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A Freshwater Fish-Based Diet Alleviates Liver Steatosis by Modulating Gut Microbiota and Metabolites: A Clinical Randomized Controlled Trial in Chinese Participants With Nonalcoholic Fatty Liver Disease.
He, K, Guo, LL, Tang, H, Peng, X, Li, J, Feng, S, Bie, C, Chen, W, Li, Y, Wang, M, et al
The American journal of gastroenterology. 2022;117(10):1621-1631
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The diagnosis and treatment of non-alcoholic fatty liver disease (NAFLD) is critical, however, there isn’t an effective treatment readily available. On the other hand, lifestyle modifications, particularly a calorie-restricted diet, habitual physical activity, and weight loss, have been advocated for the treatment of NAFLD. The hypothesis of this study was that a freshwater fish-based diet would induce a greater improvement in hepatic steatosis by regulating gut microbiota and its metabolites compared with an alternating combination of freshwater fish-based and red meat-based diets. This study was a randomised, open-label and controlled clinical trial which enrolled participants who were clinically diagnosed of NAFLD with a presence of hepatic steatosis. Participants (n=34) were randomly assigned to either a freshwater fish-based diet or the combination of a freshwater fish-based diet and a red meat-based diet at a daily alternating frequency in a 1:1 ratio. Results showed that dietary freshwater fish consumption: - alleviates liver steatosis in participants with NAFLD; - ameliorates several metabolic phenotypes in participants with NAFLD; - partially redresses gut microbiota dysbiosis in the improvement of the metabolic phenotypes of participants with NAFLD; - improves NAFLD by inducing metabolites alternation. Authors conclude that even though the freshwater fish-based diet showed various positive results for participants with NAFLD, the alternating freshwater fish and red meat consumption may not exacerbate NAFLD, which may be more appropriate to fit the daily eating habits and food diversity for long-term implementation.
Abstract
INTRODUCTION We aimed to assess the effects of 2 isoenergetic intervention diets (a freshwater fish-based diet [F group] or freshwater fish-based and red meat-based diets alternately [F/M group]) on liver steatosis and their relationship with intestinal flora in patients with nonalcoholic fatty liver disease (NAFLD). METHODS In this open-label, 84-day randomized controlled trial, 34 NAFLD patients with hepatic steatosis ≥10% were randomly assigned to the F group or F/M group in a 1:1 ratio using a computer-generated random number allocation by a researcher not involved in the study. Liver fat content and gut microbiota and its metabolites were measured. RESULTS At the end of intervention, the absolute reduction of hepatic steatosis was significantly greater in the F group than in the F/M group (-4.89% vs -1.83%, P = 0.032). Of the 16 secondary clinical outcomes, the improvement in 7 in the F group was greater compared with the F/M group, including alanine aminotransferase and gamma-glutamyl transferase. Furthermore, dietary freshwater fish and red meat consumption alternately did not exacerbate NAFLD. Moreover, changes in the enrichment of Faecalibacterium, short-chain fatty acids, and unconjugated bile acids and the depletion of Prevotella 9 and conjugated bile acids in the F group were significantly greater compared with the F/M group. DISCUSSION Higher intake of freshwater fish may be beneficial to NAFLD by regulating gut microbiota and its metabolites, whereas intake of a similar total of animal protein and fat from the alternating freshwater fish and red meat may not be harmful for NAFLD in the dietary management of patients with NAFLD.
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Nicotinamide Riboside Enhances In Vitro Beta-adrenergic Brown Adipose Tissue Activity in Humans.
Nascimento, EBM, Moonen, MPB, Remie, CME, Gariani, K, Jörgensen, JA, Schaart, G, Hoeks, J, Auwerx, J, van Marken Lichtenbelt, WD, Schrauwen, P
The Journal of clinical endocrinology and metabolism. 2021;106(5):1437-1447
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Brown fat is a type of fat that burns energy to regulate the body’s temperature in cold conditions. A high level of activity in the brown fat has been associated with healthy whole-body metabolism. Several supplements have been investigated for their potential to activate brown fat, however many of these have limiting side effects. Nicotinamide riboside (NR), also known as vitamin B3, is a supplement which can boost energy burning pathways within the body. This randomised control trial was part of a larger trial including a study on human brown fat cells and aimed to determine whether NR supplementation in overweight and obese individuals may act on the activity of brown tissue. The results showed that 6 weeks of NR supplementation had no effect on brown tissue activity or energy expenditure. It was concluded that NR supplementation for 6 weeks in individuals with obesity had no effect on brown fat tissue for reasons unknown, as the cellular study showed an increase in activity. This study could be used by healthcare professionals to better understand the role of brown fat in metabolism.
