Calorie Restriction Group Research Articles

The distinct mechanism regulating taurine homeostasis in mice: Nutrient availability affects taurine levels in the liver and energy restriction influences it in the intestine

AimsOur previous findings indicate that caloric restriction (CR) stimulates the production and secretion of taurine-conjugated bile acids in mice. Subsequent processing by gut microbiota leads to increased levels of deconjugated bile acids, taurine, and various taurine conjugates in the intestine. Furthermore, we demonstrated that carbohydrate restriction and protein restriction, to a smaller extent, mirror the impact of CR in terms of hepatic production of bile acids but not their secretion. We hypothesized that modulating dietary macronutrient levels would influence taurine homeostasis in the liver and intestine of ad libitum-fed and CR animals. Materials and methodsAd libitum-fed male mice were allocated to receive either a control, low-protein (LP), low-fat (LF), or low-carbohydrate (LC) diet. Meanwhile, CR groups were given 80 % of their regular voluntary food intake as a control, high-protein (HP), high-fat (HF), or high-carbohydrate (HC) diet. Key findingsWhile CR did not affect the taurine levels and its conjugates in the liver, alteration in carbohydrates and protein intake impacted it. Conversely, in the intestine, CR increased the amount of free and conjugated taurine, whereas the various diets did not affect it or disrupt the CR-specific phenotype. Notably, variations in diet composition impacted the expression of the taurine transporter (Slc6a6) and glutathione-S transferases (GST) in the intestine as well as cysteine dioxygenase (Cdo) in the liver. SignificanceThe liver and the intestine show distinct responses to dietary interventions, with hepatic taurine being affected by the diet composition, while intestinal taurine is governed by energy availability.

Time-Restricted Eating Versus Daily Calorie Restriction: Effect on Sleep in Adults with Obesity over 12 Months.

Objective: The aim of this secondary analysis was to compare the effects of time-restricted eating (TRE) versus daily calorie restriction (CR) on sleep quality, duration, insomnia severity, and risk of obstructive sleep apnea in adults with obesity over one year. Methods: A total of 90 participants were randomized to one of three groups for 12 months: 8 h TRE (eating only between 12 p.m. and 8 p.m.); CR (25% daily calorie restriction) or a no-intervention control group. Results: By the end of the study, weight loss was 4.61 kg (95% CI; 7.37 to 1.85 kg; p ≤ 0.01) for the TRE group and 5.42 kg (CI; 9.13 to 1.71 kg; p ≤ 0.01) for the CR group, with no statistically significant difference between TRE and CR (0.81 kg [CI; 3.07 to 4.69]; p = 0.68]). Self-reported sleep quality, sleep duration, insomnia severity, and risk of obstructive sleep apnea did not change in the TRE or CR groups versus controls by month 12. Conclusions: These findings suggest that the weight loss produced by TRE and CR does not have any impact on various sleep parameters in adults with obesity over one year.

Effects of calorie-restricted diet on health state and intestinal flora in Hashimoto's thyroiditis patients: Study protocol for a randomized controlled trial.

Hashimoto's thyroiditis (HT) is an autoimmune disease, characterized by abnormal elevation in thyroid peroxidase antibody and/or thyroglobulin antibody. In recent decades, HT disease has become more and more widespread. Patients always report multiple symptoms, even though their thyroid hormone levels are kept in normal ranges. However, no treatment exists to effectively reduce the levels of thyroid antibodies. Our study aims to determine whether calorie-restricted diet is helpful in improving health of HT patients. This is a 3-month randomized controlled trial. HT patients will be randomized into a calorie-restricted (CR) group or a calorie-unrestricted control group. All the participants will be instructed to consume a diet that includes a combination of 45-55% calories from carbohydrates, 20-30% from fats, and 15-25% from proteins, according to current Chinese Dietary Guidelines. Participants in CR group need to limit their calories intake equal to their basal energy expenditure, which means that their daily caloric intake will be limited by about 20-30%. The study population is planned to be 66 HT patients aged 18 to 65 years. The primary outcome is change of thyroid antibody levels from baseline. Secondary outcomes include the changes of non-hypothyroid symptoms scores, thyroid function indexes, morphology of thyroid, T lymphocyte subpopulations, inflammatory biomarkers and lipids from baseline to 12 weeks. This trial will have implications for nutrition treatment policy in regard to thyroid antibodies control, immune dysfunction and related non-hypothyroid symptoms improvement among HT patients.

