweight, the effect disappearing after adjusting for sex and current body weight. In Phase 2, PEP correlated inversely with EI (P = 0.002) and weight change from Phase 1 to 2 (P = 0.002). Protein intake increased with increasing PEP, but to a lesser extent than energy increased with decreasing PEP. Conclusions and implications: Macronutrient intakes were not independently related to birthweight or diagnosis. In a free-choice situation (Phase 1), subjects selected a dietary PEP significantly lower than random. Lower PEP diets induce increased energy and decreased protein intake, and are associated with weight gain.
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Affiliation(s)
- Claudia P Campbell
- UWI Solutions for Developing Countries, University of the West Indies, Mona, Kingston, Jamaica
| | - David Raubenheimer
- Liggins Institute and National Research Centre for Growth and Development, University of Auckland, Auckland, New Zealand Charles Perkins Centre and School of Biological Sciences, The University of Sydney, Sydney, NSW, Australia Faculty of Veterinary Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Asha V Badaloo
- Tropical Medicine Research Institute, University of the West Indies, Mona, Kingston, Jamaica
| | - Peter D Gluckman
- Liggins Institute and National Research Centre for Growth and Development, University of Auckland, Auckland, New Zealand
| | - Claudia Martinez
- Liggins Institute and National Research Centre for Growth and Development, University of Auckland, Auckland, New Zealand
| | - Alison Gosby
- Charles Perkins Centre and School of Biological Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Stephen J Simpson
- Charles Perkins Centre and School of Biological Sciences, The University of Sydney, Sydney, NSW, Australia
| | - Clive Osmond
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
| | - Michael S Boyne
- Tropical Medicine Research Institute, University of the West Indies, Mona, Kingston, Jamaica
| | - Terrence E Forrester
- UWI Solutions for Developing Countries, University of the West Indies, Mona, Kingston, Jamaica
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25
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Coogan SCP, Raubenheimer D. Might macronutrient requirements influence grizzly bear–human conflict? Insights from nutritional geometry. Ecosphere 2016. [DOI: 10.1002/ecs2.1204] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Affiliation(s)
- Sean C. P. Coogan
- Charles Perkins Centre School of Biological Sciences University of Sydney Level 4 East Building D17 Sydney New South Wales 2006 Australia
| | - David Raubenheimer
- Faculty of Veterinary Science Charles Perkins Centre School of Biological Sciences University of Sydney Level 4 East Building D17 Sydney New South Wales 2006 Australia
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Functional food relevance of whey protein: A review of recent findings and scopes ahead. J Funct Foods 2015. [DOI: 10.1016/j.jff.2015.09.040] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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Vega-López S, Pignotti GAP, Todd M, Keller C. Egg Intake and Dietary Quality among Overweight and Obese Mexican-American Postpartum Women. Nutrients 2015; 7:8402-12. [PMID: 26445060 PMCID: PMC4632422 DOI: 10.3390/nu7105402] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/14/2015] [Accepted: 09/22/2015] [Indexed: 01/13/2023] Open
Abstract
Despite their low cost and high nutrient density, the contribution of eggs to nutrient intake and dietary quality among Mexican-American postpartum women has not been evaluated. Nutrient intake and dietary quality, as assessed by the Healthy Eating Index 2010 (HEI-2010), were measured in habitually sedentary overweight/obese (body mass index (BMI) = 29.7 ± 3.5 kg/m²) Mexican-American postpartum women (28 ± 6 years) and compared between egg consumers (n = 82; any egg intake reported in at least one of three 24-h dietary recalls) and non-consumers (n = 57). Egg consumers had greater intake of energy (+808 kJ (193 kcal) or 14%; p = 0.033), protein (+9 g or 17%; p = 0.031), total fat (+9 g or 19%; p = 0.039), monounsaturated fat (+4 g or 24%; p = 0.020), and several micronutrients than non-consumers. Regarding HEI-2010 scores, egg consumers had a greater total protein foods score than non-consumers (4.7 ± 0.7 vs. 4.3 ± 1.0; p = 0.004), and trends for greater total fruit (2.4 ± 1.8 vs. 1.9 ± 1.7; p = 0.070) and the total composite HEI-2010 score (56.4 ± 12.6 vs. 52.3 ± 14.4; p = 0.082). Findings suggest that egg intake could contribute to greater nutrient intake and improved dietary quality among postpartum Mexican-American women. Because of greater energy intake among egg consumers, recommendations for overweight/obese individuals should include avoiding excessive energy intake and incorporating eggs to a nutrient-dense, fiber-rich dietary pattern.