Abstract
CONTEXT Elevating nicotinamide adenine dinucleotide (NAD+) levels systemically improves metabolic health, which can be accomplished via nicotinamide riboside (NR). Previously, it was demonstrated that NR supplementation in high-fat-diet (HFD)-fed mice decreased weight gain, normalized glucose metabolism, and enhanced cold tolerance. OBJECTIVE Because brown adipose tissue (BAT) is a major source of thermogenesis, we hypothesize that NR stimulates BAT in mice and humans. DESIGN AND INTERVENTION HFD-fed C56BL/6J mice were supplemented with 400 mg/kg/day NR for 4 weeks and subsequently exposed to cold. In vitro primary adipocytes derived from human BAT biopsies were pretreated with 50 µM or 500 µM NR before measuring mitochondrial uncoupling. Human volunteers (45-65 years; body mass index, 27-35 kg/m2) were supplemented with 1000 mg/day NR for 6 weeks to determine whether BAT activity increased, as measured by [18F]FDG uptake via positron emission tomography-computed tomography (randomized, double blinded, placebo-controlled, crossover study with NR supplementation). RESULTS NR supplementation in HFD-fed mice decreased adipocyte cell size in BAT. Cold exposure further decreased adipocyte cell size on top of that achieved by NR alone independent of ex vivo lipolysis. In adipocytes derived from human BAT, NR enhanced in vitro norepinephrine-stimulated mitochondrial uncoupling. However, NR supplementation in human volunteers did not alter BAT activity or cold-induced thermogenesis. CONCLUSIONS NR stimulates in vitro human BAT but not in vivo BAT in humans. Our research demonstrates the need for further translational research to better understand the differences in NAD+ metabolism in mouse and human.
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NAD+-Precursor Supplementation With L-Tryptophan, Nicotinic Acid, and Nicotinamide Does Not Affect Mitochondrial Function or Skeletal Muscle Function in Physically Compromised Older Adults.
Connell, NJ, Grevendonk, L, Fealy, CE, Moonen-Kornips, E, Bruls, YMH, Schrauwen-Hinderling, VB, de Vogel, J, Hageman, R, Geurts, J, Zapata-Perez, R, et al
The Journal of nutrition. 2021;151(10):2917-2931
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Ageing is associated with the progressive loss of muscle, which can result in impaired movement, an increased risk for falls and disrupted energy production. During ageing there is a decrease in one of the substrates involved in producing energy known as NAD+. Studies in animals have shown that supplementing with a precursor of NAD+ promotes longevity and energy production. In humans supplementation with a precursor of NAD+ has been shown to improve heart health and be of benefit to individuals with obesity. This randomised control trial aimed to determine the effect of supplementing the NAD+ precursors, tryptophan, nicotinic acid, and nicotinamide on muscle function in 14 older adults with impaired physical function. The results showed that supplementation had no effect on NAD+ and had no effect on muscular energy production nor exercise performance following a cycling test. It was concluded that supplementation with an NAD+ precursor does not improve muscle function. This study could be used by healthcare professionals to understand that a combination supplement of tryptophan, nicotinic acid, and nicotinamide may not benefit the physical function of older adults.