The Effects of Short-Term Electromyostimulation Exercises and Different Diet Types on Body Composition in Obese Women

Obesity is one of the world's most risky health problems with increasing prevalence. This study aimed to investigate the effect of calorie-restricted diet and intermittent fasting diet on body composition with electromyostimulation (EMS) applications in obese females. The study was conducted with 90 obese females. Participants were randomly divided into 5 groups, EMS, EMS+intermittent fasting (EMS+IF), EMS+calorie restricted (EMS+CR), intermittent fasting (IF), and calorie restricted (CR) diet groups. EMS groups received 27min/2g/week EMS exercise protocol for 4 weeks. Furthermore, dietary interventions were conducted with all groups (except EMS). Body composition measurements of the participants were obtained with a bioelectrical impedance device. Two-way repeated measures ANOVA was used to analyze the obtained data. BMI, body mass, and body fat weight decreased significantly in the EMS+IF, and EMS+CR groups compared to the EMS group while skeletal muscle weight decreased dramatically in all four groups compared to the EMS group. In body analysis regional (right-left arm, right-left leg, and trunk) parameters, fat weight decreased significantly in EMS+IF, and EMS+CR groups compared to the other groups. Moreover, muscle mass decreased more in the EMS+CR and EMS+IF groups compared to the other groups. Dietary interventions in the form of CR or IF with EMS significantly affected body composition measurements in obese participants. EMS and IF dietary interventions may be therapeutic tools to combat obesity.Keywords:Calorie-Restricted Diet, Electromyostimulation, Exercise, Intermittent Fasting, Obesity

Intermittent fasting, calorie restriction, and a ketogenic diet improve mitochondrial function by reducing lipopolysaccharide signaling in monocytes during obesity: A randomized clinical trial

BackgroundMitochondrial dysfunction occurs in monocytes during obesity and contributes to a low-grade inflammatory state; therefore, maintaining good mitochondrial conditions is a key aspect of maintaining health. Dietary interventions are primary strategies for treating obesity, but little is known about their impact on monocyte bioenergetics. Thus, the aim of this study was to evaluate the effects of calorie restriction (CR), intermittent fasting (IF), a ketogenic diet (KD), and an ad libitum habitual diet (AL) on mitochondrial function in monocytes and its modulation by the gut microbiota. Methods and findingsA randomized controlled clinical trial was conducted in which individuals with obesity were assigned to one of the 4 groups for 1 month. Subsequently, the subjects received rifaximin and continued with the assigned diet for another month. The oxygen consumption rate (OCR) was evaluated in isolated monocytes, as was the gut microbiota composition in feces and anthropometric and biochemical parameters. Forty-four subjects completed the study, and those who underwent CR, IF and KD interventions had an increase in the maximal respiration OCR (p=0.025, n2p = 0.159 [0.05, 0.27] 95% confidence interval) in monocytes compared to that in the AL group. The improvement in mitochondrial function was associated with a decrease in monocyte dependence on glycolysis after the IF and KD interventions. Together, diet and rifaximin increased the gut microbiota diversity in the IF and KD groups (p=0.0001), enriched the abundance of Phascolarctobacterium faecium (p=0.019) in the CR group and Ruminococcus bromii (p=0.020) in the CR and KD groups, and reduced the abundance of lipopolysaccharide (LPS)-producing bacteria after CR, IF and KD interventions compared to the AL group at the end of the study according to ANCOVA with covariate adjustment. Spearman’s correlation between the variables measured highlighted LPS as a potential modulator of the observed effects. In line with this findings, serum LPS and intracellular signaling in monocytes decreased with the three interventions (CR, p=0.002; IF, p=0.001; and KD, p=0.001) compared to those in the AL group at the end of the study. ConclusionsWe conclude that these dietary interventions positively regulate mitochondrial bioenergetic health and improve the metabolic profile of monocytes in individuals with obesity via modulation of the gut microbiota. Moreover, the evaluation of mitochondrial function in monocytes could be used as an indicator of metabolic and inflammatory status, with potential applications in future clinical trials. Trial registrationThis trial was registered with ClinicalTrials.gov (NCT05200468)