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Affiliation(s)
- Sonia Vega-López
- School of Nutrition and Health Promotion, Arizona State University, 500 North 3rd Street, Phoenix, AZ 85004, USA.
- Southwestern Interdisciplinary Research Center, Arizona State University, 411 North Central Avenue, Suite #720, Phoenix, AZ 85004, USA.
| | - Giselle A P Pignotti
- Department of Nutrition, Food Science and Packaging, San Jose State University, One Washington Square, San Jose, CA 95192-0058, USA.
| | - Michael Todd
- College of Nursing and Health Innovation, Arizona State University, 500 North 3rd Street, Phoenix, AZ 85004, USA.
| | - Colleen Keller
- Southwestern Interdisciplinary Research Center, Arizona State University, 411 North Central Avenue, Suite #720, Phoenix, AZ 85004, USA.
- College of Nursing and Health Innovation, Arizona State University, 500 North 3rd Street, Phoenix, AZ 85004, USA.
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Cease AJ, Capps KA, Gates KK, McCrackin ML, Nidzgorski DA. Consumer-driven nutrient dynamics in urban environments: the stoichiometry of human diets and waste management. OIKOS 2015. [DOI: 10.1111/oik.02391] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Arianne J. Cease
- School of Sustainability, Arizona State Univ.; Tempe, AZ 85287 USA
| | - Krista A. Capps
- Dept of Wildlife, Fisheries and Conservation Biology; Univ. of Maine; Orono, ME 04473 USA
| | - Kiza K. Gates
- Oklahoma Biological Survey and the Univ. of Oklahoma; Norman, OK 73019 USA
| | | | - Daniel A. Nidzgorski
- Dept of Ecology, Evolution and Behavior; Univ. of Minnesota; Saint Paul MN 55108 USA
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Abstract
We apply nutritional geometry, a framework for modelling the interactive effects of nutrients on animals, to help understand the role of modern environments in the obesity pandemic. Evidence suggests that humans regulate the intake of protein energy (PE) more strongly than non-protein energy (nPE), and consequently will over- and under-ingest nPE on diets with low or high PE, respectively. This pattern of macronutrient regulation has led to the protein leverage hypothesis, which proposes that the rise in obesity has been caused partly by a shift towards diets with reduced PE:nPE ratios relative to the set point for protein regulation. We discuss potential causes of this mismatch, including environmentally induced reductions in the protein density of the human diet and factors that might increase the regulatory set point for protein and hence exacerbate protein leverage. Economics--the high price of protein compared with fats and carbohydrates--is one factor that might contribute to the reduction of dietary protein concentrations. The possibility that rising atmospheric CO₂ levels could also play a role through reducing the PE:nPE ratios in plants and animals in the human food chain is discussed. Factors that reduce protein efficiency, for example by increasing the use of ingested amino acids in energy metabolism (hepatic gluconeogenesis), are highlighted as potential drivers of increased set points for protein regulation. We recommend that a similar approach is taken to understand the rise of obesity in other species, and identify some key gaps in the understanding of nutrient regulation in companion animals.
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Logan AC, Jacka FN. Nutritional psychiatry research: an emerging discipline and its intersection with global urbanization, environmental challenges and the evolutionary mismatch. J Physiol Anthropol 2014; 33:22. [PMID: 25060574 PMCID: PMC4131231 DOI: 10.1186/1880-6805-33-22] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 07/02/2014] [Indexed: 12/14/2022] Open
Abstract
In 21st-century public health, rapid urbanization and mental health disorders are a growing global concern. The relationship between diet, brain function and the risk of mental disorders has been the subject of intense research in recent years. In this review, we examine some of the potential socioeconomic and environmental challenges detracting from the traditional dietary patterns that might otherwise support positive mental health. In the context of urban expansion, climate change, cultural and technological changes and the global industrialization and ultraprocessing of food, findings related to nutrition and mental health are connected to some of the most pressing issues of our time. The research is also of relevance to matters of biophysiological anthropology. We explore some aspects of a potential evolutionary mismatch between our ancestral past (Paleolithic, Neolithic) and the contemporary nutritional environment. Changes related to dietary acid load, advanced glycation end products and microbiota (via dietary choices and cooking practices) may be of relevance to depression, anxiety and other mental disorders. In particular, the results of emerging studies demonstrate the importance of prenatal and early childhood dietary practices within the developmental origins of health and disease concept. There is still much work to be done before these population studies and their mirrored advances in bench research can provide translation to clinical medicine and public health policy. However, the clear message is that in the midst of a looming global epidemic, we ignore nutrition at our peril.