Abstract
BACKGROUND Boosting NAD+ via supplementation with niacin equivalents has been proposed as a potential modality capable of promoting healthy aging and negating age-dependent declines of skeletal muscle mass and function. OBJECTIVES We investigated the efficacy of NAD+-precursor supplementation (tryptophan, nicotinic acid, and nicotinamide) on skeletal muscle mitochondrial function in physically compromised older adults. METHODS A randomized, double-blind, controlled trial was conducted in 14 (female/male: 4/10) community-dwelling, older adults with impaired physical function [age, 72.9 ± 4.0 years; BMI, 25.2 ± 2.3 kg/m2]. Participants were supplemented with 207.5 mg niacin equivalents/day [intervention (INT)] and a control product (CON) that did not contain niacin equivalents, each for 32 days. The primary outcomes tested were mitochondrial oxidative capacity and exercise efficiency, analyzed by means of paired Student's t-tests. Secondary outcomes, such as NAD+ concentrations, were analyzed accordingly. RESULTS Following supplementation, skeletal muscle NAD+ concentrations [7.5 ± 1.9 compared with 7.9 ± 1.6 AU, respectively] in INT compared with CON conditions were not significantly different compared to the control condition, whereas skeletal muscle methyl-nicotinamide levels were significantly higher under NAD+-precursor supplementation [INT, 0.098 ± 0.063 compared with CON, 0.025 ± 0.014; P = 0.001], suggesting an increased NAD+ metabolism. Conversely, neither ADP-stimulated [INT, 82.1 ± 19.0 compared with CON, 84.0 ± 19.2; P = 0.716] nor maximally uncoupled mitochondrial respiration [INT, 103.4 ± 30.7 compared with CON, 108.7 ± 33.4; P = 0.495] improved under NAD+-precursor supplementation, nor did net exercise efficiency during the submaximal cycling test [INT, 20.2 ± 2.77 compared with CON, 20.8 ± 2.88; P = 0.342]. CONCLUSIONS Our findings are consistent with previous findings on NAD+ efficacy in humans, and we show in community-dwelling, older adults with impaired physical function that NAD+-precursor supplementation through L-tryptophan, nicotinic acid, and nicotinamide does not improve mitochondrial or skeletal muscle function. This study was registered at clinicaltrials.gov as NCT03310034.
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Effect of a Low Free Sugar Diet vs Usual Diet on Nonalcoholic Fatty Liver Disease in Adolescent Boys: A Randomized Clinical Trial.
Schwimmer, JB, Ugalde-Nicalo, P, Welsh, JA, Angeles, JE, Cordero, M, Harlow, KE, Alazraki, A, Durelle, J, Knight-Scott, J, Newton, KP, et al
JAMA. 2019;321(3):256-265
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The prevalence of non-alcoholic fatty liver disease (NAFLD) among children in the United States is increasing and evidence supports a role for dietary sugar in the development and progression of NAFLD. This open-label, randomised clinical trial using a feeding study design was performed to test the hypothesis that restricting free sugar would improve NAFLD in children. Children in the intervention group, who were provided all food for the 8 week intervention, received less than 3% of daily calories from sugar. The control group continued with their usual diet. Study visits were conducted at baseline and at 4 and 8 weeks after start of the intervention. The mean decrease in hepatic steatosis (a sign of NAFLD) from baseline to week 8 was significantly greater for the intervention diet group compared with the usual diet group. Liver enzymes, total cholesterol, weight/body mass index and systolic blood pressure also improved more in the low sugar group than in the usual diet group. There was no difference in markers for blood sugar control and other lipid parameters. The authors conclude that these findings suggest a potential benefit of a low sugar diet for children with NAFLD, but state that further research is needed to assess long-term and clinical outcomes.