Long-term intermittent caloric restriction remodels the gut microbiota in mice genetically prone to breast cancer

ObjectivesGut microbiota dysbiosis is among the risk factors for breast cancer development, together with genetic background and dietary habits. However, caloric restriction has been shown to remodel the gut microbiota and slow tumor growth. Here, we investigated whether the gut microbiota mediates the preventive effects of long-term chronic or intermittent caloric restriction on breast cancer predisposition. Methods10-week-old transgenic breast cancer-prone mice were randomly assigned to dietary groups (ad libitum, chronic caloric restriction, and intermittent caloric restriction groups) and fed up to week 81. Stool samples were collected at weeks 10 (baseline), 17 (young), 49 (adult), and 81 (old). 16S rRNA gene sequencing was performed to identify the gut microbiota profile of the different groups. In order to investigate the breast cancer gut microbiota profile within genetically predisposed individuals regardless of diet, mammary tumor-bearing mice and mammary tumor-free but genetically prone mice were selected from the ad libitum group (n = 6). ResultsIntermittent caloric restriction increased the microbial diversity of adult mice and modified age-related compositional changes. A total of 13 genera were differentially abundant over time. Pathogenic Mycoplasma was enriched in the re-feeding period of the old intermittent caloric restriction group compared with baseline. Furthermore, mammary tumor-free mice showed shared gut microbiota characteristics with mammary tumor-bearing mice, suggesting an early link between genetic predisposition, gut microbiota, and breast cancer development. ConclusionsOur study revealed the role of gut microbes in the preventive effects of caloric restriction against breast cancer development, implying the significance of diet and microbiome interplay.

Effect of time restricted eating versus daily calorie restriction on sex hormones in males and females with obesity.

This study examined the effects of time restricted eating (TRE) on sex hormones in males and females, versus daily calorie restriction (CR). Adults with obesity (n = 90) were randomized to 1 of 3 groups for 12-months: 8-h TRE (eating only between 12:00 to 8:00 pm, with no calorie counting); CR (25% energy restriction daily); or control. Body weight decreased (P < 0.01) in the TRE and CR groups, relative to controls, in males, premenopausal females, and postmenopausal females, by month 12. Total testosterone, dehydroepiandrosterone (DHEA), and sex hormone binding globulin (SHBG) levels did not change over time, or between groups, in males, premenopausal females, and postmenopausal females. Estradiol, estrone, and progesterone were only measured in postmenopausal females, and remained unchanged. These findings suggest that TRE produces significant weight loss but does not impact circulating sex hormone levels in males and females with obesity over 12 months, relative to CR and controls.

The Comparison of Long-term Effect Between Intermittent Fasting and Calorie Restriction on Neurological Parameters of Mice

Intermittent fasting (IF) and calorie restriction (CR) were purported to have health benefits. This research aimed to determine the long-term effect of IF and CR on selected neurological parameters in mice. Swiss Webster male mice were divided into 3 groups: ad libitum feeding (AL), IF, and CR. Mice in each group received the treatment for 16 weeks. They were then tested for anhedonia, depression, aggressiveness, and social approach. They were also subjected to contextual fear conditioning tests to model PTSD. Compared to AL, sucrose intake in the IF group was lower, while the CR group showed higher intake (p&lt;0.01). This anhedonia characteristic shown in the IF group was confirmed not related to depression, as shown by significantly lower immobility time in the forced swimming test compared to AL (p&lt;0.05). In the resident-intruder test, attack numbers in the IF group were fewer than in the AL group (p&lt;0.05). As demonstrated by the results of the three-chamber test, the reduced aggressiveness in IF mice was unrelated to a deficit in sociability. In the fear extinction test (PTSD model), mice in the IF group showed lower freezing compared to those in AL (p&lt;0.001). Although both IF and CR caused a reduction in total food intake, in the mice model tested, IF was shown to have favorable impacts on neurological parameters.