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Affiliation(s)
- Alan C Logan
- CAMNR, 23679 Calabasas Road Suite 542, Calabasas, CA 91302, USA
| | - Felice N Jacka
- School of Medicine, Deakin University, IMPACT SRC, PO Box 281, Geelong, VIC 3220, Australia
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Abstract
AbstractObjectiveAn important debate in the literature is whether or not higher energy-dense foods are cheaper than less energy-dense foods. The present communication develops and applies an easy statistical test to determine if the relationship between food price and energy density is an artifact of how the data units are constructed (i.e. is it ‘spurious’ or ‘real’?).DesignAfter matching data on 4430 different foods from the National Health and Nutrition Examination Survey with corresponding prices from the Center for Nutrition Policy and Promotion’s Food Prices Database, we use a simple regression model to test if the relationship between food price and energy density is ‘real’ or ‘spurious’.SettingUSA.SubjectsTotal sample size is 4430 observations of consumed foods from 4578 participants from the non-institutionalized US adult population (aged 19 years and over).ResultsOver all 4430 foods, the null hypothesis of a spurious inverse relationship between food price per energy density and energy density is not rejected. When the analysis is broken down by twenty-five food groups, there are only two cases where the inverse relationship is not spurious. In fact, the majority of non-spurious relationships between food price and energy density are positive, not negative.ConclusionsOne of the main arguments put forth regarding the poor diet quality of low-income households is that high energy-dense food is cheaper than lower energy-dense food. We find almost no statistical support for higher energy-dense food being cheaper than low energy-dense food. While economics certainly plays a role in explaining low nutritional quality, more sophisticated economic arguments are required and discussed.
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Raubenheimer D, Rothman JM, Pontzer H, Simpson SJ. Macronutrient contributions of insects to the diets of hunter-gatherers: a geometric analysis. J Hum Evol 2014; 71:70-6. [PMID: 24630913 DOI: 10.1016/j.jhevol.2014.02.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Revised: 10/31/2013] [Accepted: 02/16/2014] [Indexed: 11/15/2022]
Abstract
We present a geometric model for examining the macronutrient contributions of insects in the diets of pre-agricultural humans, and relate the findings to some contemporary societies that regularly eat insects. The model integrates published data on the macronutrient composition of insects and other foods in the diets of humans, recommended human macronutrient intakes, and estimated macronutrient intakes to examine the assumption that insects provided to pre-agricultural humans an invertebrate equivalent of vertebrate-derived meats, serving primarily as a source of protein. Our analysis suggests that insects vary more widely in their macronutrient content than is likely to be the case for most wild vertebrate meats, spanning a broad range of protein, fat and carbohydrate concentrations. Potentially, therefore, in terms of their proportional macronutrient composition, insects could serve as equivalents not only of wild meat, but of a range of other foods including some shellfish, nuts, pulses, vegetables and even fruits. Furthermore, humans might systematically manipulate the composition of edible insects to meet specific needs through pre-ingestive processing, such as cooking and selective removal of body parts. We present data suggesting that in modern societies for which protein is the more limiting macronutrient, pre-ingestive processing of edible insects might serve to concentrate protein. It is likely, however, that the dietary significance of insects was different for Paleolithic hunter-gatherers who were more limited in non-protein energy. Our conclusions are constrained by available data, but highlight the need for further studies, and suggest that our model provides an integrative framework for conceiving these studies.