Abstract
Importance: Pediatric guidelines for the management of nonalcoholic fatty liver disease (NAFLD) recommend a healthy diet as treatment. Reduction of sugary foods and beverages is a plausible but unproven treatment. Objective: To determine the effects of a diet low in free sugars (those sugars added to foods and beverages and occurring naturally in fruit juices) in adolescent boys with NAFLD. Design, Setting, and Participants: An open-label, 8-week randomized clinical trial of adolescent boys aged 11 to 16 years with histologically diagnosed NAFLD and evidence of active disease (hepatic steatosis >10% and alanine aminotransferase level ≥45 U/L) randomized 1:1 to an intervention diet group or usual diet group at 2 US academic clinical research centers from August 2015 to July 2017; final date of follow-up was September 2017. Interventions: The intervention diet consisted of individualized menu planning and provision of study meals for the entire household to restrict free sugar intake to less than 3% of daily calories for 8 weeks. Twice-weekly telephone calls assessed diet adherence. Usual diet participants consumed their regular diet. Main Outcomes and Measures: The primary outcome was change in hepatic steatosis estimated by magnetic resonance imaging proton density fat fraction measurement between baseline and 8 weeks. The minimal clinically important difference was assumed to be 4%. There were 12 secondary outcomes, including change in alanine aminotransferase level and diet adherence. Results: Forty adolescent boys were randomly assigned to either the intervention diet group or the usual diet group (20 per group; mean [SD] age, 13.0 [1.9] years; most were Hispanic [95%]) and all completed the trial. The mean decrease in hepatic steatosis from baseline to week 8 was significantly greater for the intervention diet group (25% to 17%) vs the usual diet group (21% to 20%) and the adjusted week 8 mean difference was -6.23% (95% CI, -9.45% to -3.02%; P < .001). Of the 12 prespecified secondary outcomes, 7 were null and 5 were statistically significant including alanine aminotransferase level and diet adherence. The geometric mean decrease in alanine aminotransferase level from baseline to 8 weeks was significantly greater for the intervention diet group (103 U/L to 61 U/L) vs the usual diet group (82 U/L to 75 U/L) and the adjusted ratio of the geometric means at week 8 was 0.65 U/L (95% CI, 0.53 to 0.81 U/L; P < .001). Adherence to the diet was high in the intervention diet group (18 of 20 reported intake of <3% of calories from free sugar during the intervention). There were no adverse events related to participation in the study. Conclusions and Relevance: In this study of adolescent boys with NAFLD, 8 weeks of provision of a diet low in free sugar content compared with usual diet resulted in significant improvement in hepatic steatosis. However, these findings should be considered preliminary and further research is required to assess long-term and clinical outcomes. Trial Registration: ClinicalTrials.gov Identifier: NCT02513121.
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The effects of dietary supplementation with inulin and inulin-propionate ester on hepatic steatosis in adults with non-alcoholic fatty liver disease.
Chambers, ES, Byrne, CS, Rugyendo, A, Morrison, DJ, Preston, T, Tedford, C, Bell, JD, Thomas, L, Akbar, AN, Riddell, NE, et al
Diabetes, obesity & metabolism. 2019;21(2):372-376
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Non-alcoholic fatty liver disease (NAFLD) is characterised by an accumulation of fat within the liver, and is strongly associated with obesity. Recent investigations suggest that diet, the gut microbiota and liver fat storage could be linked through a mechanism involving short chain fatty acids (SCFA), in particular the SCFA propionate, which are produced by the gut bacteria. The aim of this randomised controlled study was to evaluate whether an inulin-propionate ester (IPE) has benefits in patients with NAFLD. Subjects with NAFLD received either 20 g/d of inulin (control) or IPE for 42 days. 18 subjects completed the trial. Intrahepatocellular lipids IHCL (a marker of fat accumulation in the liver) increased post supplementation in both groups with no significant difference between control and IPE group. There was a change in insulin resistance (HOMA-IR) which was significantly different between groups, with a non-significant increase in the inulin-control group and decrease in the IPE group. There were no within- or between-group differences in body composition. The authors discuss these unexpected results and suggest that the SCFA acetate, from inulin fermentation by gut bacteria, may have led to an increase in IHCL which was attenuated by the propionate.
Abstract
The short chain fatty acid (SCFA) propionate, produced through fermentation of dietary fibre by the gut microbiota, has been shown to alter hepatic metabolic processes that reduce lipid storage. We aimed to investigate the impact of raising colonic propionate production on hepatic steatosis in adults with non-alcoholic fatty liver disease (NAFLD). Eighteen adults were randomized to receive 20 g/d of an inulin-propionate ester (IPE), designed to deliver propionate to the colon, or an inulin control for 42 days in a parallel design. The change in intrahepatocellular lipid (IHCL) following the supplementation period was not different between the groups (P = 0.082), however, IHCL significantly increased within the inulin-control group (20.9% ± 2.9% to 26.8% ± 3.9%; P = 0.012; n = 9), which was not observed within the IPE group (22.6% ± 6.9% to 23.5% ± 6.8%; P = 0.635; n = 9). The predominant SCFA from colonic fermentation of inulin is acetate, which, in a background of NAFLD and a hepatic metabolic profile that promotes fat accretion, may provide surplus lipogenic substrate to the liver. The increased colonic delivery of propionate from IPE appears to attenuate this acetate-mediated increase in IHCL.
