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Dan O, Wertheimer E, Levy I. A Neuroeconomics Approach to Obesity. Biol Psychiatry 2022; 91:860-868. [PMID: 34861975 PMCID: PMC8960474 DOI: 10.1016/j.biopsych.2021.09.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 09/17/2021] [Accepted: 09/21/2021] [Indexed: 11/16/2022]
Abstract
Obesity is a heterogeneous condition that is affected by physiological, behavioral, and environmental factors. Value-based decision making is a useful framework for integrating these factors at the individual level. The disciplines of behavioral economics and reinforcement learning provide tools for identifying specific cognitive and motivational processes that may contribute to the development and maintenance of obesity. Neuroeconomics complements these disciplines by studying the neural mechanisms underlying these processes. We surveyed recent literature on individual decision characteristics that are most frequently implicated in obesity: discounting the value of future outcomes, attitudes toward uncertainty, and learning from rewards and punishments. Our survey highlighted both consistent and inconsistent behavioral findings. These findings underscore the need to examine multiple processes within individuals to identify unique behavioral profiles associated with obesity. Such individual characterization will inform future studies on the neurobiology of obesity as well as the design of effective interventions that are individually tailored.
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Affiliation(s)
- Ohad Dan
- Department of Comparative Medicine, Yale University,Wu-Tsai Institute, Yale University
| | - Emily Wertheimer
- Department of Comparative Medicine, Yale University,Wu-Tsai Institute, Yale University
| | - Ifat Levy
- Department of Comparative Medicine, Yale University, New Haven, Connecticut; Department of Neuroscience, Yale University, New Haven, Connecticut; Department of Psychology, Yale University, New Haven, Connecticut; Wu Tsai Institute, Yale University, New Haven, Connecticut.
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2
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Wiss DA, Brewerton TD, Tomiyama AJ. Limitations of the protective measure theory in explaining the role of childhood sexual abuse in eating disorders, addictions, and obesity: an updated model with emphasis on biological embedding. Eat Weight Disord 2022; 27:1249-1267. [PMID: 34476763 DOI: 10.1007/s40519-021-01293-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 08/23/2021] [Indexed: 12/22/2022] Open
Abstract
In addition to its immediate negative consequences, childhood sexual abuse is associated with lifelong deleterious mental and physical health outcomes. This review employs a biopsychosocial perspective to better understand pathways from childhood sexual abuse to eating disorders, food and drug addictions, and obesity across the life course. Guided by an updated conceptual model, this review delineates how the biological embedding of childhood sexual abuse triggers a cascade of interrelated conditions that often result in failed attempts at weight suppression and eventually obesity. Such biological embedding involves pathways such as inflammation, allostatic load, reward sensitivity, activation of the hypothalamic-pituitary-adrenal axis, epigenetics, and structural and functional changes in the brain. These pathways are in turn theorized to lead to food addiction, substance use disorder, and eating disorders-each with potential pathways toward obesity over time. Predisposing factors to childhood sexual abuse including gender, culture, and age are discussed. This model calls into question the longstanding "protective measure" theory that purports individuals exposed to sexual abuse will deliberately or subconsciously gain weight in attempt to prevent future victimization. A more comprehensive understanding of the mechanisms by which childhood sexual abuse becomes biologically embedded may help clinicians and survivors normalize and/or address disordered eating and weight-related outcomes, as well as identify intervention strategies.Level of evidence: Level V: opinions of respected authorities, based on descriptive studies, narrative reviews, clinical experience, or reports of expert committees.
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Affiliation(s)
- David A Wiss
- Community Health Sciences Department, Fielding School of Public Health, University of California Los Angeles, 650 Young Drive South, Los Angeles, CA, 90095, USA.
| | - Timothy D Brewerton
- Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC, USA
| | - A Janet Tomiyama
- Department of Psychology, University of California, Los Angeles, CA, 90095, USA
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3
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Jewett DC, Liyanagamage DSNK, Avond MAV, Anderson MAB, Twaroski KA, Marek MA, James KF, Pal T, Klockars A, Olszewski PK, Levine AS. Chronic Intermittent Sucrose Consumption Facilitates the Ability to Discriminate Opioid Receptor Blockade with Naltrexone in Rats. Nutrients 2022; 14:nu14050926. [PMID: 35267900 PMCID: PMC8912831 DOI: 10.3390/nu14050926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 02/15/2022] [Accepted: 02/18/2022] [Indexed: 12/20/2022] Open
Abstract
The opioid antagonist naltrexone (NTX) decreases intake of preferred diets in rats at very low doses relative to doses needed to decrease intake of "bland" laboratory chow. In the absence of an opioid agonist, NTX is not discriminable using operant techniques. In the current study, we found that rats given intermittent access to a 25% sucrose solution learned to discriminate between various naltrexone doses and saline. None of the rats given only water learned to discriminate between naltrexone and saline. When access to the sucrose solution was discontinued for 14 days, the rats lost the ability to discriminate between NTX and saline. We also studied the changes of c-Fos IR in selected brain regions in rats treated with saline versus NTX that were drinking water or 25% sucrose. An injection of NTX or saline resulted in a significant drug, diet, and interaction effect in various brain regions associated with feeding behavior, particularly the amygdala, accumbens, and hypothalamic sites. Thus, we found that ingestion of a sucrose solution results in the ability of rats to reliably discriminate naltrexone administration. In addition, sucrose and naltrexone altered c-Fos IR in an interactive fashion in brain regions known to be involved in ingestion behavior.
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Affiliation(s)
- David C. Jewett
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Donisha S. N. K. Liyanagamage
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Mark A. Vanden Avond
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Molly A. B. Anderson
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Kyleigh A. Twaroski
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Morgan A. Marek
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Kimberly F. James
- Department of Psychology, University of Wisconsin-Eau Claire, Eau Claire, WI 54701, USA; (D.C.J.); (M.A.V.A.); (M.A.B.A.); (K.A.T.); (M.A.M.); (K.F.J.)
| | - Tapasya Pal
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Anica Klockars
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
| | - Pawel K. Olszewski
- Faculty of Science and Engineering, University of Waikato, Hamilton 3240, New Zealand; (D.S.N.K.L.); (T.P.); (A.K.); (P.K.O.)
