1
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Liu M, He L. Dietary cysteine and methionine promote peroxisome elevation and fat loss by induction of CG33474 expression in Drosophila adipose tissue. Cell Mol Life Sci 2024; 81:190. [PMID: 38649521 PMCID: PMC11035426 DOI: 10.1007/s00018-024-05226-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 03/13/2024] [Accepted: 04/03/2024] [Indexed: 04/25/2024]
Abstract
The high-protein diet (HPD) has emerged as a potent dietary approach to curb obesity. Peroxisome, a highly malleable organelle, adapts to nutritional changes to maintain homeostasis by remodeling its structure, composition, and quantity. However, the impact of HPD on peroxisomes and the underlying mechanism remains elusive. Using Drosophila melanogaster as a model system, we discovered that HPD specifically increases peroxisome levels within the adipose tissues. This HPD-induced peroxisome elevation is attributed to cysteine and methionine by triggering the expression of CG33474, a fly homolog of mammalian PEX11G. Both the overexpression of Drosophila CG33474 and human PEX11G result in increased peroxisome size. In addition, cysteine and methionine diets both reduce lipid contents, a process that depends on the presence of CG33474. Furthermore, CG33474 stimulates the breakdown of neutral lipids in a cell-autonomous manner. Moreover, the expression of CG33474 triggered by cysteine and methionine requires TOR signaling. Finally, we found that CG33474 promotes inter-organelle contacts between peroxisomes and lipid droplets (LDs), which might be a potential mechanism for CG33474-induced fat loss. In summary, our findings demonstrate that CG33474/PEX11G may serve as an essential molecular bridge linking HPD to peroxisome dynamics and lipid metabolism.
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Affiliation(s)
- Meng Liu
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China
| | - Li He
- The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230027, China.
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2
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Daniel H. Dietary proteins: from evolution to engineering. Front Nutr 2024; 11:1366174. [PMID: 38435096 PMCID: PMC10907992 DOI: 10.3389/fnut.2024.1366174] [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: 01/05/2024] [Accepted: 02/02/2024] [Indexed: 03/05/2024] Open
Abstract
Because of the indispensable amino acids dietary proteins are the most important macronutrients. Proper growth and body maintenance depends on the quantity and quality of protein intake and proteins have thus been most crucial throughout evolution with hominins living in quite diverse food ecosystems. Developments in agriculture and food science have increased availability and diversity of food including protein for a rapidly growing world population while nutrient deficiencies resulting in stunting in children for example have been reduced. Nevertheless, the developing world and growing population needs more protein of high quality - with around 400 million tons per annum estimated for 2050. In contrary, protein consumption in all developed countries exceeds meanwhile the recommended intakes considerably with consequences for health and the environment. There is a growing interest in dietary proteins driven by the quest for more sustainable diets and the increasing food demand for a growing world population. This brings new and novel sources such as algae, yeast, insects or bacteria into play in delivering the biomass but also new technologies such as precision fermentation or in vitro meat/fish or dairy. What needs to be considered when such new protein sources are explored is that proteins need to provide not only the required amino acids but also functionality in the food produced thereof. This review considers human physiology and metabolism in the context of protein intake from an evolutionary perspective and prospects on future protein production.