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Affiliation(s)
- David Raubenheimer
- Charles Perkins Centre and Faculty of Veterinary Science and School of Biological Sciences, University of Sydney, Sydney, Australia.
| | - Jessica M Rothman
- Department of Anthropology, Hunter College of the City University of New York, New York, USA; New York Consortium in Evolutionary Primatology, New York, USA
| | - Herman Pontzer
- Department of Anthropology, Hunter College of the City University of New York, New York, USA; New York Consortium in Evolutionary Primatology, New York, USA
| | - Stephen J Simpson
- School of Biological Sciences and the Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
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Gosby AK, Conigrave AD, Raubenheimer D, Simpson SJ. Protein leverage and energy intake. Obes Rev 2014; 15:183-91. [PMID: 24588967 DOI: 10.1111/obr.12131] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 09/13/2013] [Accepted: 09/29/2013] [Indexed: 12/01/2022]
Abstract
Increased energy intakes are contributing to overweight and obesity. Growing evidence supports the role of protein appetite in driving excess intake when dietary protein is diluted (the protein leverage hypothesis). Understanding the interactions between dietary macronutrient balance and nutrient-specific appetite systems will be required for designing dietary interventions that work with, rather than against, basic regulatory physiology. Data were collected from 38 published experimental trials measuring ad libitum intake in subjects confined to menus differing in macronutrient composition. Collectively, these trials encompassed considerable variation in percent protein (spanning 8-54% of total energy), carbohydrate (1.6-72%) and fat (11-66%). The data provide an opportunity to describe the individual and interactive effects of dietary protein, carbohydrate and fat on the control of total energy intake. Percent dietary protein was negatively associated with total energy intake (F = 6.9, P < 0.0001) irrespective of whether carbohydrate (F = 0, P = 0.7) or fat (F = 0, P = 0.5) were the diluents of protein. The analysis strongly supports a role for protein leverage in lean, overweight and obese humans. A better appreciation of the targets and regulatory priorities for protein, carbohydrate and fat intake will inform the design of effective and health-promoting weight loss diets, food labelling policies, food production systems and regulatory frameworks.
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Affiliation(s)
- A K Gosby
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia; School of Biological Sciences, University of Sydney, Sydney, New South Wales, Australia
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Martinez-Cordero C, Kuzawa CW, Sloboda DM, Stewart J, Simpson SJ, Raubenheimer D. Testing the Protein Leverage Hypothesis in a free-living human population. Appetite 2012; 59:312-5. [DOI: 10.1016/j.appet.2012.05.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 05/08/2012] [Accepted: 05/15/2012] [Indexed: 10/28/2022]
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Heitmann BL, Westerterp KR, Loos RJF, Sørensen TIA, O'Dea K, McLean P, Jensen TK, Eisenmann J, Speakman JR, Simpson SJ, Reed DR, Westerterp-Plantenga MS. Obesity: lessons from evolution and the environment. Obes Rev 2012; 13:910-22. [PMID: 22642554 DOI: 10.1111/j.1467-789x.2012.01007.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The 9th Stock Conference acknowledged the complex background of genetic, cultural, environmental and evolutionary factors of obesity. Gene-environment interactions underlie the flexibility in body-weight and body-fat regulation, illustrated by the hunter-gatherers' feast and famine lifestyle, the variation in physical activity over the lifespan being highest at reproductive age, the variation in energy intake through 'eating in the absence of hunger', while running the risk of exceeding the capacity of triacylglyceride storage, leading to lipotoxicity and metabolic problems. Perinatal metabolic programming for obesity via epigenetic changes in response to a 'Western diet' results in production of lipid-poor milk and metabolically efficient pups, contributing to the perpetuation of obesity throughout generations. Evolutionary insight from comparative physiology and ecology indicates that over generations activity-induced energy expenditure has remained the same compared to wild mammals, that energy balance might be dependant on protein balance, while the function of taste changed from detection of poison or energy to social drinking and social behaviour. At present, the impact of assortative mating on obesity prevalence is unambiguously positive. The complexity that appeared can only be fully appreciated by setting the data into the context of our evolutionary history.
