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Competing paradigms of obesity pathogenesis: energy balance versus carbohydrate-insulin models. Eur J Clin Nutr 2022; 76:1209-1221. [PMID: 35896818 PMCID: PMC9436778 DOI: 10.1038/s41430-022-01179-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 06/24/2022] [Accepted: 06/28/2022] [Indexed: 02/07/2023]
Abstract
The obesity pandemic continues unabated despite a persistent public health campaign to decrease energy intake (“eat less”) and increase energy expenditure (“move more”). One explanation for this failure is that the current approach, based on the notion of energy balance, has not been adequately embraced by the public. Another possibility is that this approach rests on an erroneous paradigm. A new formulation of the energy balance model (EBM), like prior versions, considers overeating (energy intake > expenditure) the primary cause of obesity, incorporating an emphasis on “complex endocrine, metabolic, and nervous system signals” that control food intake below conscious level. This model attributes rising obesity prevalence to inexpensive, convenient, energy-dense, “ultra-processed” foods high in fat and sugar. An alternative view, the carbohydrate-insulin model (CIM), proposes that hormonal responses to highly processed carbohydrates shift energy partitioning toward deposition in adipose tissue, leaving fewer calories available for the body’s metabolic needs. Thus, increasing adiposity causes overeating to compensate for the sequestered calories. Here, we highlight robust contrasts in how the EBM and CIM view obesity pathophysiology and consider deficiencies in the EBM that impede paradigm testing and refinement. Rectifying these deficiencies should assume priority, as a constructive paradigm clash is needed to resolve long-standing scientific controversies and inform the design of new models to guide prevention and treatment. Nevertheless, public health action need not await resolution of this debate, as both models target processed carbohydrates as major drivers of obesity.
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Ludwig DS, Aronne LJ, Astrup A, de Cabo R, Cantley LC, Friedman MI, Heymsfield SB, Johnson JD, King JC, Krauss RM, Lieberman DE, Taubes G, Volek JS, Westman EC, Willett WC, Yancy WS, Ebbeling CB. The carbohydrate-insulin model: a physiological perspective on the obesity pandemic. Am J Clin Nutr 2021; 114:1873-1885. [PMID: 34515299 PMCID: PMC8634575 DOI: 10.1093/ajcn/nqab270] [Citation(s) in RCA: 122] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 07/26/2021] [Indexed: 12/29/2022] Open
Abstract
According to a commonly held view, the obesity pandemic is caused by overconsumption of modern, highly palatable, energy-dense processed foods, exacerbated by a sedentary lifestyle. However, obesity rates remain at historic highs, despite a persistent focus on eating less and moving more, as guided by the energy balance model (EBM). This public health failure may arise from a fundamental limitation of the EBM itself. Conceptualizing obesity as a disorder of energy balance restates a principle of physics without considering the biological mechanisms that promote weight gain. An alternative paradigm, the carbohydrate-insulin model (CIM), proposes a reversal of causal direction. According to the CIM, increasing fat deposition in the body-resulting from the hormonal responses to a high-glycemic-load diet-drives positive energy balance. The CIM provides a conceptual framework with testable hypotheses for how various modifiable factors influence energy balance and fat storage. Rigorous research is needed to compare the validity of these 2 models, which have substantially different implications for obesity management, and to generate new models that best encompass the evidence.