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The Effects of Extra Virgin Olive Oil on Alanine Aminotransferase, Aspartate Aminotransferase, and Ultrasonographic Indices of Hepatic Steatosis in Nonalcoholic Fatty Liver Disease Patients Undergoing Low Calorie Diet.
Shidfar, F, Bahrololumi, SS, Doaei, S, Mohammadzadeh, A, Gholamalizadeh, M, Mohammadimanesh, A
Canadian journal of gastroenterology & hepatology. 2018;2018:1053710
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Non-alcoholic fatty liver disease (NAFLD) is a risk factor for cardiovascular disease (CVD), which is the most common cause of death. The traditional Mediterranean diet has been shown to reduce the risk of NAFLD and CVD and this protective effect is thought to be in part due to the use of olive oil in this dietary pattern. The aim of this randomised, single-blind study was to evaluate the effect of virgin olive oil as part of a low-calorie diet on markers of NAFLD. 43 overweight or obese patients with NAFLD, characterised by increased liver enzymes (ALT and AST), were randomised to either a low calorie diet with normal fat or a low calorie diet with 20% of total energy intake from olive oil (overall percentage of fat 30% of total energy intake in both groups) for three months. Significant weight loss was observed in both groups, with no significant difference between groups. There was a reduction in liver enzymes in the olive oil group which was significantly greater than in the control group. The severity of liver steatosis (the accumulation of fat in the liver) did not change significantly in either group. The authors concluded that a low calorie diet with virgin olive oil led to slight weight loss and improvements in markers for NAFLD.
Abstract
Background: Coronary artery disease is the most common cause of death in the patients with nonalcoholic fatty liver disease (NAFLD). Studies have shown that there is a strong relation between the increase in the aminotransferase levels and fat accumulation in the liver with cardiovascular complications, independent of all aspects of the metabolic syndrome. This study aimed to examine the effect of virgin olive oil on alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and the severity of steatosis in the NAFLD patients undergoing a weight-loss diet. Methods: This clinical trial was carried out on 50 patients with nonalcoholic fatty liver (mean age of 45.91 ± 9.61 years, mean BMI of 29.7 ± 0.58 Kg/m2) and the subjects were randomly assigned to the olive oil group (receiving the equivalent of 20% of their total daily energy requirement from olive oil) or the control group (with normal consumption of oil) for 12 weeks. All the patients received a hypocaloric diet during the study. At the beginning and the end of the study, the serum levels of ALT and AST and liver steatosis were measured. Findings: A significant decrease in the level of ALT enzymes was observed in the control group at the end of the study (P = 0.004). In the olive oil group, both enzymes decreased compared to baseline measurements (P < 0.01). There were significant differences in the ALT and AST levels between the two groups (P < 0.02). The severity of liver steatosis did not change significantly during the study. Conclusion: The consumption of a low calorie diet enriched with olive oil, along with slight weight reduction, reinforces the desired effects of weight loss in improving the levels of the hepatic enzymes.
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A Khorasan Wheat-Based Replacement Diet Improves Risk Profile of Patients With Nonalcoholic Fatty Liver Disease (NAFLD): A Randomized Clinical Trial.
Dinu, M, Whittaker, A, Pagliai, G, Giangrandi, I, Colombini, B, Gori, AM, Fiorillo, C, Becatti, M, Casini, A, Benedettelli, S, et al
Journal of the American College of Nutrition. 2018;37(6):508-514
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Non-alcoholic fatty liver disease (NAFLD) is prevalent, however early intervention with lifestyle modifications such as weight loss, dietary therapy and physical activity may reverse it. Previous studies have shown that the Mediterranean diet, which includes a large proportion of grains, may reduce NAFLD. However no prior studies have assessed grains in isolation on these individuals. This randomised double blind parallel arm study aimed to assess the effects of a replacement diet with ancient khorasan wheat products on patients with NAFLD. 40 people with mild- moderate NAFLD were assigned to either khorasan wheat diet or a modern wheat grain diet for three months. This comparatively small study found that a khorasan wheat based diet improved liver function and inflammation. However regardless of the diet, measures of oxidative stress, which assesses the imbalance of free radicals and antioxidants in the body, was significantly reduced and some individuals were shown to regress from moderate to mild NAFLD. Nutrition practitioners who have clients with mild-moderate NAFLD may recommend a khorasan wheat based diet in the short term to improve biochemical and inflammatory markers and to potentially reverse disease development.