A 2-Year Calorie Restriction Intervention Improves Diet Quality Without Compromising Nutritional Adequacy: The CALERIE Trial

Background: The Comprehensive Assessment of Long-Term Effects of Reducing Intake of Energy (CALERIE) was the first randomized controlled trial of calorie restriction (CR) on biomarkers of aging and cardiometabolic health in humans without obesity. Objective: To determine diet quality and nutritional adequacy during a 2y calorie restriction intervention among healthy adults without obesity. Design: CALERIE phase 2 was a multi-site, randomized controlled trial of 2y of CR vs. ad libitum (AL) control. CR participants received extensive dietary education and support. Food diaries were completed at baseline and months 6, 12, 18, and 24 and analyzed using NDSR. Diet quality was evaluated using the PANDiet diet quality index. Nutritional adequacy was defined using sex- and age-specific Estimated Average Requirement (EAR) or Adequate Intake (AI) criteria for each nutrient. Results: 220 participants completed baseline assessments and were randomized (145 CR, 75 AL; 70% women, age 38±7 y, BMI 25.1±1.7 kg/m2); 86% completed the 2y study. The level of calorie restriction achieved averaged 11.9±0.7% during the 2y intervention. Diet quality improved in the CR group (BL 74.3±5.1%; CR average 76.3±5.3%, p &lt; 0.0001), but not in the AL group ( p &lt; 0.0002 between groups). Nutritional adequacy improved modestly in CR, but not in AL. More than 90% of CR participants achieved 100% of EAR or AI during CR for protein, carbohydrate, 6 of 12 vitamins (A, B1, B2, B3, B6, B12), and 5 of 9 minerals (copper, iron, phosphorus, selenium, sodium). Nutrients for which &lt;90% of participants achieved adequacy included fiber, omega-3 fatty acids, vitamins B5, B9, C, E, and K, and the minerals calcium, magnesium, potassium, and zinc. Conclusion: A 2y CR intervention designed to promote healthy aging and comprised of comprehensive nutrition counseling promoted improvements in diet quality and maintenance or improvements in nutritional adequacy. This research was supported by grants U01AG020478, U01AG020480, U01AG020487, U01AG022132, U24AG047121, R33AG070455, and R01AG071717 from the National Institute on Aging. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Caloric Restriction Improves Hepatic Thyroid Hormone Signaling During Metabolic Syndrome