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Affiliation(s)
- David S Ludwig
- New Balance Foundation Obesity Prevention Center, Boston Children's Hospital, Boston, MA, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA, USA
- Department of Nutrition, Harvard TH Chan School of Public Health, Boston, MA, USA
| | - Louis J Aronne
- Comprehensive Weight Control Center, Weill Cornell Medicine, New York, NY, USA
| | - Arne Astrup
- Department of Nutrition, Exercise, and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Rafael de Cabo
- Translational Gerontology Branch, National Institute on Aging, NIH, Baltimore, MD, USA
| | - Lewis C Cantley
- Department of Medicine, Weill Cornell Medicine, New York, NY, USA
| | - Mark I Friedman
- Monell Chemical Senses Center, Philadelphia, PA, USA
- Nutrition Science Initiative, San Diego, CA, USA
| | - Steven B Heymsfield
- Metabolism & Body Composition Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA, USA
| | - James D Johnson
- Diabetes Research Group, Life Sciences Institute, University of British Columbia, Vancouver, British Columbia, Canada
- Institute for Personalized Therapeutic Nutrition, Vancouver, British Columbia, Canada
| | - Janet C King
- Department of Nutritional Sciences & Toxicology, University of California Berkeley, Berkeley, CA, USA
| | - Ronald M Krauss
- Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA
- Department of Medicine, University of California San Francisco, San Francisco, CA, USA
| | - Daniel E Lieberman
- Department of Human Evolutionary Biology, Harvard University, Cambridge, MA, USA
| | - Gary Taubes
- Nutrition Science Initiative, San Diego, CA, USA
| | - Jeff S Volek
- Department of Human Sciences, Ohio State University, Columbus, OH, USA
| | - Eric C Westman
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
| | - Walter C Willett
- Department of Nutrition, Harvard TH Chan School of Public Health, Boston, MA, USA
- Channing Division of Network Medicine, Brigham and Women's Hospital, Boston, MA, USA
| | - William S Yancy
- Department of Medicine, Duke University School of Medicine, Durham, NC, USA
| | - Cara B Ebbeling
- New Balance Foundation Obesity Prevention Center, Boston Children's Hospital, Boston, MA, USA
- Department of Pediatrics, Harvard Medical School, Boston, MA, USA
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El Mostafi H, Elhessni A, Touil T, Ouichou A, Laaziz A, Doumar H, Mesfioui A. Argan oil supplementation attenuates voluntary ethanol consumption and withdrawal syndrome promoted by adolescent intermittent ethanol in rat. Alcohol 2020; 87:39-50. [PMID: 32353590 DOI: 10.1016/j.alcohol.2020.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 04/17/2020] [Accepted: 04/20/2020] [Indexed: 12/20/2022]
Abstract
The present study investigates the potential neuroprotective effect of argan oil (AO), a natural vegetable oil, commonly used in folk Moroccan medicines, on adolescent intermittent ethanol intoxication (IEI), induced voluntary ethanol consumption, and withdrawal syndrome in rats. Animals were treated with ethanol (intraperitoneally [i.p.], 3 g/kg body weight [bw]) in intermittent doses (2 days on; 2 days off, from postnatal day 30-43), with/without oral AO pre-treatment (10 mL/kg/day bw, from postnatal day 21-121). A 2-bottle free access test was performed over 10 weeks to assess 10% ethanol consumption. Behavioral signs of withdrawal were observed after 2, 6, 24, 48, and 72 h after ethanol removal. Anxiety-like behaviors in the elevated plus maze and the light/dark box tests were also evaluated at 72 h of withdrawal. We found that AO pre-treatment significantly decreased the voluntary ethanol consumption induced by adolescent IEI. In addition, by establishing low ethanol consumption, AO pre-treatment counteracts negative effects of ethanol withdrawal and anxiety-like behaviors in ethanol-treated rats after 72 h of abstinence. Following behavioral assays, oxidative stress markers were evaluated and histologic analysis of neurodegeneration was also performed. The results showed that the low ethanol drinking in the AO-supplemented rats was associated with inhibition of oxidative stress and neurodegeneration in the rats' brains. These findings provide evidence for the promising neuroprotective effect of AO supplementation in voluntary ethanol consumption and withdrawal syndrome, at least in part through counteracting oxidative stress markers and neurodegeneration.