- Department of Integrative Biology and Physiology, Medical School, University of Minnesota, Minneapolis, MN 55414, USA
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA
| | - Allen S. Levine
- Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA
- Correspondence:
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Maske CB, Coiduras II, Ondriezek ZE, Terrill SJ, Williams DL. Intermittent High-Fat Diet Intake Reduces Sensitivity to Intragastric Nutrient Infusion and Exogenous Amylin in Female Rats. Obesity (Silver Spring) 2020; 28:942-952. [PMID: 32237211 PMCID: PMC7180114 DOI: 10.1002/oby.22779] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 02/11/2020] [Accepted: 02/13/2020] [Indexed: 01/01/2023]
Abstract
OBJECTIVE Intermittent (INT) access to a high-fat diet (HFD) can induce excessive-intake phenotypes in rodents. This study hypothesized that impaired satiation responses contribute to elevated intake in an INT-HFD access model. METHODS First, this study characterized the intake and meal patterns of female rats that were subjected to an INT HFD in which a 45% HFD was presented for 20 hours every fourth day. To examine nutrient-induced satiation, rats received intragastric infusions of saline or Ensure Plus prior to darkness-onset food access. A similar design was used to examine sensitivity to the satiating effect of amylin. This study then examined whether an INT HFD influences amylin-induced c-Fos in feeding-relevant brain areas. RESULTS Upon INT HFD access, rats consumed meals of larger size. The anorexic response to intragastric Ensure infusion and exogenous amylin treatment was blunted in INT rats on both chow-only and INT-HFD days of the diet regimen, compared with chow-maintained and continuous-HFD rats. An INT HFD did not influence amylin-induced c-Fos in the area postrema, nucleus of the solitary tract, and lateral parabrachial nucleus. CONCLUSIONS Impaired satiation responses, mediated in part by reduced sensitivity to amylin, may explain the elevated intake observed upon INT HFD access and may play a role in disorders of INT overconsumption, including binge eating.
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Affiliation(s)
- Calyn B Maske
- Program in Neuroscience, Department of Psychology, Florida State University, Tallahassee, Florida, USA
| | - Isabel I Coiduras
- Program in Neuroscience, Department of Psychology, Florida State University, Tallahassee, Florida, USA
| | - Zeleen E Ondriezek
- Program in Neuroscience, Department of Psychology, Florida State University, Tallahassee, Florida, USA
| | - Sarah J Terrill
- Program in Neuroscience, Department of Psychology, Florida State University, Tallahassee, Florida, USA
| | - Diana L Williams
- Program in Neuroscience, Department of Psychology, Florida State University, Tallahassee, Florida, USA
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Sylvetsky AC, Hiedacavage A, Shah N, Pokorney P, Baldauf S, Merrigan K, Smith V, Long MW, Black R, Robien K, Avena N, Gaine C, Greenberg D, Wootan MG, Talegawkar S, Colon‐Ramos U, Leahy M, Ohmes A, Mennella JA, Sacheck J, Dietz WH. From biology to behavior: a cross-disciplinary seminar series surrounding added sugar and low-calorie sweetener consumption. Obes Sci Pract 2019; 5:203-219. [PMID: 31275594 PMCID: PMC6587329 DOI: 10.1002/osp4.334] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2018] [Revised: 02/06/2019] [Accepted: 02/10/2019] [Indexed: 12/14/2022] Open
Abstract
INTRODUCTION This report presents a synopsis of a three-part, cross-sector, seminar series held at the George Washington University (GWU) in Washington, DC from February-April, 2018. The overarching goal of the seminar series was to provide a neutral forum for diverse stakeholders to discuss and critically evaluate approaches to address added sugar intake, with a key focus on the role of low-calorie sweeteners (LCS). METHODS During three seminars, twelve speakers from academic institutions, federal agencies, non-profit organizations, and the food and beverage industries participated in six interactive panel discussions to address: 1) Do Farm Bill Policies Impact Population Sugar Intake? 2) What is the Impact of Sugar-sweetened Beverage (SSB) Taxes on Health and Business? 3) Is Sugar Addictive? 4) Product Reformulation Efforts: Progress, Challenges, and Concerns? 5) Low-calorie Sweeteners: Helpful or Harmful, and 6) Are Novel Sweeteners a Plausible Solution? Discussion of each topic involved brief 15-minute presentations from the speakers, which were followed by a 25-minute panel discussion moderated by GWU faculty members and addressed questions generated by the audience. Sessions were designed to represent opposing views and stimulate meaningful debate. Given the provocative nature of the seminar series, attendee questions were gathered anonymously using Pigeonhole™, an interactive, online, question and answer platform. RESULTS This report summarizes each presentation and recapitulates key perspectives offered by the speakers and moderators. CONCLUSIONS The seminar series set the foundation for robust cross-sector dialogue necessary to inform meaningful future research, and ultimately, effective policies for lowering added sugar intakes.
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Affiliation(s)
- A. C. Sylvetsky
- Milken Institute School of Public HealthThe George Washington University
| | - A. Hiedacavage
- Milken Institute School of Public HealthThe George Washington University
| | - N. Shah
- Milken Institute School of Public HealthThe George Washington University
| | - P. Pokorney
- Milken Institute School of Public HealthThe George Washington University
| | - S. Baldauf
- Milken Institute School of Public HealthThe George Washington University
| | - K. Merrigan
- Milken Institute School of Public HealthThe George Washington University
- Swette Center for Sustainable Food SystemsArizona State University
| | - V. Smith
- Department of Agricultural EconomicsMontana State University
| | - M. W. Long
- Milken Institute School of Public HealthThe George Washington University
| | - R. Black
- Quadrant D Consulting, LLCTufts University Friedman School of Nutrition Science & Policy
| | - K. Robien
- Milken Institute School of Public HealthThe George Washington University
| | - N. Avena
- Department of NeuroscienceMount Sinai School of Medicine
- Department of PsychologyPrinceton University
| | | | - D. Greenberg
- PepsiCo Inc. (Current affiliation NutriSci Inc.)
| | | | - S. Talegawkar
- Milken Institute School of Public HealthThe George Washington University
| | - U. Colon‐Ramos
- Milken Institute School of Public HealthThe George Washington University
| | - M. Leahy
- Food, Nutrition & Policy Solutions LLC
| | | | | | - J. Sacheck
- Milken Institute School of Public HealthThe George Washington University
| | - W. H. Dietz
- Milken Institute School of Public HealthThe George Washington University
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6
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Bassareo V, Gambarana C. Editorial: Food and Its Effect on the Brain: From Physiological to Compulsive Consumption. Front Psychiatry 2019; 10:209. [PMID: 31019474 PMCID: PMC6459024 DOI: 10.3389/fpsyt.2019.00209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 03/22/2019] [Indexed: 11/13/2022] Open
Affiliation(s)
- Valentina Bassareo
- Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy.,Department of Biomedical Sciences, National Institute of Neuroscience, Cagliari section, Cagliari, Italy
| | - Carla Gambarana
- Department of Molecular and Developmental Medicine, University of Siena, Siena, Italy
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7
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Wiss DA, Avena N, Rada P. Sugar Addiction: From Evolution to Revolution. Front Psychiatry 2018; 9:545. [PMID: 30464748 PMCID: PMC6234835 DOI: 10.3389/fpsyt.2018.00545] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 10/12/2018] [Indexed: 12/12/2022] Open
Abstract
The obesity epidemic has been widely publicized in the media worldwide. Investigators at all levels have been looking for factors that have contributed to the development of this epidemic. Two major theories have been proposed: (1) sedentary lifestyle and (2) variety and ease of inexpensive palatable foods. In the present review, we analyze how nutrients like sugar that are often used to make foods more appealing could also lead to habituation and even in some cases addiction thereby uniquely contributing to the obesity epidemic. We review the evolutionary aspects of feeding and how they have shaped the human brain to function in "survival mode" signaling to "eat as much as you can while you can." This leads to our present understanding of how the dopaminergic system is involved in reward and its functions in hedonistic rewards, like eating of highly palatable foods, and drug addiction. We also review how other neurotransmitters, like acetylcholine, interact in the satiation processes to counteract the dopamine system. Lastly, we analyze the important question of whether there is sufficient empirical evidence of sugar addiction, discussed within the broader context of food addiction.