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Affiliation(s)
- B L Heitmann
- Institute of Preventive Medicine, Centre for Health and Society, Copenhagen University Hospitals, Copenhagen, Denmark
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Abstract
There is considerable disagreement regarding what constitutes a healthy diet. Ever since the influential work of Cannon and Richter, it was debated whether the 'wisdom of the body' will automatically direct us to the foods we need for healthy lives or whether we must carefully learn to eat the right foods, particularly in an environment of plenty. Although it is clear that strong mechanisms have evolved to prevent consumption of foods that have previously made us sick, it is less clear whether reciprocal mechanisms exist that reinforce the consumption of healthy diets. Here, we review recent progress in providing behavioural evidence for the regulation of intake and selection of proteins, carbohydrates and fats. We examine new developments in sensory physiology enabling recognition of macronutrients both pre- and post-ingestively. Finally, we propose a general model for central neural processing of nutrient-specific appetites. We suggest that the same basic neural circuitry responsible for the homoeostatic regulation of total energy intake is also used to control consumption of specific macro- and micronutrients. Similar to salt appetite, specific appetites for other micro- and macronutrients may be encoded by unique molecular changes in the hypothalamus. Gratification of such specific appetites is then accomplished by engaging the brain motivational system to assign the highest reward prediction to exteroceptive cues previously associated with consuming the missing ingredient. A better understanding of these nutrient-specific neural processes could help design drugs and behavioural strategies that promote healthier eating.
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38
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Hruschka DJ. Do economic constraints on food choice make people fat? A critical review of two hypotheses for the poverty-obesity paradox. Am J Hum Biol 2012; 24:277-85. [PMID: 22345082 DOI: 10.1002/ajhb.22231] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 12/05/2011] [Accepted: 12/13/2011] [Indexed: 11/06/2022] Open
Abstract
In low income countries worldwide, rising standards of living have spurred an unprecedented rise in obesity. However, in numerous wealthy countries the trend frequently reverses with poorer and less educated women more likely to be overweight than their wealthier compatriots. One prominent explanation for this reverse gradient is that economic deprivation leads to food choices which paradoxically increase energy intake. If true, this would challenge current evolutionary accounts for the modern obesity epidemic and have serious implications for how policy makers tackle increasing obesity in the US and worldwide. In this article, we critically review the hypothesis that deprivation leads people to choose cheaper foods which in turn foster overconsumption of energy. Though the hypothesis is consistent with numerous cross-sectional studies, available longitudinal studies from high-, middle-, and low-income countries show the reverse-that when populations experience resource declines, they experience either declines in BMI or decelerations in BMI growth. Most notably, the recent recession in the US coincides with a clear deceleration in women's obesity across income groups. We conclude by briefly reviewing other plausible explanations for the reverse gradient among women in developing countries. Finally, we discuss how theoretical perspectives and comparative, historical approaches from human biology are useful tools for examining the current wealth of hypotheses about obesity in population health.
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Affiliation(s)
- Daniel J Hruschka
- School of Human Evolution and Social Change, Arizona State University, Tempe, 85287-2402, USA.
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Morrison CD, Reed SD, Henagan TM. Homeostatic regulation of protein intake: in search of a mechanism. Am J Physiol Regul Integr Comp Physiol 2012; 302:R917-28. [PMID: 22319049 DOI: 10.1152/ajpregu.00609.2011] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Free-living organisms must procure adequate nutrition by negotiating an environment in which both the quality and quantity of food vary markedly. Recent decades have seen marked progress in our understanding of neural regulation of feeding behavior. However, this progress has occurred largely in the context of energy intake, despite the fact that food intake is influenced by more than just the energy content of the diet. A large number of behavioral studies indicate that both the quantity and quality of dietary protein can markedly influence food intake. High-protein diets tend to reduce intake, low-protein diets tend to increase intake, and rodent models seem to self-select between diets in order to meet protein requirements and avoid diets that are imbalanced in amino acids. Recent work suggests that the amino acid leucine regulates food intake by altering mTOR and AMPK signaling in the hypothalamus, while activation of GCN2 within the anterior piriform cortex contributes to the detection and avoidance of amino acid-imbalanced diets. This review focuses on the role that these and other signaling systems may play in mediating the homeostatic regulation of protein balance, and in doing so, highlights our lack of knowledge regarding the physiological and neurobiological mechanisms that might underpin such a regulatory phenomenon.