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Zhang X, Xue C, Xu Q, Zhang Y, Li H, Li F, Liu Y, Guo C. Caprylic acid suppresses inflammation via TLR4/NF-κB signaling and improves atherosclerosis in ApoE-deficient mice. Nutr Metab (Lond) 2019; 16:40. [PMID: 31182969 PMCID: PMC6555760 DOI: 10.1186/s12986-019-0359-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Accepted: 05/01/2019] [Indexed: 12/23/2022] Open
Abstract
Background As reported previously by our group, medium-chain triglycerides can ameliorate atherosclerosis. Given that TLR4 is closely related to atherosclerosis, we hypothesized herein that caprylic acid (C8:0) would suppress inflammation via TLR4/NF-κB signaling and further promote the amelioration of atherosclerosis in apoE- deficient (apoE-/-) mice. Methods Fifty 6-week male apoE-/- mice were randomly allocated into five diet groups: a high-fat diet (HFD) without or with 2% caprylic acid (C8:0), capric acid (C10:0), stearic acid (C18:0), or linolenic acid (C18:3). RAW246.7 cells were treated with caprylic acid (C8:0), docosahexenoic acid (DHA), palmitic acid (C16:0), and lipopolysaccharide (LPS) with or without TLR4 knock-down (TLR4-KD). The serum lipid profiles, inflammatory biomolecules, and mRNA and protein expression levels were measured. Atherosclerotic lesions that occurred in the aorta and aortic sinuses were evaluated and quantified. Results Our results indicated that C8:0 reduced body fat, improved the lipid profiles, suppressed inflammatory cytokine production, downregulated aortic TLR4, MyD88, NF-κB, TNF-α, IKKα, and IKKβ mRNA expression, and alleviated atherosclerosis in the apoE-/- mice (P < 0.05). In RAW 264.7 cells, C8:0 diminished the inflammatory response and both mRNA and protein expression of TLR4, MyD88, NF-κB, and TNF-α compared to those in the LPS and C16:0 groups (P < 0.05). However, in the TLR4-KD RAW 264.7 cells, C8:0 significantly upregulated NF-κB mRNA and protein expression compared to those in the C16:0 and DHA groups. Conclusions These results suggest that C8:0 functions via TLR4/NF-κB signaling to improve the outcomes of apoE-/- mice through suppressing inflammation and ameliorating atherosclerosis. Thus, C8:0 may represent as a promising nutrient against chronic inflammatory diseases.
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Affiliation(s)
- Xinsheng Zhang
- Department of Nutrition, Tianjin Institute of Environmental & Operational Medicine, Tianjin, 300050 China.,2Department of Nutrition, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Changyong Xue
- 2Department of Nutrition, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Qing Xu
- 2Department of Nutrition, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Yong Zhang
- 2Department of Nutrition, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Huizi Li
- 3Department of Nutrition, PLA Rocket Force Characteristic Medical Center, Beijing, 100088 China
| | - Feng Li
- 4Department of Nutrition, Air Force Medical Center, PLA, Beijing, 100142 China
| | - Yinghua Liu
- 2Department of Nutrition, Chinese PLA General Hospital, 28 Fuxing Road, Beijing, 100853 China
| | - Changjiang Guo
- Department of Nutrition, Tianjin Institute of Environmental & Operational Medicine, Tianjin, 300050 China
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Alfaidi MA, Chamberlain J, Rothman A, Crossman D, Villa-Uriol MC, Hadoke P, Wu J, Schenkel T, Evans PC, Francis SE. Dietary Docosahexaenoic Acid Reduces Oscillatory Wall Shear Stress, Atherosclerosis, and Hypertension, Most Likely Mediated via an IL-1-Mediated Mechanism. J Am Heart Assoc 2018; 7:e008757. [PMID: 29960988 PMCID: PMC6064924 DOI: 10.1161/jaha.118.008757] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 05/30/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Hypertension is a complex condition and a common cardiovascular risk factor. Dietary docosahexaenoic acid (DHA) modulates atherosclerosis and hypertension, possibly via an inflammatory mechanism. IL-1 (interleukin 1) has an established role in atherosclerosis and inflammation, although whether IL-1 inhibition modulates blood pressure is unclear. METHODS AND RESULTS Male apoE-/- (apolipoprotein E-null) mice were fed either a high fat diet or a high fat diet plus DHA (300 mg/kg per day) for 12 weeks. Blood pressure and cardiac function were assessed, and effects of DHA on wall shear stress and atherosclerosis were determined. DHA supplementation improved left ventricular function, reduced wall shear stress and oscillatory shear at ostia in the descending aorta, and significantly lowered blood pressure compared with controls (119.5±7 versus 159.7±3 mm Hg, P<0.001, n=4 per group). Analysis of atheroma following DHA feeding in mice demonstrated a 4-fold reduction in lesion burden in distal aortas and in brachiocephalic arteries (P<0.001, n=12 per group). In addition, DHA treatment selectively decreased plaque endothelial IL-1β (P<0.01). CONCLUSIONS Our findings revealed that raised blood pressure can be reduced by inhibiting IL-1 indirectly by administration of DHA in the diet through a mechanism that involves a reduction in wall shear stress and local expression of the proinflammatory cytokine IL-1β.