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Affiliation(s)
- Hannelore Daniel
- School of Life Sciences, Technical University of Munich, Freising, Germany
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3
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Zhang X, Kapoor D, Jeong SJ, Fappi A, Stitham J, Shabrish V, Sergin I, Yousif E, Rodriguez-Velez A, Yeh YS, Park A, Yurdagul A, Rom O, Epelman S, Schilling JD, Sardiello M, Diwan A, Cho J, Stitziel NO, Javaheri A, Lodhi IJ, Mittendorfer B, Razani B. Identification of a leucine-mediated threshold effect governing macrophage mTOR signalling and cardiovascular risk. Nat Metab 2024; 6:359-377. [PMID: 38409323 DOI: 10.1038/s42255-024-00984-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 01/09/2024] [Indexed: 02/28/2024]
Abstract
High protein intake is common in western societies and is often promoted as part of a healthy lifestyle; however, amino-acid-mediated mammalian target of rapamycin (mTOR) signalling in macrophages has been implicated in the pathogenesis of ischaemic cardiovascular disease. In a series of clinical studies on male and female participants ( NCT03946774 and NCT03994367 ) that involved graded amounts of protein ingestion together with detailed plasma amino acid analysis and human monocyte/macrophage experiments, we identify leucine as the key activator of mTOR signalling in macrophages. We describe a threshold effect of high protein intake and circulating leucine on monocytes/macrophages wherein only protein in excess of ∼25 g per meal induces mTOR activation and functional effects. By designing specific diets modified in protein and leucine content representative of the intake in the general population, we confirm this threshold effect in mouse models and find ingestion of protein in excess of ∼22% of dietary energy requirements drives atherosclerosis in male mice. These data demonstrate a mechanistic basis for the adverse impact of excessive dietary protein on cardiovascular risk.
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Affiliation(s)
- Xiangyu Zhang
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA
| | - Divya Kapoor
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Se-Jin Jeong
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Alan Fappi
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA
| | - Jeremiah Stitham
- Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, St Louis, MO, USA
| | - Vasavi Shabrish
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA
| | - Ismail Sergin
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Eman Yousif
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | | | - Yu-Sheng Yeh
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA
| | - Arick Park
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Arif Yurdagul
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Oren Rom
- Department of Molecular and Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Slava Epelman
- Peter Munk Cardiac Center and University Health Network, University of Toronto, Toronto, Canada
| | - Joel D Schilling
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Marco Sardiello
- Department of Pediatrics, Washington University School of Medicine, St Louis, MO, USA
| | - Abhinav Diwan
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Jaehyung Cho
- Division of Hematology, Department of Medicine, Washington University School of Medicine, St Louis, MO, USA
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA
| | - Nathan O Stitziel
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
| | - Ali Javaheri
- Cardiovascular Division, Washington University School of Medicine, St Louis, MO, USA
- John Cochran VA Medical Center, St Louis, MO, USA
| | - Irfan J Lodhi
- Division of Endocrinology, Metabolism and Lipid Research, Washington University School of Medicine, St Louis, MO, USA
| | - Bettina Mittendorfer
- Division of Nutritional Science and Obesity Medicine, Washington University School of Medicine, St. Louis, MO, USA.
- Departments of Medicine and Nutrition and Exercise Physiology, University of Missouri, Columbia, MO, USA.
| | - Babak Razani
- Department of Medicine and Vascular Medicine Institute, University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA, USA.
- Pittsburgh VA Medical Center, Pittsburgh, PA, USA.
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4
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Zandvakili I, Pulaski M, Pickett-Blakely O. A phenotypic approach to obesity treatment. Nutr Clin Pract 2023; 38:959-975. [PMID: 37277855 DOI: 10.1002/ncp.11013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 03/23/2023] [Accepted: 04/16/2023] [Indexed: 06/07/2023] Open
Abstract
Obesity is a chronic disease that increases morbidity and mortality and adversely affects quality of life. The rapid rise of obesity has outpaced the development and deployment of effective therapeutic interventions, thereby creating a global health crisis. The presentation, complications, and response to obesity treatments vary, yet lifestyle modification, which is the foundational therapeutic intervention for obesity, is often "one size fits all." The concept of personalized medicine uses genetic and phenotypic information as a guide for disease prevention, diagnosis, and treatment and has been successfully applied in diseases such as cancer, but not in obesity. As we gain insight into the pathophysiologic mechanisms of obesity and its phenotypic expression, specific pathways can be targeted to yield a greater, more sustained therapeutic impact in an individual patient with obesity. A phenotype-based pharmacologic treatment approach utilizing objective measures to classify patients into predominant obesity mechanism groups resulted in greater weight loss (compared with a non-phenotype-based approach) in a recent study by Acosta and colleagues. In this review, we discuss the application of lifestyle modifications, behavior therapy and pharmacotherapy using the obesity phenotype-based approach as a framework.