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Affiliation(s)
- David A. Wiss
- Fielding School of Public Health, University of California, Los Angeles, Los Angeles, CA, United States
| | - Nicole Avena
- Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Pedro Rada
- School of Medicine, University of Los Andes, Mérida, Venezuela
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Brewer JA, Ruf A, Beccia AL, Essien GI, Finn LM, van Lutterveld R, Mason AE. Can Mindfulness Address Maladaptive Eating Behaviors? Why Traditional Diet Plans Fail and How New Mechanistic Insights May Lead to Novel Interventions. Front Psychol 2018; 9:1418. [PMID: 30250438 PMCID: PMC6139346 DOI: 10.3389/fpsyg.2018.01418] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 07/20/2018] [Indexed: 01/20/2023] Open
Abstract
Emotional and other maladaptive eating behaviors develop in response to a diversity of triggers, from psychological stress to the endless external cues in our modern food environment. While the standard approach to food- and weight-related concerns has been weight-loss through dietary restriction, these interventions have produced little long-term benefit, and may be counterproductive. A growing understanding of the behavioral and neurobiological mechanisms that underpin habit formation may explain why this approach has largely failed, and pave the way for a new generation of non-pharmacologic interventions. Here, we first review how modern food environments interact with human biology to promote reward-related eating through associative learning, i.e., operant conditioning. We also review how operant conditioning (positive and negative reinforcement) cultivates habit-based reward-related eating, and how current diet paradigms may not directly target such eating. Further, we describe how mindfulness training that targets reward-based learning may constitute an appropriate intervention to rewire the learning process around eating. We conclude with examples that illustrate how teaching patients to tap into and act on intrinsic (e.g., enjoying healthy eating, not overeating, and self-compassion) rather than extrinsic reward mechanisms (e.g., weighing oneself), is a promising new direction in improving individuals' relationship with food.
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Affiliation(s)
- Judson A. Brewer
- Center for Mindfulness in Medicine, Healthcare, and Society, Division of Mindfulness, University of Massachusetts Medical School, Worcester, MA, United States
| | - Andrea Ruf
- Center for Mindfulness in Medicine, Healthcare, and Society, Division of Mindfulness, University of Massachusetts Medical School, Worcester, MA, United States
| | - Ariel L. Beccia
- Center for Mindfulness in Medicine, Healthcare, and Society, Division of Mindfulness, University of Massachusetts Medical School, Worcester, MA, United States
- Department of Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, MA, United States
| | - Gloria I. Essien
- Contemplative Studies, Brown University, Providence, RI, United States
| | - Leonard M. Finn
- Needham Wellesley Family Medicine PC, Wellesley, MA, United States
- Department of Family Medicine and Community Health, University of Massachusetts Medical School, Worcester, MA, United States
| | - Remko van Lutterveld
- Center for Mindfulness in Medicine, Healthcare, and Society, Division of Mindfulness, University of Massachusetts Medical School, Worcester, MA, United States
| | - Ashley E. Mason
- Department of Medicine, Osher Center for Integrative Medicine, University of California, San Francisco, San Francisco, CA, United States
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9
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Burokas A, Martín-García E, Espinosa-Carrasco J, Erb I, McDonald J, Notredame C, Dierssen M, Maldonado R. Extinction and reinstatement of an operant responding maintained by food in different models of obesity. Addict Biol 2018; 23:544-555. [PMID: 29282813 DOI: 10.1111/adb.12597] [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: 03/06/2017] [Revised: 10/09/2017] [Accepted: 12/04/2017] [Indexed: 02/02/2023]
Abstract
A major problem in treating obesity is the high rate of relapse to abnormal food-taking habits after maintaining an energy balanced diet. Alterations of eating behavior such as compulsive-like behavior and lack of self-control over food intake play a critical role in relapse. In this study, we used an operant paradigm of food-seeking behavior on two different diet-induced obesity models, a free-choice chocolate-mixture diet and a high-fat diet with face validity for a rapid development of obesity or for unhealthy food regularly consumed in our societies. A reduced operant performance and motivation for the hedonic value of palatable chocolate pellets was revealed in both obesity mouse models. However, only mice exposed to high-fat diet showed an increased compulsive-like behavior in the absence of the reinforcer further characterized by impaired operant learning, enhanced impulsivity and intensified inflexibility. We used principal component analysis to globally identify the specific behaviors responsible for the differences among diet groups. Learning impairment and inflexible behaviors contributed to a first principal component, explaining the largest proportion of the variance in the high-fat diet mice phenotype. Reinforcement, impulsion and compulsion were the main contributors to the second principal component explaining the differences in the chocolate-mixture mice behavioral phenotype. These behaviors were not exclusive of chocolate group because some high-fat individuals showed similar values on this component. These data indicate that extended access to hypercaloric diets differentially modifies operant behavior learning, behavioral flexibility, impulsive-like and compulsive-like behavior, and these effects were dependent on the exposure to each specific diet.