Thyroid hormone dysregulation has been associated with metabolic syndrome (MetS) risk factors: hypertension, atherogenic dyslipidemia, obesity, and glucose intolerance. Several pathways are regulated by thyroid hormones such as the insulin signaling pathway, lipid metabolism, and antioxidant production among others. Impairment of thyroid hormone production causes dysregulation of these pathways. Caloric restriction (CR) is a form of non-pharmaceutical approach that has been shown to ameliorate MetS cluster factor conditions. However, caloric restriction's effects on thyroid hormone signaling during MetS remains unclear. A cohort of 11-week-old Otsuka Long Evan Tokushima Fatty (OLETF) and lean-strain control Long Tokushima Evans Otsuka (LETO) rats were fed chow ad libitium for 4 weeks. At 15 weeks, the animals were fed a 50% CR diet (compared to their control) for 10 days and assigned to four groups: (1) LETO (n=14), (2) LETO CR (n=14), (3) OLETF (n=14), and (4) OLETF CR (n=14). After the CR period, 7 animals from each group were then refed at pre-CR levels for 7 days and assigned to four groups: (1) LETO (n=7), (2) LETO post-recovery (LETO PR; n=7), (3) OLETF (n=7), and (4) OLETF PR (n=7). Mean body mass decreased 12% and 14% in LETO and OLETF, respectively, during the CR period compared to their ad lib controls. Hepatic deiodinase 1 (Dio1) protein expression was reduced by 41% in the OLETF compared to LETO. Dio1 protein expression was increased by 150% during CR and 88% by PR in OLETF. Deiodinase 2 (Dio2) showed a decreasing trend in OLETF rats compared to LETO and an increasing trend in the OLETF CR group compared to its ad lib control. Both free (fT4) and total T4 (tT4) had increasing trends in OLETF compared to LETO. CR induced a decreasing trend in fT4 and tT4 in OLETF compared to ad lib OLETF controls. These findings demonstrate that caloric restriction induces changes in hepatic thyroid hormone signaling that can improve impaired metabolism induced by MetS. Doctoral fellowship UC MEXUS-CONACYT 440553 National Institute on Minority Health and Health Disparities grant 9T37-MD001480 American Heart Association 23DIVSUP1066372. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

Increased Depressive-like, Anxiety-like, and Perseverative-like Behavior in Binge Eating Model in Juvenile Rats.

The aim of the present study was to evaluate depressive-like, anxiety-like, and perseverative-like behaviors in a binge eating model. Juvenile Wistar rats, using the binge eating model, were compared to caloric restriction, induced stress, and control groups. Rats of the induced stress group presented binge-like behaviors in standard food intake in the second cycle of the experiment when compared to the caloric restriction group and the binge eating model group. Depressive-like behavior was observed in the binge eating model group with longer immobility time (p < 0.001) and less swim time (p < 0.001) in comparison to the control group. Anxiety-like behavior was observed by shorter duration of burying latency in the binge eating model group when compared to the induced stress group (p = 0.04) and a longer duration of burying time when compared to the control group (p = 0.02). We observed perseverative-like behavior by the binge model group, who made more entries to the new arm (p = 0.0004) and spent a longer time in the new arm when compared to the control group (p = 0.0001). Our results show differences in behaviors between the groups of rats studied. These results suggest that calorie restriction-refeeding, along with stress, may lead to depressive-like, anxiety-like, and perseverative-like behavioral changes in male Wistar rats.

Effect of long-term caloric restriction on telomere length in healthy adults: CALERIE™ 2 trial analysis.

Caloric restriction (CR) modifies lifespan and aging biology in animal models. The Comprehensive Assessment of Long-Term Effects of Reducing Intake of Energy (CALERIE™) 2 trial tested translation of these findings to humans. CALERIE™ randomized healthy, nonobese men and premenopausal women (age 21-50y; BMI 22.0-27.9 kg/m2), to 25% CR or ad-libitum (AL) control (2:1) for 2 years. Prior analyses of CALERIE™ participants' blood chemistries, immunology, and epigenetic data suggest the 2-year CR intervention slowed biological aging. Here, we extend these analyses to test effects of CR on telomere length (TL) attrition. TL was quantified in blood samples collected at baseline, 12-, and 24-months by quantitative PCR (absolute TL; aTL) and a published DNA-methylation algorithm (DNAmTL). Intent-to-treat analysis found no significant differences in TL attrition across the first year, although there were trends toward increased attrition in the CR group for both aTL and DNAmTL measurements. When accounting for adherence heterogeneity with an Effect-of-Treatment-on-the-Treated analysis, greater CR dose was associated with increased DNAmTL attrition during the baseline to 12-month weight-loss period. By contrast, both CR group status and increased CR were associated with reduced aTL attrition over the month 12 to month 24 weight maintenance period. No differences were observed when considering TL change across the study duration from baseline to 24-months, leaving it unclear whether CR-related effects reflect long-term detriments to telomere fidelity, a hormesis-like adaptation to decreased energy availability, or measurement error and insufficient statistical power. Unraveling these trends will be a focus of future CALERIE™ analyses and trials.