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Affiliation(s)
- Inuk Zandvakili
- Division of Digestive Diseases, Department of Internal Medicine, College of Medicine, University of Cincinnati, Cincinnati, Ohio, USA
- Division of Gastroenterology and Hepatology, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Marya Pulaski
- Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Octavia Pickett-Blakely
- Division of Gastroenterology and Hepatology, Department of Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Connolly G, Campbell WW. Poultry Consumption and Human Cardiometabolic Health-Related Outcomes: A Narrative Review. Nutrients 2023; 15:3550. [PMID: 37630747 PMCID: PMC10459134 DOI: 10.3390/nu15163550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/08/2023] [Accepted: 08/08/2023] [Indexed: 08/27/2023] Open
Abstract
Poultry meats, in particular chicken, have high rates of consumption globally. Poultry is the most consumed type of meat in the United States (US), with chicken being the most common type of poultry consumed. The amounts of chicken and total poultry consumed in the US have more than tripled over the last six decades. This narrative review describes nutritional profiles of commonly consumed chicken/poultry products, consumption trends, and dietary recommendations in the US. Overviews of the scientific literature pertaining to associations between, and effects of consuming chicken/poultry on, body weight and body composition, cardiovascular disease (CVD), and type II diabetes mellitus (T2DM) are provided. Limited evidence from randomized controlled trials indicates the consumption of lean unprocessed chicken as a primary dietary protein source has either beneficial or neutral effects on body weight and body composition and risk factors for CVD and T2DM. Apparently, zero randomized controlled feeding trials have specifically assessed the effects of consuming processed chicken/poultry on these health outcomes. Evidence from observational studies is less consistent, likely due to confounding factors such as a lack of a description of and distinctions among types of chicken/poultry products, amounts consumed, and cooking and preservation methods. New experimental and observational research on the impacts of consuming chicken/poultry, especially processed versions, on cardiometabolic health is sorely needed.
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Affiliation(s)
| | - Wayne W. Campbell
- Department of Nutrition Science, Purdue University, West Lafayette, IN 47907, USA;
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6
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Mazri FH, Manaf ZA, Shahar S, Mat Ludin AF, Karim NA. Improvement in chrono-nutrition is associated with robust weight loss outcomes: An extension of the feasibility study. Chronobiol Int 2023; 40:272-283. [PMID: 36803265 DOI: 10.1080/07420528.2023.2165092] [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: 02/22/2023]
Abstract
Previously we had demonstrated the development and feasibility of an integrated chrono-nutrition weight reduction program among non-shift workers with morning and evening chronotypes. In this current paper, we described the association between the changes in chrono-nutrition practice and weight loss outcomes upon completing the weight reduction program. A total of 91 overweight/obese non-shift workers participated in the 12-week integrated chrono-nutrition weight reduction program (Age: 39.6 ± 6.3 y; 74.7% women; BMI: 31.2 ± 4.5 kg/m2). All the assessments including anthropometry, dietary, sleep habits, physical activity, and process of change were measured during pre- and post-intervention. Participants who had lost ≥3% of their body weight were categorized as satisfactory weight loss outcome, and those who did not achieve 3% weight loss were categorized as unsatisfactory weight loss. The satisfactory weight loss had greater daily percent energy intake during earlier in the day from protein (Mean difference (MD): +3.2%, 95% CI: 1.6, 4.9, p < .001) and smaller intake from fat during later in the day (MD: -2.6%, 95% CI: -5.1, -0.1, p = .045), earlier last mealtime (MD: -49.5 min, 95% CI: -86.5, -12.6, p = .009) and midpoint of eating (MD: -27.3 min, 95% CI: -46.3, -8.2, p = .006), shorter eating window (-0.8 h, 95% CI: -1.4, -0.1, p = .031) and greater reduction in night eating syndrome score (MD: -2.4, 95% CI: -4.3, -0.5, p = .015) compared to unsatisfactory weight loss outcome. After accounting for potential confounders, the temporal pattern of energy, protein, and fat intake were associated with greater odds of achieving a satisfactory weight loss. The findings suggest a promising role of chrono-nutrition as one of the strategies in weight reduction intervention.