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Affiliation(s)
- Aurelijus Burokas
- Laboratori de Neurofarmacologia. Departament de Ciencies Experimentals i de la Salut; Universitat Pompeu Fabra; Barcelona Spain
| | - Elena Martín-García
- Laboratori de Neurofarmacologia. Departament de Ciencies Experimentals i de la Salut; Universitat Pompeu Fabra; Barcelona Spain
| | - Jose Espinosa-Carrasco
- Cellular & Systems Neurobiology, Systems Biology Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Comparative Bioinformatics, Bioinformatics and Genomics Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Universitat Pompeu Fabra (UPF); Barcelona Spain
| | - Ionas Erb
- Comparative Bioinformatics, Bioinformatics and Genomics Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Universitat Pompeu Fabra (UPF); Barcelona Spain
| | - Jerome McDonald
- Cellular & Systems Neurobiology, Systems Biology Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Universitat Pompeu Fabra (UPF); Barcelona Spain
| | - Cedric Notredame
- Comparative Bioinformatics, Bioinformatics and Genomics Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Universitat Pompeu Fabra (UPF); Barcelona Spain
| | - Mara Dierssen
- Cellular & Systems Neurobiology, Systems Biology Program, The Barcelona Institute of Science and Technology; Centre for Genomic Regulation (CRG); Barcelona Spain
- Universitat Pompeu Fabra (UPF); Barcelona Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER); Valencia Spain
| | - Rafael Maldonado
- Laboratori de Neurofarmacologia. Departament de Ciencies Experimentals i de la Salut; Universitat Pompeu Fabra; Barcelona Spain
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Hardaway JA, Jensen J, Kim M, Mazzone CM, Sugam JA, Diberto JF, Lowery-Gionta EG, Hwa LS, Pleil KE, Bulik CM, Kash TL. Nociceptin receptor antagonist SB 612111 decreases high fat diet binge eating. Behav Brain Res 2016; 307:25-34. [PMID: 27036650 PMCID: PMC4896639 DOI: 10.1016/j.bbr.2016.03.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 03/25/2016] [Accepted: 03/28/2016] [Indexed: 10/22/2022]
Abstract
Binge eating is a dysregulated form of feeding behavior that occurs in multiple eating disorders including binge-eating disorder, the most common eating disorder. Feeding is a complex behavioral program supported through the function of multiple brain regions and influenced by a diverse array of receptor signaling pathways. Previous studies have shown the overexpression of the opioid neuropeptide nociceptin (orphanin FQ, N/OFQ) can induce hyperphagia, but the role of endogenous nociceptin receptor (NOP) in naturally occurring palatability-induced hyperphagia is unknown. In this study we adapted a simple, replicable form of binge eating of high fat food (HFD). We found that male and female C57BL/6J mice provided with daily one-hour access sessions to HFD eat significantly more during this period than those provided with continuous 24h access. This form of feeding is rapid and entrained. Chronic intermittent HFD binge eating produced hyperactivity and increased light zone exploration in the open field and light-dark assays respectively. Treatment with the potent and selective NOP antagonist SB 612111 resulted in a significant dose-dependent reduction in binge intake in both male and female mice, and, unlike treatment with the serotonin selective reuptake inhibitor fluoxetine, produced no change in total 24-h food intake. SB 612111 treatment also significantly decreased non-binge-like acute HFD consumption in male mice. These data are consistent with the hypothesis that high fat binge eating is modulated by NOP signaling and that the NOP system may represent a promising novel receptor to explore for the treatment of binge eating.
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Affiliation(s)
- J Andrew Hardaway
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Jennifer Jensen
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Michelle Kim
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Christopher M Mazzone
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Jonathan A Sugam
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Jeffrey F Diberto
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Emily G Lowery-Gionta
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Lara S Hwa
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Kristen E Pleil
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA
| | - Cynthia M Bulik
- UNC Department of Psychiatry, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Nutrition, University of North Carolina at Chapel Hill, NC, USA; Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
| | - Thomas L Kash
- Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, NC, USA; UNC Department of Pharmacology, University of North Carolina at Chapel Hill, NC, USA.
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Abstract
Binge eating disorder is characterized by excessive, uncontrollable consumption of palatable food within brief periods of time. Excessive intake of palatable food is thought to be driven by hedonic, rather than energy homeostatic, mechanisms. However, reward processing does not only comprise consummatory actions; a key component is represented by the anticipatory phase directed at procuring the reward. This phase is highly influenced by environmental food-associated stimuli, which can robustly enhance the desire to eat even in the absence of physiological needs. The opioid system (endogenous peptides and their receptors) has been strongly linked to the rewarding aspects of palatable food intake, and perhaps represents the key system involved in hedonic overeating. Here we review evidence suggesting that the opioid system can also be regarded as one of the systems that regulates the anticipatory incentive processes preceding binge eating hedonic episodes.
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Calvez J, de Ávila C, Matte LO, Guèvremont G, Gundlach AL, Timofeeva E. Role of relaxin-3/RXFP3 system in stress-induced binge-like eating in female rats. Neuropharmacology 2015; 102:207-15. [PMID: 26607097 DOI: 10.1016/j.neuropharm.2015.11.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Revised: 11/04/2015] [Accepted: 11/13/2015] [Indexed: 11/16/2022]
Abstract
Binge eating is frequently stimulated by stress. The neuropeptide relaxin-3 (RLN3) and its native receptor RXFP3 are implicated in stress and appetitive behaviors. We investigated the dynamics of the central RLN3/RXFP3 system in a newly established model of stress-induced binge eating. Female Sprague-Dawley rats were subjected to unpredictable intermittent 1-h access to 10% sucrose. When sucrose intake stabilized, rats were assessed for consistency of higher or lower sucrose intake in response to three unpredictable episodes of foot-shock stress; and assigned as binge-like eating prone (BEP) or binge-like eating resistant (BER). BEP rats displayed elevated consumption of sucrose under non-stressful conditions (30% > BER) and an additional marked increase in sucrose intake (60% > BER) in response to stress. Conversely, sucrose intake in BER rats was unaltered by stress. Chow intake was similar in both phenotypes on 'non-stress' days, but was significantly reduced by stress in BER, but not BEP, rats. After stress, BEP, but not BER, rats displayed a significant increase in RLN3 mRNA levels in the nucleus incertus. In addition, in response to stress, BEP, but not BER, rats had increased RXFP3 mRNA levels in the paraventricular and supraoptic nuclei of the hypothalamus. Intracerebroventricular administration of a selective RXFP3 antagonist, R3(B1-22)R, blocked the stress-induced increase in sucrose intake in BEP rats and had no effect on sucrose intake in BER rats. These results provide important evidence for a role of the central RLN3/RXFP3 system in the regulation of stress-induced binge eating in rats, and have therapeutic implications for eating disorders.
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Affiliation(s)
- Juliane Calvez
- Faculté de Médecine, Département de Psychiatrie et de Neurosciences, Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Camila de Ávila
- Faculté de Médecine, Département de Psychiatrie et de Neurosciences, Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Louis-Olivier Matte
- Faculté de Médecine, Département de Psychiatrie et de Neurosciences, Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Geneviève Guèvremont
- Faculté de Médecine, Département de Psychiatrie et de Neurosciences, Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Andrew L Gundlach
- The Florey Institute of Neuroscience and Mental Health, Parkville, Victoria 3052, Australia; Florey Department of Neuroscience and Mental Health and Department of Anatomy and Neuroscience, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Elena Timofeeva
- Faculté de Médecine, Département de Psychiatrie et de Neurosciences, Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, QC, G1V 0A6, Canada.