Caloric restriction reduces proteinuria in male rats with established nephropathy.

Reducing proteinuria is a crucial approach in preventing kidney function loss. Previous preclinical studies indicated that caloric restriction (CR) imposed at a young age protects against age-related proteinuria. However, these studies have not explored CR in established renal disease. Therefore, this study aimed to investigate the impact of CR on established proteinuria. Rats, aged 12 ± 2 weeks, were administered 2.1 mg/kg of Adriamycin. Six weeks after injection, protein excretion was measured, and a [13 N]ammonia positron emission tomography (PET) scan was conducted to assess kidney perfusion. After 7 weeks rats were divided into four groups: adlibitum (AL) and CR groups fed either a 12% or a 20% protein diet. All groups were treated for 12 weeks. Blood pressure was measured and a second PET scan was acquired at the end of the study. The animals subjected to CR exhibited a 20.3% decrease in protein excretion (p = 0.003) compared to those in the AL groups. Additionally, blood pressure in the CR group was 21.2% lower (p < 0.001) than in the AL groups. While kidney function declined over time in all groups, the 20% CR group demonstrated the smallest decline. Thus CR effectively reduces urinary protein excretion and lowers blood pressure in rats with established proteinuria.

Modulation of intestinal metabolites by calorie restriction and its association with gut microbiota in a xenograft model of colorectal cancer

BackgroundColorectal cancer (CRC) is a common malignant tumor, and its occurrence and development are closely related to dysbiosis of gut microbes. Previously, we found calorie restriction altered the composition of the microbial community in a colorectal cancer mouse model and inhibited in vivo growth of CRC cells. Here, we aim to further investigate alteration in the intestinal metabolites and explore the interplay between gut microbiota and intestinal metabolites upon calorie restriction.MethodsHuman colorectal cancer HCT116 cells were used to establish a colorectal cancer xenograft mouse model. The changes of intestinal metabolites in the ad libitum group and calorie restriction group were investigated through untargeted metabolomics analysis. The integrative analysis of gut microbiota and metabolites to elucidate the associations between gut microbiota and intestinal metabolites.ResultsCompared with the mice in the ad libitum group, mice upon calorie restriction exhibited downregulation of Isoleucyl-Valine, and upregulation of D-Proline, 1-Palmitoylphosphatidylcholine, and 4-Trimethylammoniobutanoic acid. Additionally, an integrative analysis of gut microbiota and metabolites revealed that Lactobacillus, Parabacteroides and rC4-4 genus were upregulated in the calorie restriction group and positively correlated with D-Proline, 4-Trimethylammoniobutanoic acid or 1-Palmitoylphosphatidylcholine, while negatively correlated with Isoleucyl-Valine. In contrast, the Nitrospirae and Deferribacteres phylum exhibited opposite trends.ConclusionCalorie restriction affects the abundance of gut microbes such as Nitrospirae phylum and Lactobacillus genus in mouse model of colorectal cancer, leading to changes in the metabolites such as D-Proline、Isoleucyl-Valine, which contributes to the suppression of in vivo growth of CRC by calorie restriction.

Intermittent fasting associated with coconut oil (Cocos nucifera L.) alters gut-liver axis parameters in diet-induced obese rats

ObjectiveThe aim of this article is to investigate the effect of intermittent fasting, associated or not with coconut oil intake, on the gut-liver axis of obese rats. MethodsA total of 50 rats were divided into five groups: control, obese, obese with intermittent fasting, obese with intermittent fasting plus coconut oil, and obese with caloric restriction. The rats were induced to obesity with a high-sugar diet for 17 wk. The respective interventions were carried out in the last 4 wk. ResultsThe groups with intermittent fasting protocols had reduced total cholesterol (on average 54.31%), low-density lipoprotein (on average 53.39%), and triacylglycerols (on average 23.94%) versus the obese group; and the obese with intermittent fasting plus coconut oil group had the highest high-density lipoprotein compared with all groups. The obese with intermittent fasting plus coconut oil and obese with caloric restriction groups had lower metabolic load compared with the other groups. The obese group had high citric and succinic acid concentrations, which affected the hepatic tricarboxylic acid cycle, while all the interventions had reduced concentrations of these acids. No histologic changes were observed in the intestine or liver of the groups. ConclusionIntermittent fasting, especially when associated with coconut oil, had effects comparable with caloric restriction in modulating the parameters of the gut-liver axis.