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Affiliation(s)
- F H Mazri
- Dietetic Program and Centre for Healthy Aging and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - Z A Manaf
- Dietetic Program and Centre for Healthy Aging and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - S Shahar
- Dietetic Program and Centre for Healthy Aging and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - A F Mat Ludin
- Biomedical Science Program and Centre for Healthy Aging and Wellness, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
| | - N A Karim
- Department of Biochemistry, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
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7
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Messina M, Duncan A, Messina V, Lynch H, Kiel J, Erdman JW. The health effects of soy: A reference guide for health professionals. Front Nutr 2022; 9:970364. [PMID: 36034914 PMCID: PMC9410752 DOI: 10.3389/fnut.2022.970364] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 07/25/2022] [Indexed: 11/22/2022] Open
Abstract
Soy is a hotly debated and widely discussed topic in the field of nutrition. However, health practitioners may be ill-equipped to counsel clients and patients about the use of soyfoods because of the enormous, and often contradictory, amount of research that has been published over the past 30 years. As interest in plant-based diets increases, there will be increased pressure for practitioners to gain a working knowledge of this area. The purpose of this review is to provide concise literature summaries (400-500 words) along with a short perspective on the current state of knowledge of a wide range of topics related to soy, from the cholesterol-lowering effects of soy protein to the impact of isoflavones on breast cancer risk. In addition to the literature summaries, general background information on soyfoods, soy protein, and isoflavones is provided. This analysis can serve as a tool for health professionals to be used when discussing soyfoods with their clients and patients.
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Affiliation(s)
- Mark Messina
- Soy Nutrition Institute Global, Washington, DC, United States
| | - Alison Duncan
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | | | - Heidi Lynch
- Kinesiology Department, Point Loma Nazarene University, San Diego, CA, United States
| | - Jessica Kiel
- Scientific and Clinical Affairs, Medifast Inc., Baltimore, MD, United States
| | - John W. Erdman
- Division of Nutritional Sciences and Beckman Institute, Department of Food Science and Human Nutrition, University of Illinois at Urbana/Champaign, Urbana, IL, United States
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8
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Johnson VR, Washington TB, Chhabria S, Wang EHC, Czepiel K, Reyes KJC, Stanford FC. Food as Medicine for Obesity Treatment and Management. Clin Ther 2022; 44:671-681. [PMID: 35618570 PMCID: PMC9908371 DOI: 10.1016/j.clinthera.2022.05.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/27/2022] [Accepted: 05/02/2022] [Indexed: 01/24/2023]
Abstract
PURPOSE Nutrition is an important lifestyle modification used in the treatment of obesity. The purpose of this review is to highlight different dietary interventions used to promote weight loss in both adults and children. METHODS A search using PubMed was performed for articles on topics related to nutrition and management and/or treatment of obesity in adults adolescents and children. The literature was reviewed and pertinent sources were used for this narrative review. DISCUSSION There are many effective nutrition interventions used to treat obesity, including altering macronutrient composition, implementing different dietary patterns, and changing meal timing. Although these interventions can induce weight loss in adults, management of obesity in children is more difficult given their varied nutrition needs in growth and development. The use of food as medicine in obesity treatment is individualized based on patient's age, food preference, and concurrent medical conditions. IMPLICATIONS Given the multifactorial etiology of obesity, treatment requires multidisciplinary care beyond nutrition intervention.