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Why is obesity such a problem in the 21st century? The intersection of palatable food, cues and reward pathways, stress, and cognition. Neurosci Biobehav Rev 2015; 58:36-45. [DOI: 10.1016/j.neubiorev.2014.12.002] [Citation(s) in RCA: 173] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 11/15/2014] [Accepted: 12/02/2014] [Indexed: 01/10/2023]
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Pearson CM, Wonderlich SA, Smith GT. A risk and maintenance model for bulimia nervosa: From impulsive action to compulsive behavior. Psychol Rev 2015; 122:516-35. [PMID: 25961467 PMCID: PMC4486518 DOI: 10.1037/a0039268] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This article offers a new model for bulimia nervosa (BN) that explains both the initial impulsive nature of binge eating and purging, as well as the compulsive quality of the fully developed disorder. The model is based on a review of advances in research on BN and advances in relevant basic psychological science. It integrates transdiagnostic personality risk, eating-disorder-specific risk, reinforcement theory, cognitive neuroscience, and theory drawn from the drug addiction literature. We identify both a state-based and a trait-based risk pathway, and we then propose possible state-by-trait interaction risk processes. The state-based pathway emphasizes depletion of self-control. The trait-based pathway emphasizes transactions between the trait of negative urgency (the tendency to act rashly when distressed) and high-risk psychosocial learning. We then describe a process by which initially impulsive BN behaviors become compulsive over time, and we consider the clinical implications of our model. (PsycINFO Database Record
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Affiliation(s)
| | - Stephen A Wonderlich
- Department of Clinical Neuroscience, Neuropsychiatric Research Institute, University of North Dakota School of Medicine and Health Sciences
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Differences in bingeing behavior and cocaine reward following intermittent access to sucrose, glucose or fructose solutions. Neuroscience 2015; 301:213-20. [PMID: 26079112 DOI: 10.1016/j.neuroscience.2015.06.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 06/01/2015] [Accepted: 06/08/2015] [Indexed: 01/28/2023]
Abstract
Daily intermittent access to sugar solutions results in intense bouts of sugar intake (i.e. bingeing) in rats. Bingeing on sucrose, a disaccharide of glucose and fructose, has been associated with a "primed" mesolimbic dopamine (DA) pathway. Recent studies suggest glucose and fructose engage brain reward and energy-sensing mechanisms in opposing ways and may drive sucrose intake through unique neuronal circuits. Here, we examined in male Sprague-Dawley rats whether or not (1) intermittent access to isocaloric solutions of sucrose, glucose or fructose results in distinctive sugar-bingeing profiles and (2) previous sugar bingeing alters cocaine locomotor activation and/or reward, as determined by conditioned place preference (CPP). To encourage bingeing, rats were given 24-h access to water and 12-h-intermittent access to chow plus an intermittent bottle that contained water (control) or 8% solutions of sucrose, glucose or fructose for 9days, followed by ad libitum chow diet and a 10-day cocaine (15mg/kg; i.p.) CPP paradigm. By day 4 of the sugar-bingeing diet, sugar bingeing in the fructose group surpassed the glucose group, with the sucrose group being intermediate. All three sugar groups had similar chow and water intake throughout the diet. In contrast, controls exhibited chow bingeing by day 5 without altering water intake. Similar magnitudes of cocaine CPP were observed in rats with a history of sucrose, fructose or chow (control) bingeing. Notably, the glucose-bingeing rats did not demonstrate a significant cocaine CPP despite showing similar cocaine-induced locomotor activity as the other diet groups. Overall, these results show that fructose and glucose, the monosaccharide components of sucrose, produce divergent degrees of bingeing and cocaine reward.
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Characterization of a shortened model of diet alternation in female rats: effects of the CB1 receptor antagonist rimonabant on food intake and anxiety-like behavior. Behav Pharmacol 2015; 25:609-17. [PMID: 25011007 DOI: 10.1097/fbp.0000000000000059] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The prevalence of eating disorders and obesity in western societies is epidemic and increasing in severity. Preclinical research has focused on the development of animal models that can mimic the maladaptive patterns of food intake observed in certain forms of eating disorders and obesity. This study was aimed at characterizing a recently established model of palatable diet alternation in female rats. For this purpose, females rats were fed either continuously with a regular chow diet (Chow/Chow) or intermittently with a regular chow diet for 2 days and a palatable, high-sucrose diet for 1 day (Chow/Palatable). Following diet cycling, rats were administered rimonabant (0, 0.3, 1, 3 mg/kg intraperitoneally) during access to either palatable diet or chow diet and were assessed for food intake and body weight. Finally, rats were pretreated with rimonabant (0, 3 mg/kg, intraperitoneally) and tested in the elevated plus maze during withdrawal from the palatable diet. Female rats with alternating access to palatable food cycled their intake, overeating during access to the palatable diet and undereating upon returning to the regular chow diet. Rimonabant treatment resulted in increased chow hypophagia and anxiety-like behavior in Chow/Palatable rats. No effect of drug treatment was observed on the compulsive eating of palatable food in the diet-cycled rats. The results of this study suggest that withdrawal from alternating access to the palatable diet makes individuals vulnerable to the anxiogenic effects of rimonabant and provides etiological factors potentially responsible for the emergence of severe psychiatric side-effects following rimonabant treatment in obese patients.
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Mitra A, Lenglos C, Timofeeva E. Inhibition in the lateral septum increases sucrose intake and decreases anorectic effects of stress. Eur J Neurosci 2014; 41:420-33. [DOI: 10.1111/ejn.12798] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 10/15/2014] [Accepted: 10/31/2014] [Indexed: 12/25/2022]
Affiliation(s)
- Arojit Mitra
- Stress and Feeding Laboratory; IUCPQ; Department of Psychiatry and Neuroscience; Laval University; Quebec QC Canada
| | - Christophe Lenglos
- Stress and Feeding Laboratory; IUCPQ; Department of Psychiatry and Neuroscience; Laval University; Quebec QC Canada
| | - Elena Timofeeva
- Stress and Feeding Laboratory; IUCPQ; Department of Psychiatry and Neuroscience; Laval University; Quebec QC Canada
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Yasoshima Y, Shimura T. A mouse model for binge-like sucrose overconsumption: Contribution of enhanced motivation for sweetener consumption. Physiol Behav 2014; 138:154-64. [PMID: 25446199 DOI: 10.1016/j.physbeh.2014.10.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 10/27/2014] [Accepted: 10/29/2014] [Indexed: 01/25/2023]
Abstract
Behavioral and neural features of binge-like sugar overconsumption have been studied using rat models. However, few mouse models are available to examine the interaction between neural and genetic underpinnings of bingeing. In the present study, we first aim to establish a simple mouse model of binge-like sucrose overconsumption using daytime limited access training in food-restricted male mice. Trained mice received 4-h limited access to both 0.5M sucrose solution and chow for 10 days. Three control groups received (1) 4-h sucrose and 20-h chow access, (2) 20-h sucrose and 4-h, or (3) 20-h chow access, respectively. Only the trained group showed progressively increased sucrose consumption during brief periods of time and developed binge-like excessive behavior. Next, we examined whether the present mouse model mimicked a human feature of binge eating known as "eating when not physically hungry." Trained mice consumed significantly more sucrose or non-caloric sweetener (saccharin) during post-training days even after they nocturnally consumed substantial chow prior to daytime sweetener access. In other trained groups, both a systemic administration of glucose and substantial chow consumption prior to the daytime limited sucrose access failed to reduce binge-like sucrose overconsumption. Our results suggest that even when caloric consumption is not necessarily required, limited access training shapes and triggers binge-like overconsumption of sweetened solution in trained mice. The binge-like behavior in trained mice may be mainly due to enhanced hedonic motivation for the sweetener's taste. The present study suggests that our mouse model for binge-like sugar overconsumption may mimic some human features of binge eating and can be used to investigate the roles of neural and genetic mechanisms in binge-like overconsumption of sweetened substances in the absence of physical hunger.