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Affiliation(s)
- Mabruka A Alfaidi
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, United Kingdom
| | - Janet Chamberlain
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, United Kingdom
| | - Alexander Rothman
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, United Kingdom
| | | | - Maria-Cruz Villa-Uriol
- INSIGNEO Institute for in silico Medicine & Department of Computer Science, University of Sheffield, United Kingdom
| | - Patrick Hadoke
- BHF Centre of Excellence, University of Edinburgh, United Kingdom
| | - Junxi Wu
- BHF Centre of Excellence, University of Edinburgh, United Kingdom
| | - Torsten Schenkel
- Department of Engineering and Mathematics, Hallam University, Sheffield, United Kingdom
| | - Paul C Evans
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, United Kingdom
| | - Sheila E Francis
- Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield, United Kingdom
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Rodrigues AH, Moreira CCL, Neves MJ, Botion LM, Chaves VE. Replacement of soybean oil by fish oil increases cytosolic lipases activities in liver and adipose tissue from rats fed a high-carbohydrate diets. J Nutr Biochem 2018; 56:74-80. [DOI: 10.1016/j.jnutbio.2018.01.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 12/18/2017] [Accepted: 01/16/2018] [Indexed: 12/12/2022]
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Alshahrani A, Bin Khunayfir A, Al Rayih M, Al Sayed H, Alsadoon A, Al Dubayee M, Zahra M, Alrumayyan Y, Al Zayer M, Nasr A, Aljada A. Phenotypic Characterization of Human Monocytes following Macronutrient Intake in Healthy Humans. Front Immunol 2017; 8:1293. [PMID: 29109719 PMCID: PMC5660602 DOI: 10.3389/fimmu.2017.01293] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Accepted: 09/26/2017] [Indexed: 01/04/2023] Open
Abstract
Background Three subsets of human monocytes in circulation have been identified and their characterization is still ill-defined. Although glucose and lipid intakes have been demonstrated to exert pro-inflammatory effects on mononuclear cells (MNCs) of healthy subjects, characterization of monocytes phenotypes following macronutrient (glucose, protein, and lipid) intake in humans remains to be determined. Methods Thirty-six healthy, normal weight volunteers were recruited in the study. Subjects were randomly assigned into three groups, each group consisting of 12 participants. Each group drank equal calories (300 kcal) of either glucose or lipids or whey proteins. Each subject served as his own control by drinking 300 mL of water 1 week before or after the caloric intake. Baseline blood samples were drawn at 0, 1, 2, and 3-h intervals post caloric or water intakes. MNCs were isolated, and the expression levels of different cluster of differentiation (CD) markers (CD86, CD11c, CD169, CD206, CD163, CD36, CD68, CD11b, CD16, and CD14) and IL-6 were measured by RT-qPCR. Results Equicaloric intake of either glucose or lipids or whey proteins resulted in different monocyte phenotypes as demonstrated by changes in the expression levels of CD and polarization markers. Whey proteins intake resulted in significant mRNA upregulation in MNCs of CD68 and CD11b at 1, 2, and 3 h post intake while mRNA of IL-6 was significantly inhibited at 1 h. Lipids intake, on the other hand, resulted in mRNA upregulation of CD11b at 2 and 3 h and CD206 at 1, 2, and 3 h. There were no significant changes in the other CD markers measured (CD86, CD163, CD169, CD36, CD16, and CD14) following either whey proteins or lipids intakes. Glucose intake did not alter mRNA expression of any marker tested except CD206 at 3 h. Conclusion Macronutrient intake alters the expression levels of polarization markers in MNCs of human subjects. A distinct population of different monocytes phenotypes may result in human circulation following the intake of different macronutrients. Further studies are required to characterize the immunomodulatory effects of macronutrients intake on monocytes phenotypes and their characteristics in humans.