The Effect of high-intensity interval training with caloric restriction on gene expression of apoptosis indices HSP70 and HSP60 in the myocardium of male rats

Background and aims: The purpose of this study was to investigate the effect of high-intensity interval training combined with calorie restriction on the expression of HSP70 and HSP60 in the myocardium of male rats. Methods: A total of 27 male rats were randomly divided into three groups (9 rats in each group): control, caloric restriction, and caloric restriction with high-intensity interval training. During the study, the control group had free access to water and food, but the amount of food in the food restriction group was limited to 50% and the calorie restriction-exercise group was limited to 25% of the control group. The restriction-exercise group was subjected to intense interval training for eight weeks. The gene expression of apoptotic indicators HSP70 and HSP60 was assessed using the real-time PCR method. The data were analyzed using Shapiro-Wilk test and ANOVA test. Results: Body weight in both calorie restriction groups significantly decreased (P=0.001). The results of the post hoc test showed a significant increase in the expression of HSP70 and HSP60 genes in the myocardium of male rats in the calorie-restricted-exercise group compared to the calorie-restricted and control groups (P=0.001). Additionally, no significant difference was observed between the two restriction and control groups in terms of HSP70 and HSP60 (P=0.102). Conclusion: The combination of high-intensity interval training and mild food restriction significantly increased HSP60 and HSP70 expression.

Calorie restriction improves serum lipid metabolism, colon metabolites and microbiota in pigs

Abstract Calorie restriction plays a role in reducing food intake and weight gain, and improving health and lifespan. We hypothesized that calorie restriction would affect body weight (BW), serum indices, gut microbiota, metabolites and short-chain fatty acids of finishing pigs. Castrated male (Landrace × Yorkshire) pigs (86.13 ± 3.50 kg) were randomly assigned into two groups indicated as control (Con) and calorie restriction (CR) (eight pigs/group), respectively. Pigs in the Con group consumed feed ad libitum, whereas pigs in the CR group were fed 70% of the amount of feed in the Con group. The trial lasted for 38 days. Blood and colonic contents were collected for serum parameters, and microbiota and metabolome analysis, respectively. Main effects were tested by Student’s t-test. We found that for finishing pigs, calorie restriction reduced the cumulative food intake, BW gain, serum total cholesterol, triglyceride, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, alanine aminotransferase and aspartate aminotransferase levels. Calorie restriction did not change the α and β diversity of intestinal microbiota. However, calorie restriction significantly increased the abundance of Romboutsia and unclassified_c_Bacilli, and significantly reduced the abundance of Lachnospiraceae_XPB1014_group, Candidatus_Saccharimonas, Escherichia-–Shigella and Gastranaerophilales. Calorie restriction also simultaneously changed the structure of intestinal metabolites and increased the concentration of isobutyric acid, isovaleric acid and valeric acid. In conclusion, calorie restriction may affect metabolism, reduce obesity and improve intestinal microbiota, which may be a healthy diet treatment that can reduce obesity and improve metabolism.