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Affiliation(s)
- Yasunobu Yasoshima
- Division of Behavioral Physiology, Department of Behavioral Sciences, Graduate School of Human Science, Osaka University, 1-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
| | - Tsuyoshi Shimura
- Division of Behavioral Physiology, Department of Behavioral Sciences, Graduate School of Human Science, Osaka University, 1-2 Yamadaoka, Suita, Osaka 565-0871, Japan
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Hadad NA, Knackstedt LA. Addicted to palatable foods: comparing the neurobiology of Bulimia Nervosa to that of drug addiction. Psychopharmacology (Berl) 2014; 231:1897-912. [PMID: 24500676 PMCID: PMC4484591 DOI: 10.1007/s00213-014-3461-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Accepted: 01/20/2014] [Indexed: 12/18/2022]
Abstract
RATIONALE Bulimia nervosa (BN) is highly comorbid with substance abuse and shares common phenotypic and genetic predispositions with drug addiction. Although treatments for the two disorders are similar, controversy remains about whether BN should be classified as addiction. OBJECTIVES Here, we review the animal and human literature with the goal of assessing whether BN and drug addiction share a common neurobiology. RESULTS Similar neurobiological features are present following administration of drugs and bingeing on palatable food, especially sugar. Specifically, both disorders involve increases in extracellular dopamine (DA), D1 binding, D3 messenger RNA (mRNA), and ΔFosB in the nucleus accumbens (NAc). Animal models of BN reveal increases in ventral tegmental area (VTA) DA and enzymes involved in DA synthesis that resemble changes observed after exposure to addictive drugs. Additionally, alterations in the expression of glutamate receptors and prefrontal cortex activity present in human BN or following sugar bingeing in animals are comparable to the effects of addictive drugs. The two disorders differ in regards to alterations in NAc D2 binding, VTA DAT mRNA expression, and the efficacy of drugs targeting glutamate to treat these disorders. CONCLUSIONS Although additional empirical studies are necessary, the synthesis of the two bodies of research presented here suggests that BN shares many neurobiological features with drug addiction. While few Food and Drug Administration-approved options currently exist for the treatment of drug addiction, pharmacotherapies developed in the future, which target the glutamate, DA, and opioid systems, may be beneficial for the treatment of both BN and drug addiction.
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Affiliation(s)
- Natalie A Hadad
- Department of Psychology, University of Florida, P.O. Box 112250, Gainesville, FL, 32611-2250, USA
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Rorabaugh JM, Stratford JM, Zahniser NR. A relationship between reduced nucleus accumbens shell and enhanced lateral hypothalamic orexin neuronal activation in long-term fructose bingeing behavior. PLoS One 2014; 9:e95019. [PMID: 24736531 PMCID: PMC3988143 DOI: 10.1371/journal.pone.0095019] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 03/21/2014] [Indexed: 02/06/2023] Open
Abstract
Fructose accounts for 10% of daily calories in the American diet. Fructose, but not glucose, given intracerebroventricularly stimulates homeostatic feeding mechanisms within the hypothalamus; however, little is known about how fructose affects hedonic feeding centers. Repeated ingestion of sucrose, a disaccharide of fructose and glucose, increases neuronal activity in hedonic centers, the nucleus accumbens (NAc) shell and core, but not the hypothalamus. Rats given glucose in the intermittent access model (IAM) display signatures of hedonic feeding including bingeing and altered DA receptor (R) numbers within the NAc. Here we examined whether substituting fructose for glucose in this IAM produces bingeing behavior, alters DA Rs and activates hedonic and homeostatic feeding centers. Following long-term (21-day) exposure to the IAM, rats given 8–12% fructose solutions displayed fructose bingeing but unaltered DA D1R or D2R number. Fructose bingeing rats, as compared to chow bingeing controls, exhibited reduced NAc shell neuron activation, as determined by c-Fos-immunoreactivity (Fos-IR). This activation was negatively correlated with orexin (Orx) neuron activation in the lateral hypothalamus/perifornical area (LH/PeF), a brain region linking homeostatic to hedonic feeding centers. Following short-term (2-day) access to the IAM, rats exhibited bingeing but unchanged Fos-IR, suggesting only long-term fructose bingeing increases Orx release. In long-term fructose bingeing rats, pretreatment with the Ox1R antagonist SB-334867 (30 mg/kg; i.p.) equally reduced fructose bingeing and chow intake, resulting in a 50% reduction in calories. Similarly, in control rats, SB-334867 reduced chow/caloric intake by 60%. Thus, in the IAM, Ox1Rs appear to regulate feeding based on caloric content rather than palatability. Overall, our results, in combination with the literature, suggest individual monosaccharides activate distinct neuronal circuits to promote feeding behavior. Specifically, long-term fructose bingeing activates a hyperphagic circuit composed in part of NAc shell and LH/PeF Orx neurons.
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Affiliation(s)
- Jacki M. Rorabaugh
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America
- * E-mail:
| | - Jennifer M. Stratford
- Rocky Mountain Taste and Smell Center, Department of Cell and Developmental Biology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America
| | - Nancy R. Zahniser
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America
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Micioni Di Bonaventura MV, Ubaldi M, Liberati S, Ciccocioppo R, Massi M, Cifani C. Caloric restriction increases the sensitivity to the hyperphagic effect of nociceptin/orphanin FQ limiting its ability to reduce binge eating in female rats. Psychopharmacology (Berl) 2013; 228:53-63. [PMID: 23455592 DOI: 10.1007/s00213-013-3013-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Accepted: 01/26/2013] [Indexed: 01/20/2023]
Abstract
RATIONALE Nociceptin/orphanin FQ (N/OFQ) is a functional antagonist of corticotrophin-releasing factor, the main mediator of the stress response. Stress represents a key determinant of binge eating (BE) for highly palatable food (HPF). OBJECTIVES In relation to the antistress properties of N/OFQ, we evaluated its effect on BE. After the observation that episodes of food restriction increase the sensitivity to its hyperphagic effects, the function of NOP receptor and N/OFQ was investigated after cycles of food restrictions. MATERIALS AND METHODS In BE experiments, four groups were used: rats fed normally and not stressed or stressed, rats exposed to cycles of restriction/refeeding and then stressed, or not stressed. In the other experiments, two groups were used: rats exposed or not to food restriction. RESULTS Only restricted and stressed rats exhibited BE for HPF (containing chocolate cream). Intracerebroventricular injections of N/OFQ of 0.5 nmol/rat significantly reduced BE. N/OFQ 1 nmol/rat did not reduce BE but significantly increased HPF intake following food restrictions. Cycles of food restriction increased animals' sensitivity to the hyperphagic effect of N/OFQ for HPF. In situ hybridization studies following food restrictions showed decreased ppN/OFQ mRNA expression in the bed nucleus of the stria terminalis and increased expression of ppN/OFQ and NOP receptor mRNA in the ventral tegmental area and in the ventromedial hypothalamus, respectively. CONCLUSIONS These findings indicate that N/OFQ slightly reduces BE at low doses, while higher doses increase HPF intake, due to increased sensitivity to its hyperphagic effect following a history of caloric restrictions.