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Affiliation(s)
- Awad Alshahrani
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Abdalmalik Bin Khunayfir
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Mohammed Al Rayih
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Hasan Al Sayed
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Abdullah Alsadoon
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Mohammed Al Dubayee
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Mahmoud Zahra
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Yousof Alrumayyan
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Maha Al Zayer
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Amre Nasr
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Ahmad Aljada
- Department of Basic Medical Sciences, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.,King Abdullah International Medical Research Center (KAIMRC), Ministry of National Guard Health Affairs (MNGHA), Riyadh, Saudi Arabia
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Khaire A, Rathod R, Kale A, Joshi S. Vitamin B 12 Deficiency Across Three Generations Adversely Influences Long-chain Polyunsaturated Fatty Acid Status and Cardiometabolic Markers in Rats. Arch Med Res 2017; 47:427-435. [PMID: 27986122 DOI: 10.1016/j.arcmed.2016.10.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 10/21/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIMS Vitamin B12 and omega-3 fatty acid deficiency is prevalent in the vegetarian population and is associated with adverse pregnancy outcomes and cardiometabolic risk. The present study investigates the long-term effects of vitamin B12 deficiency/supplementation in the presence of omega-3 fatty acids on cardiometabolic profile and long-chain polyunsaturated fatty acid levels (LCPUFA) in the F3 generation offspring. METHODS Three generations of rats were fed the following diets: control; vitamin B12 deficient; vitamin B12 supplemented; vitamin B12 deficient + omega-3 fatty acid supplemented; vitamin B12 + omega-3 fatty acid supplemented. Animals were sacrificed at 3 months of age. RESULTS Vitamin B12 deficiency lowered (p <0.01 for both) plasma eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), liver DHA (p <0.05), plasma/liver omega-3 fatty acids (p <0.05 for both), increased triglycerides (p <0.05) and systolic BP (p <0.01) and lowered cholesterol levels (p <0.05) as compared to control. Vitamin B12 deficiency in the presence of omega-3 fatty acids improved plasma/liver EPA, DHA and omega-3 fatty acid profile and maintained cholesterol, triglyceride and BP levels. Vitamin B12 supplementation lowered liver DHA (p <0.05) and cholesterol (p <0.01), whereas BP was similar to control. Combined supplementation of vitamin B12 and omega-3 fatty acids improved omega-3 fatty acid profile, lowered cholesterol/triglyceride levels and maintained the BP similar to that of control. CONCLUSION Vitamin B12 deficiency across three generations adversely affects LCPUFA and cardiometabolic profile in the adult offspring. This study provides clues for a combined supplementation of vitamin B12 and omega-3 fatty acids to reduce the risk for noncommunicable diseases.
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Affiliation(s)
- Amrita Khaire
- Department of Nutritional Medicine, Interactive Research School for Health Affairs, Bharati Vidyapeeth Deemed University, Pune, India
| | - Richa Rathod
- Department of Nutritional Medicine, Interactive Research School for Health Affairs, Bharati Vidyapeeth Deemed University, Pune, India
| | - Anvita Kale
- Department of Nutritional Medicine, Interactive Research School for Health Affairs, Bharati Vidyapeeth Deemed University, Pune, India
| | - Sadhana Joshi
- Department of Nutritional Medicine, Interactive Research School for Health Affairs, Bharati Vidyapeeth Deemed University, Pune, India.
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Bargut TCL, Mandarim-de-Lacerda CA, Aguila MB. A high-fish-oil diet prevents adiposity and modulates white adipose tissue inflammation pathways in mice. J Nutr Biochem 2015; 26:960-9. [DOI: 10.1016/j.jnutbio.2015.04.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 03/31/2015] [Accepted: 04/02/2015] [Indexed: 12/22/2022]
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Greco L, Neto J, Pedrico A, Ferrazza R, Lima F, Bisinotto R, Martinez N, Garcia M, Ribeiro E, Gomes G, Shin J, Ballou M, Thatcher W, Staples C, Santos J. Effects of altering the ratio of dietary n-6 to n-3 fatty acids on performance and inflammatory responses to a lipopolysaccharide challenge in lactating Holstein cows. J Dairy Sci 2015; 98:602-17. [DOI: 10.3168/jds.2014-8805] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 09/20/2014] [Indexed: 01/10/2023]