Abstract
OBJECTIVE KAMUT khorasan is an ancient grain with widely acclaimed health benefits. The aim of this study was to investigate the effects of a replacement diet with ancient khorasan wheat products in patients with NAFLD, in comparison to a similar replacement diet with control products made from organic semi-whole-grain modern wheat. METHODS Forty NAFLD patients (12 M/28 F; age 55.2 ± 10.4 years) with mild to moderate liver steatosis were included. The experimental design was a randomized, double-blind, parallel-arm study with 20 participants assigned to consume either KAMUT khorasan or control wheat products (pasta, bread, crackers, biscuits) over a 3-month period. Anthropometric measurements, blood analyses, and ultrasonography examination were performed at both the beginning and end of each dietary intervention. RESULTS After the implementation of a general linear model for repeated measurements adjusted for baseline demographic details, risk factors, and medication, alanine aminotransferase (ALT) was significantly reduced by 12%, aspartate aminotransferase (AST) by 14%, alkaline phosphatase (ALP) by 8%, and cholesterol by 6% only in the khorasan group (p < 0.05 for all). Similarly, significant reductions in circulating proinflammatory tumor necrosis factor-alpha by 50%, interleukin l-receptor antagonist-alpha by 37%, interleukin-8 by 24%, and interferon gamma by 24% were evident only in participants who consumed the khorasan products (p < 0.05 for all). Finally, significant improvements in the liver steatosis grading, Doppler perfusion index values, and reactive oxygen species (ROS) production were evident after consumption of both the khorasan and control products. CONCLUSIONS This study suggests that a short-term replacement diet with ancient KAMUT khorasan products is most effective in reducing metabolic risk factors and ameliorating the liver profile in patients with NAFLD.
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Intake of red wine in different meals modulates oxidized LDL level, oxidative and inflammatory gene expression in healthy people: a randomized crossover trial.
Di Renzo, L, Carraro, A, Valente, R, Iacopino, L, Colica, C, De Lorenzo, A
Oxidative medicine and cellular longevity. 2014;2014:681318
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The traditional Mediterranean diet is known to reduce the risk of developing several chronic diseases including cardiovascular disease (CVD). The major underlying factors of CVD are oxidative stress and chronic inflammation, and oxidised low-density lipoprotein (ox-LDL) particles have been associated with increased CVD risk. The aim of this crossover trial was to evaluate the impact of various meal combinations on ox-LDL status and genetic expression of oxidative stress and inflammation. A total of 24 participants were analysed after consumption of four different meal combinations with washout periods in between: Mediterranean meal, McDonald’s meal, both with and without red wine. The findings of this study showed a significant reduction of ox-LDL depending on the quality of meal consumed, and found red wine to have a protective effect. The results of this study indicate that the antioxidant potential of nutrients found in the Mediterranean diet and red wine may be important for reducing inflammation and oxidative stress in chronic disease.
Abstract
Several studies have found that adherence to the Mediterranean Diet, including consumption of red wine, is associated with beneficial effects on oxidative and inflammatory conditions. We evaluate the outcome of consumption of a McDonald's Meal (McD) and a Mediterranean Meal (MM), with and without the additive effect of red wine, in order to ascertain whether the addition of the latter has a positive impact on oxidized (ox-) LDL and on expression of oxidative and inflammatory genes. A total of 24 subjects were analyzed for ox-LDL, CAT, GPX1, SOD2, SIRT2, and CCL5 gene expression levels, before and after consumption of the 4 different meal combinations with washout intervals between each meal. When red wine is associated with McD or MM, values of ox-LDL are lowered (P < 0.05) and expression of antioxidant genes is increased, while CCL5 expression is decreased (P < 0.05). SIRT2 expression after MM and fasting with red wine is significantly correlated with downregulation of CCL5 and upregulation of CAT (P < 0.001). GPX1 increased significantly in the comparison between baseline and all conditions with red wine. We highlighted for the first time the positive effect of red wine intake combined with different but widely consumed meal types on ox-LDL and gene expression. Trial Registration. This trial is registered with ClinicalTrials.gov NCT01890070.