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22
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Fortuna JL. The obesity epidemic and food addiction: clinical similarities to drug dependence. J Psychoactive Drugs 2012; 44:56-63. [PMID: 22641965 DOI: 10.1080/02791072.2012.662092] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
As of 2010 nearly 70% of adult Americans were overweight or obese. Specifically, 35.7% of adult Americans are obese, and this is the highest level of obesity in the recorded history of the United States. A number of environmental factors, most notably the number of fast food outlets, have contributed to the obesity epidemic as well as to the binge prone dynamic. There is evidence that bingeing on sugar-dense, palatable foods increases extracellular dopamine in the striatum and thereby possesses addictive potential. Moreover, elevated blood glucose levels catalyze the absorption of tryptophan through the large neutral amino acid (LNAA) complex and its subsequent conversion into the mood-elevating chemical serotonin. There appear to be several biological and psychological similarities between food addiction and drug dependence including craving and loss of control. Nonetheless there is at least one apparent difference: acute tryptophan depletion does not appear to induce a relapse in recovering drug-dependent individuals, although it may induce dysphoria. In some individuals, palatable foods have palliative properties and can be viewed as a form of self medication. This article will examine environmental factors that have contributed to the obesity epidemic, and will compare the clinical similarities and differences of food addiction and drug dependence.
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Affiliation(s)
- Jeffrey L Fortuna
- Department of Health Science, California State University, Fullerton, CA 92831, USA.
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Melanin-concentrating hormone receptor 1 (MCH1-R) antagonism: reduced appetite for calories and suppression of addictive-like behaviors. Pharmacol Biochem Behav 2012; 102:400-6. [PMID: 22705492 DOI: 10.1016/j.pbb.2012.06.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Revised: 05/29/2012] [Accepted: 06/09/2012] [Indexed: 11/23/2022]
Abstract
RATIONALE The hypothalamic neuropeptide melanin-concentrating hormone and its MCH1 receptor have been implicated in regulation of feeding and energy homeostasis, as well as modulation of reward-related behaviors. Here, we examined whether the MCH system plays a role both in caloric and motivational aspects of sugar intake. MATERIALS AND METHODS The non-peptide MCH1-R antagonist GW803430 (3, 10, 30 mg/kg, i.p.) was first tested on self-administration under a fixed ratio schedule of reinforcement of both a caloric (10% w/v sucrose) and a non-caloric (0.06% w/v saccharin) sweet solution. GW803430 was then tested for its ability to alter motivational properties and seeking of sucrose. Lastly, the drug was tested to concurrently examine its effects on the escalated consumption of both sugar and food in animals following intermittent sugar access. RESULTS The MCH1-R antagonist reduced sucrose- but not saccharin-reinforced lever pressing, likely reflecting a decreased appetite for calories in GW803430-treated rats. GW803430 reduced sucrose self-administration under a progressive ratio schedule, and suppressed cue-induced reinstatement of sucrose seeking, suggesting effects on rewarding properties of sucrose. GW803430 attenuated food intake in rats on intermittent access to sucrose at all doses examined (3, 10, 30 mg/kg), while reduction of sugar intake was weaker in magnitude. CONCLUSION Together, these observations support an involvement of the MCH system in regulation of energy balance as well as mediation of sucrose reward. MCH may be an important regulator of sugar intake by acting on both caloric and rewarding components.
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Kretowicz M, Johnson RJ, Ishimoto T, Nakagawa T, Manitius J. The impact of fructose on renal function and blood pressure. Int J Nephrol 2011; 2011:315879. [PMID: 21792388 PMCID: PMC3139867 DOI: 10.4061/2011/315879] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 06/17/2011] [Accepted: 06/17/2011] [Indexed: 12/14/2022] Open
Abstract
Fructose is a sugar present in sucrose, high-fructose corn syrup, honey, and fruits. Fructose intake has increased markedly in the last two centuries, primarily due to increased intake of added sugars. Increasing evidence suggests that the excessive intake of fructose may induce fatty liver, insulin resistance, dyslipidemia, hypertension, and kidney disease. These studies suggest that excessive intake of fructose might have an etiologic role in the epidemic of obesity, diabetes, and cardiorenal disease.
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Affiliation(s)
- Marek Kretowicz
- Department of Nephrology, Hypertension and Internal Medicine, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Toruń, ul. Skłodowskiej-Curie 9, 85-094 Bydgoszcz, Poland
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Bello NT, Patinkin ZW, Moran TH. Opioidergic consequences of dietary-induced binge eating. Physiol Behav 2011; 104:98-104. [PMID: 21539852 DOI: 10.1016/j.physbeh.2011.04.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 04/22/2011] [Indexed: 12/30/2022]
Abstract
Endogenous opioids are involved in the hedonic aspects of eating. Opioid impairments and alterations have been implicated in the pathophysiology of bulimia nervosa and binge eating disorder. Specific contributions by Bartley G. Hoebel have furthered the understanding how cyclical caloric restriction and intermittent optional access to sugar solutions result in opioid-like forebrain neural alterations and dependency in rodents. The present study sought to investigate caudal brainstem and nodose ganglion mu-opioid receptor mRNA alterations in a rodent model of dietary-induced binge eating of sweetened fat (vegetable shortening blended with 10% sucrose). Five groups (n=7 or 8) of adult female Sprague Dawley rats were exposed to various dietary conditions for 6 weeks. As measured by in situ hybridization, there was reduced (approximately 25% from naive) mu-opioid receptor mRNA in the nucleus of the solitary tract (NTS) in the binge access group, which had intermittent calorie restriction and optional limited access to the sweetened fat. A similar reduction in expression was demonstrated in the continuous access group, which has unlimited optional sweetened fat and an obese phenotype. In the nodose ganglion, mu-opioid receptor mRNA was increased (approximately 30% from groups with sweetened fat access) in rats with intermittent caloric restriction alone. Our findings and the body of work from the Hoebel laboratory suggest that dietary-induced binge eating can consequentially alter opioidergic forebrain and hindbrain feeding-related neural pathways. Future work is needed to determine whether similar alterations are involved in the maintenance and progression of binge eating and other related eating pathologies.