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Bousalham R, Rhazali LJ, Harmouch A, Lotfi H, Benazzouz B, Hessni AE, Ouichou A, Akhouayri O, Mesfioui A. Does Argan Oil Supplementation Affect Metabolic Parameters and Behavior in Wistar Rats? ACTA ACUST UNITED AC 2015. [DOI: 10.4236/fns.2015.69085] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Meidenbauer JJ, Ta N, Seyfried TN. Influence of a ketogenic diet, fish-oil, and calorie restriction on plasma metabolites and lipids in C57BL/6J mice. Nutr Metab (Lond) 2014; 11:23. [PMID: 24910707 PMCID: PMC4047269 DOI: 10.1186/1743-7075-11-23] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 05/06/2014] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Diet therapies including calorie restriction, ketogenic diets, and fish-oil supplementation have been used to improve health and to treat a variety of neurological and non-neurological diseases. METHODS We investigated the effects of three diets on circulating plasma metabolites (glucose and β-hydroxybutyrate), hormones (insulin and adiponectin), and lipids over a 32-day period in C57BL/6J mice. The diets evaluated included a standard rodent diet (SD), a ketogenic diet (KD), and a standard rodent diet supplemented with fish-oil (FO). Each diet was administered in either unrestricted (UR) or restricted (R) amounts to reduce body weight by 20%. RESULTS The KD-UR increased body weight and glucose levels and promoted a hyperlipidemic profile, whereas the FO-UR decreased body weight and glucose levels and promoted a normolipidemic profile, compared to the SD-UR. When administered in restricted amounts, all three diets produced a similar plasma metabolite profile, which included decreased glucose levels and a normolipidemic profile. Linear regression analysis showed that circulating glucose most strongly predicted body weight and triglyceride levels, whereas calorie intake moderately predicted glucose levels and strongly predicted ketone body levels. CONCLUSIONS These results suggest that biomarkers of health can be improved when diets are consumed in restricted amounts, regardless of macronutrient composition.
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Affiliation(s)
| | - Nathan Ta
- Biology Department, Boston College, Chestnut Hill, MA 02467, USA
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Teng KT, Chang CY, Chang LF, Nesaretnam K. Modulation of obesity-induced inflammation by dietary fats: mechanisms and clinical evidence. Nutr J 2014; 13:12. [PMID: 24476102 PMCID: PMC3922162 DOI: 10.1186/1475-2891-13-12] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 01/13/2014] [Indexed: 01/16/2023] Open
Abstract
Obesity plays a pivotal role in the development of low-grade inflammation. Dietary fatty acids are important modulators of inflammatory responses. Saturated fatty acids (SFA) and n-6 polyunsaturated fatty acids (PUFA) have been reported to exert pro-inflammatory effects. n-3 PUFA in particular, possess anti-inflammatory properties. Numerous clinical studies have been conducted over decades to investigate the impact of dietary fatty acids on inflammatory response in obese individuals, however the findings remained uncertain. High fat meals have been reported to increase pro-inflammatory responses, however there is limited evidence to support the role of individual dietary fatty acids in a postprandial state. Evidence in chronic studies is contradictory, the effects of individual dietary fatty acids deserves further attention. Weight loss rather than n-3 PUFA supplementation may play a more prominent role in alleviating low grade inflammation. In this context, the present review provides an update on the mechanistic insight and the influence of dietary fats on low grade inflammation, based on clinical evidence from acute and chronic clinical studies in obese and overweight individuals.
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Affiliation(s)
- Kim-Tiu Teng
- Product Development and Advisory Services, Malaysian Palm Oil Board (MPOB), 6 Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia.
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Oral administration of alkylglycerols differentially modulates high-fat diet-induced obesity and insulin resistance in mice. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:834027. [PMID: 23864898 PMCID: PMC3705780 DOI: 10.1155/2013/834027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Accepted: 06/05/2013] [Indexed: 12/31/2022]
Abstract
Alkylglycerols (AKGs) from shark liver oil (SLO) were demonstrated to have strong potency to stimulate immune response. However, no study has been conducted on the effects of AKGs on diet-induced obesity and metabolic inflammatory disorder. The purpose of the present study was to investigate the effect of two AKGs isoforms on obesity and insulin resistance in mice fed high-fat (HF) diet. Forty-eight C57BL/6 mice were divided into normal, HF, HF + 20 mg/kg selachyl alcohol (SA), HF + 200 mg/kg SA, HF + 20 mg/kg batyl alcohol (BA), and HF + 200 mg/kg BA groups. Body weight, fasting glucose, lipids, insulin and leptin levels, serum IL-1β, and TNF-α levels were compared among different groups. Our results showed that high-dose SA decreased body weight, serum triglyceride, cholesterol, fasting glucose level, insulin level, and serum leptin level of the HF fed mice, while high-dose BA increased fasting insulin level of the HF fed mice. Pretreatment of primary adipocytes with 10 μM SA or BA differentially modulates LPS-mediated MAPK and NF-κB signaling. Our study demonstrated that oral administration of AKGs has differential effects on HF-induced obesity and metabolic inflammatory disorder in mice.