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Purpera MN, Shen L, Taghavi M, Münzberg H, Martin RJ, Hutson SM, Morrison CD. Impaired branched chain amino acid metabolism alters feeding behavior and increases orexigenic neuropeptide expression in the hypothalamus. J Endocrinol 2012; 212:85-94. [PMID: 21969404 PMCID: PMC3350378 DOI: 10.1530/joe-11-0270] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Elevation of dietary or brain leucine appears to suppress food intake via a mechanism involving mechanistic target of rapamycin, AMPK, and/or branched chain amino acid (BCAA) metabolism. Mice bearing a deletion of mitochondrial branched chain aminotransferase (BCATm), which is expressed in peripheral tissues (muscle) and brain glia, exhibit marked increases in circulating BCAAs. Here, we test whether this increase alters feeding behavior and brain neuropeptide expression. Circulating and brain levels of BCAAs were increased two- to four-fold in BCATm-deficient mice (KO). KO mice weighed less than controls (25·9 vs 20·4 g, P<0·01), but absolute food intake was relatively unchanged. In contrast to wild-type mice, KO mice preferred a low-BCAA diet to a control diet (P<0·05) but exhibited no change in preference for low- vs high-protein (HP) diets. KO mice also exhibited low leptin levels and increased hypothalamic Npy and Agrp mRNA. Normalization of circulating leptin levels had no effect on either food preference or the increased Npy and Agrp mRNA expression. If BCAAs act as signals of protein status, one would expect reduced food intake, avoidance of dietary protein, and reduction in neuropeptide expression in BCATm-KO mice. Instead, these mice exhibit an increased expression of orexigenic neuropeptides and an avoidance of BCAAs but not HP. These data thus suggest that either BCAAs do not act as physiological signals of protein status or the loss of BCAA metabolism within brain glia impairs the detection of protein balance.
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Affiliation(s)
| | - Li Shen
- Pennington Biomedical Research Center, Baton Rouge, La 70808
| | - Marzieh Taghavi
- Department of Human Nutrition, Foods & Exercise, Virginia Polytechnic Institute, Blacksburg, Virginia 24061
| | - Heike Münzberg
- Pennington Biomedical Research Center, Baton Rouge, La 70808
| | - Roy J. Martin
- Pennington Biomedical Research Center, Baton Rouge, La 70808
| | - Susan M. Hutson
- Department of Human Nutrition, Foods & Exercise, Virginia Polytechnic Institute, Blacksburg, Virginia 24061
| | - Christopher D. Morrison
- Pennington Biomedical Research Center, Baton Rouge, La 70808
- Corresponding Author and to whom reprint requests should be addressed: Christopher D. Morrison, Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808, , 225-763-3145
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Gosby AK, Conigrave AD, Lau NS, Iglesias MA, Hall RM, Jebb SA, Brand-Miller J, Caterson ID, Raubenheimer D, Simpson SJ. Testing protein leverage in lean humans: a randomised controlled experimental study. PLoS One 2011; 6:e25929. [PMID: 22022472 PMCID: PMC3192127 DOI: 10.1371/journal.pone.0025929] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 09/13/2011] [Indexed: 11/23/2022] Open
Abstract
A significant contributor to the rising rates of human obesity is an increase in energy intake. The ‘protein leverage hypothesis’ proposes that a dominant appetite for protein in conjunction with a decline in the ratio of protein to fat and carbohydrate in the diet drives excess energy intake and could therefore promote the development of obesity. Our aim was to test the ‘protein leverage hypothesis’ in lean humans by disguising the macronutrient composition of foods offered to subjects under ad libitum feeding conditions. Energy intakes and hunger ratings were measured for 22 lean subjects studied over three 4-day periods of in-house dietary manipulation. Subjects were restricted to fixed menus in random order comprising 28 foods designed to be similar in palatability, availability, variety and sensory quality and providing 10%, 15% or 25% energy as protein. Nutrient and energy intake was calculated as the product of the amount of each food eaten and its composition. Lowering the percent protein of the diet from 15% to 10% resulted in higher (+12±4.5%, p = 0.02) total energy intake, predominantly from savoury-flavoured foods available between meals. This increased energy intake was not sufficient to maintain protein intake constant, indicating that protein leverage is incomplete. Urinary urea on the 10% and 15% protein diets did not differ statistically, nor did they differ from habitual values prior to the study. In contrast, increasing protein from 15% to 25% did not alter energy intake. On the fourth day of the trial, however, there was a greater increase in the hunger score between 1–2 h after the 10% protein breakfast versus the 25% protein breakfast (1.6±0.4 vs 25%: 0.5±0.3, p = 0.005). In our study population a change in the nutritional environment that dilutes dietary protein with carbohydrate and fat promotes overconsumption, enhancing the risk for potential weight gain.