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Affiliation(s)
- Nicholas T Bello
- Department of Animal Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA.
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Carr KD. Food scarcity, neuroadaptations, and the pathogenic potential of dieting in an unnatural ecology: binge eating and drug abuse. Physiol Behav 2011; 104:162-7. [PMID: 21530562 DOI: 10.1016/j.physbeh.2011.04.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Accepted: 04/19/2011] [Indexed: 12/31/2022]
Abstract
In the laboratory, food restriction has been shown to induce neuroadaptations in brain reward circuitry which are likely to be among those that facilitate survival during periods of food scarcity in the wild. However, the upregulation of mechanisms that promote foraging and reward-related learning may pose a hazard when food restriction is self-imposed in an ecology of abundant appetitive rewards. For example, episodes of loss of control during weight-loss dieting, use of drugs with addictive potential as diet aids, and alternating fasting with alcohol consumption in order to avoid weight gain, may induce synaptic plasticity that increases the risk of enduring maladaptive reward-directed behavior. In the present mini-review, representative basic research findings are outlined which indicate that food restriction alters the function of mesoaccumbens dopamine neurons, potentiates cellular and behavioral responses to D-1 and D-2 dopamine receptor stimulation, and increases stimulus-induced synaptic insertion of AMPA receptors in nucleus accumbens. Possible mechanistic underpinnings of increased drug reward magnitude, drug-seeking, and binge intake of sucrose in food-restricted animal subjects are discussed and possible implications for human weight-loss dieting are considered.
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Affiliation(s)
- Kenneth D Carr
- Department of Psychiatry, Millhauser Laboratories, New York University School of Medicine, 550 First Ave., New York, NY 10016, USA.
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Dopamine and binge eating behaviors. Pharmacol Biochem Behav 2010; 97:25-33. [PMID: 20417658 DOI: 10.1016/j.pbb.2010.04.016] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Revised: 03/23/2010] [Accepted: 04/19/2010] [Indexed: 01/15/2023]
Abstract
Central dopaminergic mechanisms are involved in the motivational aspects of eating and food choices. This review focuses on human and animal data investigating the importance of dopamine on binge eating behaviors. Early work examining dopamine metabolites in the cerebrospinal fluid and plasma of bulimic individuals suggested decreased dopamine turnover during the active phase of the illness. While neuroimaging studies of dopamine mechanisms in bulimia nervosa (BN) and binge eating disorder (BED) are limited, genetic studies in humans have implicated an increased frequency of dopamine transporter and associated D2 receptor polymorphisms with binge pathology. Recent studies in rodent models of dietary-induced binge eating (DIBE) have investigated plausible dopamine mechanisms involved in sustaining binge eating behaviors. In DIBE models, highly palatable foods (fats, sugars and their combination), as well as restricted access conditions appear to promote ingestive responses and result in sustained dopamine stimulation within the nucleus accumbens. Taken together with studies on the comorbidity of illicit drug use and eating disorders, the data reviewed here support a role for dopamine in perpetuating the compulsive feeding patterns of BN and BED. As such, we propose that sustained stimulation of the dopamine systems by bingeing promoted by preexisting conditions (e.g., genetic traits, dietary restraint, stress, etc.) results in progressive impairments of dopamine signaling. To disrupt this vicious cycle, novel research-based treatment options aiming at the neural substrates of compulsive eating patterns are necessary.
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Bocarsly ME, Powell ES, Avena NM, Hoebel BG. High-fructose corn syrup causes characteristics of obesity in rats: increased body weight, body fat and triglyceride levels. Pharmacol Biochem Behav 2010; 97:101-6. [PMID: 20219526 DOI: 10.1016/j.pbb.2010.02.012] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2009] [Revised: 02/01/2010] [Accepted: 02/21/2010] [Indexed: 11/25/2022]
Abstract
High-fructose corn syrup (HFCS) accounts for as much as 40% of caloric sweeteners used in the United States. Some studies have shown that short-term access to HFCS can cause increased body weight, but the findings are mixed. The current study examined both short- and long-term effects of HFCS on body weight, body fat, and circulating triglycerides. In Experiment 1, male Sprague-Dawley rats were maintained for short term (8 weeks) on (1) 12 h/day of 8% HFCS, (2) 12 h/day 10% sucrose, (3) 24 h/day HFCS, all with ad libitum rodent chow, or (4) ad libitum chow alone. Rats with 12-h access to HFCS gained significantly more body weight than animals given equal access to 10% sucrose, even though they consumed the same number of total calories, but fewer calories from HFCS than sucrose. In Experiment 2, the long-term effects of HFCS on body weight and obesogenic parameters, as well as gender differences, were explored. Over the course of 6 or 7 months, both male and female rats with access to HFCS gained significantly more body weight than control groups. This increase in body weight with HFCS was accompanied by an increase in adipose fat, notably in the abdominal region, and elevated circulating triglyceride levels. Translated to humans, these results suggest that excessive consumption of HFCS may contribute to the incidence of obesity.
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Affiliation(s)
- Miriam E Bocarsly
- Department of Psychology, Princeton University, Princeton, NJ 08540, USA
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Johnson RJ, Perez-Pozo SE, Sautin YY, Manitius J, Sanchez-Lozada LG, Feig DI, Shafiu M, Segal M, Glassock RJ, Shimada M, Roncal C, Nakagawa T. Hypothesis: could excessive fructose intake and uric acid cause type 2 diabetes? Endocr Rev 2009; 30:96-116. [PMID: 19151107 PMCID: PMC2647706 DOI: 10.1210/er.2008-0033] [Citation(s) in RCA: 328] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2008] [Accepted: 12/31/2008] [Indexed: 02/07/2023]
Abstract
We propose that excessive fructose intake (>50 g/d) may be one of the underlying etiologies of metabolic syndrome and type 2 diabetes. The primary sources of fructose are sugar (sucrose) and high fructose corn syrup. First, fructose intake correlates closely with the rate of diabetes worldwide. Second, unlike other sugars, the ingestion of excessive fructose induces features of metabolic syndrome in both laboratory animals and humans. Third, fructose appears to mediate the metabolic syndrome in part by raising uric acid, and there are now extensive experimental and clinical data supporting uric acid in the pathogenesis of metabolic syndrome. Fourth, environmental and genetic considerations provide a potential explanation of why certain groups might be more susceptible to developing diabetes. Finally, we discuss the counterarguments associated with the hypothesis and a potential explanation for these findings. If diabetes might result from excessive intake of fructose, then simple public health measures could have a major impact on improving the overall health of our populace.
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Affiliation(s)
- Richard J Johnson
- Division of Nephrology, Hypertension and Transplantation, University of Florida, P.O. Box 100224, Gainesville, Florida 32620-0224, USA.
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