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Perna canaliculus lipid complex PCSO-524™ demonstrated pain relief for osteoarthritis patients benchmarked against fish oil, a randomized trial, without placebo control. Mar Drugs 2013; 11:1920-35. [PMID: 23739042 PMCID: PMC3721214 DOI: 10.3390/md11061920] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Revised: 05/08/2013] [Accepted: 05/21/2013] [Indexed: 01/16/2023] Open
Abstract
Osteoarthritis (OA) typically generates pain, reduced mobility and reduced quality of life. Most conventional treatments for osteoarthritis, such as non-steroidal anti-inflammatory drugs (NSAIDs) and simple analgesics, have side effects. PCSO-524™, a non polar lipid extract from the New Zealand Green Lipped Mussel, is rich in omega-3 fatty acids and has been shown to reduce inflammation in both animal studies and patient trials. This OA trial examined pain relief changes in relation to quality of life and safety of use for OA patients who took PCSO-524™ compared with patients who took fish oil (containing an industry standard EPA-18% and DHA-12% blend). PCSO-524™ patients showed a statistically significant improvement compared with patients who took fish oil. There was an 89% decrease in their pain symptoms and 91% reported an improved quality of life. Patients treated with fish oil showed significantly less improvement and a greater level of physical discomfort during the study. These results suggest that PCSO-524™ might offer a potential alternative complementary therapy with no side effects for OA patients.
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Dietary fat quality in regular fat diets has minor effects on biomarkers of inflammation in obese Zucker rats. Eur J Nutr 2013; 53:211-9. [DOI: 10.1007/s00394-013-0518-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 03/18/2013] [Indexed: 01/17/2023]
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Vasselli JR, Scarpace PJ, Harris RBS, Banks WA. Dietary components in the development of leptin resistance. Adv Nutr 2013; 4:164-75. [PMID: 23493533 PMCID: PMC3649097 DOI: 10.3945/an.112.003152] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Classically, leptin resistance has been associated with increased body fat and circulating leptin levels, and the condition is believed to contribute to the onset and/or maintenance of obesity. Although a great deal is known about the central nervous system mechanisms mediating leptin resistance, considerably less is known about the role of diet in establishing and maintaining this altered hormonal state. An exciting new finding has recently been published demonstrating the existence of leptin resistance in normal-weight rats with lean leptin levels by feeding them a high-concentration-fructose diet. This finding has opened the possibility that specific macronutrients may be capable of inducing leptin resistance, independently of the amount of body fat or circulating leptin present in the treated animals. This review describes several lines of research that have recently emerged indicating that specific types of dietary sugars and fats are capable of inducing leptin resistance in experimental rodent models. The results further show that diet-induced leptin resistance is capable of increasing energy intake and elevating body weight gain under appropriate dietary challenges. It appears that biological mechanisms on multiple levels may underlie the dietary induction of leptin resistance, including alterations in the leptin blood-to-brain transport system, in peripheral glucose metabolism, and in central leptin receptor signaling pathways. What is clear from the findings reviewed here is that diet-induced leptin resistance can occur in the absence of elevated circulating leptin levels and body weight, rendering it a potential cause and/or predisposing factor to excess body weight gain and obesity.