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Affiliation(s)
- Alison K. Gosby
- School of Biological Sciences, The University of Sydney, Sydney, Australia
- * E-mail: (AKG); (SJS)
| | | | - Namson S. Lau
- Boden Institute of Obesity, Nutrition and Exercise, University of Sydney, Sydney, Australia
| | - Miguel A. Iglesias
- School of Biological Sciences, The University of Sydney, Sydney, Australia
| | - Rosemary M. Hall
- Medical Research Council, Human Nutrition Research, Cambridge, United Kingdom
| | - Susan A. Jebb
- Medical Research Council, Human Nutrition Research, Cambridge, United Kingdom
| | - Jennie Brand-Miller
- School of Molecular Bioscience, The University of Sydney, Sydney, Australia
- Boden Institute of Obesity, Nutrition and Exercise, University of Sydney, Sydney, Australia
| | - Ian D. Caterson
- School of Molecular Bioscience, The University of Sydney, Sydney, Australia
- Boden Institute of Obesity, Nutrition and Exercise, University of Sydney, Sydney, Australia
| | - David Raubenheimer
- Institute for Natural Sciences, Massey University, Auckland, New Zealand
| | - Stephen J. Simpson
- School of Biological Sciences, The University of Sydney, Sydney, Australia
- * E-mail: (AKG); (SJS)
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Metzgar M, Rideout TC, Fontes-Villalba M, Kuipers RS. The feasibility of a Paleolithic diet for low-income consumers. Nutr Res 2011; 31:444-51. [DOI: 10.1016/j.nutres.2011.05.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2010] [Revised: 05/12/2011] [Accepted: 05/14/2011] [Indexed: 01/07/2023]
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Christensen KL, Gallacher AP, Martin L, Tong D, Elgar MA. Nutrient compensatory foraging in a free-living social insect. Naturwissenschaften 2010; 97:941-4. [PMID: 20689904 DOI: 10.1007/s00114-010-0705-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2010] [Revised: 07/27/2010] [Accepted: 07/27/2010] [Indexed: 11/26/2022]
Abstract
The geometric framework model predicts that animal foraging decisions are influenced by their dietary history, with animals targeting a combination of essential nutrients through compensatory foraging. We provide experimental confirmation of nutrient-specific compensatory foraging in a natural, free-living population of social insects by supplementing their diet with sources of protein- or carbohydrate-rich food. Colonies of the ant Iridomyrmex suchieri were provided with feeders containing food rich in either carbohydrate or protein for 6 days, and were then provided with a feeder containing the same or different diet. The patterns of recruitment were consistent with the geometric framework: while feeders with a carbohydrate diet typically attracted more workers than did feeders with protein diet, the difference in recruitment between the two nutrients was smaller if the colonies had had prior access to carbohydrate than protein. Further, fewer ants visited feeders if the colony had had prior access to protein than to carbohydrates, suggesting that the larvae play a role in worker foraging behaviour.
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Affiliation(s)
- Keri L Christensen
- Department of Zoology, University of Melbourne, Melbourne, Victoria, 3010, Australia
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Brooks R, Maklakov A. Sex differences in obesity associated with total fertility rate. PLoS One 2010; 5:e10587. [PMID: 20485682 PMCID: PMC2868879 DOI: 10.1371/journal.pone.0010587] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Accepted: 04/22/2010] [Indexed: 01/26/2023] Open
Abstract
The identification of biological and ecological factors that contribute to obesity may help in combating the spreading obesity crisis. Sex differences in obesity rates are particularly poorly understood. Here we show that the strong female bias in obesity in many countries is associated with high total fertility rate, which is well known to be correlated with factors such as low average income, infant mortality and female education. We also document effects of reduced access to contraception and increased inequality of income among households on obesity rates. These results are consistent with studies that implicate reproduction as a risk factor for obesity in women and that suggest the effects of reproduction interact with socioeconomic and educational factors. We discuss our results in the light of recent research in dietary ecology and the suggestion that insulin resistance during pregnancy is due to historic adaptation to protect the developing foetus during famine. Increased access to contraception and education in countries with high total fertility rate might have the additional benefit of reducing the rates of obesity in women.
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Affiliation(s)
- Robert Brooks
- Evolution & Ecology Research Centre, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, New South Wales, Australia.
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