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Affiliation(s)
- Veronica R. Johnson
- Division of General Internal Medicine, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Tiffani Bell Washington
- Harvard T.H. Chan School of Public Health, Department of Health Policy and Management, Boston, MA, USA
| | | | | | - Kathryn Czepiel
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Stanford University, Palo Alto, CA, USA
| | - Karen J. Campoverde Reyes
- Liver Center, Division of Gastroenterology and Hepatology, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA
| | - Fatima Cody Stanford
- Department of Medicine-Neuroendocrine Unit, Pediatric Endocrinology, MGH Weight Center, Nutrition Obesity Research Center at Harvard, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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Lim JJ, Liu Y, Lu LW, Barnett D, Sequeira IR, Poppitt SD. Does a Higher Protein Diet Promote Satiety and Weight Loss Independent of Carbohydrate Content? An 8-Week Low-Energy Diet (LED) Intervention. Nutrients 2022; 14:nu14030538. [PMID: 35276894 PMCID: PMC8838013 DOI: 10.3390/nu14030538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Revised: 01/22/2022] [Accepted: 01/25/2022] [Indexed: 11/18/2022] Open
Abstract
Both higher protein (HP) and lower carbohydrate (LC) diets may promote satiety and enhance body weight (BW) loss. This study investigated whether HP can promote these outcomes independent of carbohydrate (CHO) content. 121 women with obesity (BW: 95.1 ± 13.0 kg, BMI: 35.4 ± 3.9 kg/m2) were randomised to either HP (1.2 g/kg BW) or normal protein (NP, 0.8 g/kg BW) diets, in combination with either LC (28 en%) or normal CHO (NC, 40 en%) diets. A low-energy diet partial diet replacement (LEDpdr) regime was used for 8 weeks, where participants consumed fixed-energy meal replacements plus one ad libitum meal daily. Four-day dietary records showed that daily energy intake (EI) was similar between groups (p = 0.744), but the difference in protein and CHO between groups was lower than expected. Following multiple imputation (completion rate 77%), decrease in mean BW, fat mass (FM) and fat-free mass (FFM) at Week 8 in all was 7.5 ± 0.7 kg (p < 0.001), 5.7 ± 0.5 kg (p < 0.001), and 1.4 ± 0.7 kg (p = 0.054) respectively, but with no significant difference between diet groups. LC (CHO×Week, p < 0.05), but not HP, significantly promoted postprandial satiety during a preload challenge. Improvements in blood biomarkers were unrelated to LEDpdr macronutrient composition. In conclusion, HP did not promote satiety and BW loss compared to NP LEDpdr, irrespective of CHO content.
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Affiliation(s)
- Jia Jiet Lim
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland 1024, New Zealand; (Y.L.); (L.W.L.); (I.R.S.); (S.D.P.)
- Riddet Institute, Palmerston North 4474, New Zealand
- Correspondence:
| | - Yutong Liu
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland 1024, New Zealand; (Y.L.); (L.W.L.); (I.R.S.); (S.D.P.)
- Department of Medicine, University of Auckland, Auckland 1010, New Zealand
| | - Louise Weiwei Lu
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland 1024, New Zealand; (Y.L.); (L.W.L.); (I.R.S.); (S.D.P.)
- High-Value Nutrition National Science Challenge, Auckland 1023, New Zealand
| | - Daniel Barnett
- Department of Statistics, University of Auckland, Auckland 1010, New Zealand;
| | - Ivana R. Sequeira
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland 1024, New Zealand; (Y.L.); (L.W.L.); (I.R.S.); (S.D.P.)
- High-Value Nutrition National Science Challenge, Auckland 1023, New Zealand
| | - Sally D. Poppitt
- Human Nutrition Unit, School of Biological Sciences, University of Auckland, Auckland 1024, New Zealand; (Y.L.); (L.W.L.); (I.R.S.); (S.D.P.)