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Affiliation(s)
- Joseph R. Vasselli
- Nutrition Obesity Research Center, Department of Medicine, St. Luke’s-Roosevelt Hospital, and Columbia University Institute of Human Nutrition, New York, NY,To whom correspondence should be addressed. E-mail:
| | - Philip J. Scarpace
- Department of Pharmacology and Therapeutics, University of Florida, Gainesville, FL
| | - Ruth B. S. Harris
- Department of Physiology, Georgia Health Sciences University, Augusta, GA; and
| | - William A. Banks
- Division of Gerontology and Geriatric Medicine, Department of Medicine, Veterans Administration Geriatric Research Education and Clinical Center/University of Washington, Seattle, WA
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Hirabara SM, Folador A, Fiamoncini J, Lambertucci RH, Rodrigues CF, Rocha MS, Aikawa J, Yamazaki RK, Martins AR, Rodrigues AC, Carpinelli AR, Pithon-Curi TC, Fernandes LC, Gorjão R, Curi R. Fish oil supplementation for two generations increases insulin sensitivity in rats. J Nutr Biochem 2012; 24:1136-45. [PMID: 23246156 DOI: 10.1016/j.jnutbio.2012.08.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2012] [Revised: 08/13/2012] [Accepted: 08/20/2012] [Indexed: 11/26/2022]
Abstract
We investigated the effect of fish oil supplementation for two consecutive generations on insulin sensitivity in rats. After the nursing period (21 days), female rats from the same prole were divided into two groups: (a) control group and (b) fish oil group. Female rats were supplemented with water (control) or fish oil at 1 g/kg body weight as a single bolus for 3 months. After this period, female rats were mated with male Wistar rats fed on a balanced chow diet (not supplemented). Female rats continued to receive supplementation throughout gestation and lactation periods. The same treatment was performed for the next two generations (G1 and G2). At 75 days of age, male offspring from G1 and G2 generations from both groups were used in the experiments. G1 rats did not present any difference with control rats. However, G2 rats presented reduction in glycemia and lipidemia and improvement in in vivo insulin sensitivity (model assessment of insulin resistance, insulin tolerance test) as well as in vitro insulin sensitivity in soleus muscle (glucose uptake and metabolism). This effect was associated with increased insulin-stimulated p38 MAP kinase phosphorylation and lower n-6/n-3 fatty acid ratio, but not with activation of proteins from insulin signaling (IR, IRS-1 and Akt). Global DNA methylation was decreased in liver but not in soleus muscle. These results suggest that long-term fish oil supplementation improves insulin sensitivity in association with increased insulin-stimulated p38 activation and decreased n-6:n-3 ratio in skeletal muscle and decreased global DNA methylation in liver.
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Affiliation(s)
- Sandro M Hirabara
- Institute of Physical Activity Sciences and Sport, Cruzeiro do Sul University, São Paulo, Brazil.
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Neilson AP, Djuric Z, Ren J, Hong YH, Sen A, Lager C, Jiang Y, Reuven S, Smith WL, Brenner DE. Effect of cyclooxygenase genotype and dietary fish oil on colonic eicosanoids in mice. J Nutr Biochem 2011; 23:966-76. [PMID: 21937210 DOI: 10.1016/j.jnutbio.2011.05.003] [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: 01/20/2011] [Revised: 04/21/2011] [Accepted: 05/03/2011] [Indexed: 01/20/2023]
Abstract
Dietary ω3 fatty acids can modulate substrate availability for cyclooxygenases (COXs) and lipoxygenases, thus modulating downstream eicosanoid formation. This could be an alternative approach to using nonsteroidal anti-inflammatory drugs and other COX inhibitors for limiting Prostaglandin E(2) (PGE(2)) synthesis in colon cancer prevention. The aims of this study were to evaluate to what extent COX- and lipoxygenase-derived products could be modulated by dietary fish oil in normal colonic mucosa and to evaluate the role of COX-1 and COX-2 in the formation of these products. Mice (wild-type, COX-1 null or COX-2 null) were fed a diet supplying a broad mixture of fatty acids present in European/American diets, supplemented with either olive oil (oleate control diet) or menhaden (fish) oil ad libitum for 9-11 weeks. Colonic eicosanoid levels were measured by liquid chromatography tandem mass spectroscopy (LC-MS/MS), and proliferation was assessed by Ki67 immunohistochemistry. For the dietary alteration of colonic arachidonic acid: eicosapentaenoic ratios resulted in large shifts in formation of COX and lipoxygenase metabolites. COX-1 knockout virtually abolished PGE(2) formation, but interestingly, 12-hydroxyeicosatetraenoic (12-HETE) acid and 15-HETE formation was increased. The large changes in eicosanoid profiles were accompanied by relatively small changes in colonic crypt proliferation, but such changes in eicosanoid formation might have greater biological impact upon carcinogen challenge. These results indicate that in normal colon, inhibition of COX-2 would have little effect on reducing PGE(2) levels.
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Affiliation(s)
- Andrew P Neilson
- Department of Family Medicine, University of Michigan Medical School, University of Michigan, Ann Arbor, MI 48109, USA
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