- Riddet Institute, Palmerston North 4474, New Zealand
- Department of Medicine, University of Auckland, Auckland 1010, New Zealand
- High-Value Nutrition National Science Challenge, Auckland 1023, New Zealand
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10
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A protein-supplemented very-low-calorie diet does not mitigate reductions in lean mass and resting metabolic rate in subjects with overweight or obesity: A randomized controlled trial. Clin Nutr 2021; 40:5726-5733. [PMID: 34749132 DOI: 10.1016/j.clnu.2021.10.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 09/21/2021] [Accepted: 10/06/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND & AIMS The European Food Safety Authority recently recommended an increase in the protein content of total diet replacement (TDR) products from 50 to 75 g/day. The rationale was to minimize reductions in lean mass (LM) and resting metabolic rate (RMR) that occur with weight loss, and thereby facilitate maintenance of lost weight. We sought to directly compare the efficacy of TDR regimens with the new vs the current protein requirement. METHODS We randomized 108 adults with overweight or obesity (body mass index 28-40 kg/m2) to very-low-calorie diets (VLCD) with either 52 or 77 g/day protein for 8 weeks (total energy intake of 600 or 700 kcal/day, respectively). LM was determined by dual energy X-ray absorptiometry and RMR by indirect calorimetry. RESULTS Attrition rate was 22% in both groups. Both VLCDs decreased body weight, fat mass, LM, and RMR (all P < 0.05). Significant time-by-group interactions were detected for weight and fat mass (both P < 0.05), with corresponding reductions being smaller in the higher-protein than the standard-protein VLCD, likely because of the added calories. On the other hand, reductions in LM (6% from baseline) and RMR (9-10% from baseline) did not differ between groups (P = 0.155 and P = 0.389, respectively), and the contribution of LM to total weight loss was identical (27 ± 2% of lost weight, P = 0.973). CONCLUSIONS Our results indicate that the proposed increase in the protein content of TDR products does not attenuate reductions in LM and RMR in individuals with overweight and obesity who are treated with <800 kcal/day VLCDs for 2 months. CLINICAL TRIAL REGISTRY ClinicalTrials.gov # NCT04156165.
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11
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Sandby K, Geiker NRW, Dalamaga M, Grønbæk H, Magkos F. Efficacy of Dietary Manipulations for Depleting Intrahepatic Triglyceride Content: Implications for the Management of Non-alcoholic Fatty Liver Disease. Curr Obes Rep 2021; 10:125-133. [PMID: 33580876 DOI: 10.1007/s13679-021-00430-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/03/2021] [Indexed: 02/08/2023]
Abstract
PURPOSE OF REVIEW Understanding the effects of dietary manipulations on intrahepatic triglyceride (IHTG) balance will have important implications for the prevention and treatment of non-alcoholic fatty liver disease (NAFLD). RECENT FINDINGS Reducing calorie intake to induce weight loss is the most potent intervention to decrease IHTG. Carbohydrate restriction during the initial stages of weight loss may be particularly beneficial, but at later stages, the amount of weight loss predominates over diet composition. By contrast, during weight stability, restricting calories from fat seems to be optimal for depleting liver fat. The degree of dietary fat saturation and the glycemic index of the carbohydrate have inconsistent effects on IHTG. Recently, the matrix of some foods (e.g., dairy) has been inversely associated with NAFLD. Dietary macronutrients differ in their effects on liver fat depending on the energy balance and the matrix of the food in which they are consumed. Therefore, investigations into dietary approaches for managing NAFLD should shift their perspective from that of isolated nutrients to that of whole foods and diets and include useful mechanistic insights.
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Affiliation(s)
- Karoline Sandby
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Frederiksberg, Denmark
| | - Nina Rica Wium Geiker
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Frederiksberg, Denmark
| | - Maria Dalamaga
- Department of Biological Chemistry, National and Kapodistrian University of Athens Medical School, Athens, Greece
| | - Henning Grønbæk
- Department of Hepatology and Gastroenterology, Aarhus University Hospital, Aarhus, Denmark
| | - Faidon Magkos
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Frederiksberg, Denmark.
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12
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Magkos F, Astrup A. Dietary Carbohydrate, Energy Expenditure, and Weight Loss: Is Eating Less and Burning More Possible? J Nutr 2021; 151:468-470. [PMID: 33561211 DOI: 10.1093/jn/nxaa423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/02/2020] [Accepted: 12/04/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Faidon Magkos
- Department of Nutrition, Exercise, and Sports, University of Copenhagen, Frederiksberg C, Denmark
| | - Arne Astrup
- Department of Nutrition, Exercise, and Sports, University of Copenhagen, Frederiksberg C, Denmark.,Novo Nordisk Foundation, Hellerup, Denmark
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