Post-restriction hyperphagia and metabolic responses to short-term calorie restriction in C57BL/6 mice

Aims: To evaluate post-restriction hyperphagia (PRH) responses to short-term calorie restriction (CR) and the potential drivers of this behaviour. Methods: Adult male C57BL/6J mice underwent 30% CR for 5 to 30 days, then refed for 12 days. Energy intake, body mass, fat mass, fat-free mass, body temperature, and physical activity were measured continuously throughout the CR and re-feeding phases and daily energy expenditure was measured over final 2 days of CR and the first 5 days of re-feeding. Results: Following restriction, energy intake, body mass, fat free mass, body temperature and daily energy expenditure were reduced in all groups compared to controls (P&lt;0.05). Only the 20d and 25d groups had significantly lower fat mass than controls (P=0.004). Total physical activity and dark-phase physical activity did not differ between control and CR groups (P=0.446 and 0.380 respectively); but light-phase physical activity of groups 20d, 25d and 30d increased significantly (P&lt;0.001) due to food anticipatory activity. All CR groups displayed peak PRH on day1 of refeeding. Total energy intake over the following 2-5 days of refeeding was also greater than the controls (P=0.002). The magnitude of PRH increased with CR duration and body mass loss at the individual level (P&lt;0.001). In a multiple regression analysis fat free mass loss was the main factor that was correlated with the level of PRH (Multiple regression R2=32.7%, fat mass P=0.036, fat free mass P=0.003). Conclusion: Hunger (reflected by PRH) was mostly related to body mass and fat free mass loss. The effect of fat free mass loss was the opposite of that expected if fat free mass is a key driver of food intake as recently postulated. Developing restriction protocols that minimize loss of fat free mass may reduce the level of hunger that emerges when individuals are under restriction.

Aerobic Exercise and Calorie Restriction Alter Mitochondrial Biogenesis and Dynamics in Male Wistar Rats with Nonalcoholic Fatty Liver Disease

Background: Non-alcoholic fatty liver disease (NAFLD) is one of the most common liver diseases. limited studies has been done on the effects of calorie restriction (CR) and aerobic exercise (AE) on mitochondrial biogenesis (PGC1α, NRF2) and dynamics (MFN2, DRP1) in NAFLD rats. In this present, the changes on PGC1α, NRF2, MFN2 and DRP1 Proteins expression after 12 weeks of CR and AE intervention in the NAFLD rat model were evaluated. Methods: 40 rats were used, with 32 of them being induced to develop NAFLD through an 8-week high-fat diet. These rats were then divided into five groups: control (ate fatty food), sham (ate normal food), CR, AE, and CA (CR &amp; AE). The CA and CR groups received 60% of their daily diet, while the AE and CA groups participated in treadmill aerobic exercise sessions five times a week for 12 weeks. After the intervention period, protein expression levels were measured in all groups. Data analysis utilized one-way ANOVA with a significance level set at P&lt;0.05. Results: As shown by the findings, there are significant differences in the expression of proteins between the groups. In PGC1α, NRF2, MFN2 proteins, CA group showed higher protein expression than CR group (respectively P=0.045, P=0.028, P=0.025). However, it presented a significant reduction in DRP1 protein. (P=0.015), and there was no significant difference between CA and AE in expression of PGC1α, NRf2, MFN2 and DRP1 proteins (P=0.995, P=0.44, P=0.635, P=0.076). Conclusion: The results showed that AE combined with CR is able to improve NAFLD.

Effectiveness of Time-Restricted Eating with Caloric Restriction vs. Caloric Restriction for Weight Loss and Health: Meta-Analysis

Time-restricted eating (TRE) is an increasingly popular dietary strategy for weight loss. Recent studies suggest that combining TRE with caloric restriction (CR) may have more favorable effects on both physical and biochemical aspects when compared with CR alone. Therefore, we performed a meta-analysis to compare the effects of TRE with CR vs. CR alone on anthropometric and biochemical measures in overweight or obese adults. We reviewed articles from PubMed, Web of science, EMBASE, and the Cochrane Library published before 25 May 2023. The meta-analysis incorporated data from seven randomized controlled trials of nine interventions, with a total of 231 participants in the TRE with CR group and 227 participants in the CR-only group. Data were analyzed using RewMan version 5.4.1. All results in our meta-analysis were described as mean difference (MD) with 95% confidence interval (Cl). Results showed that TRE with CR compared to CR alone resulted in significantly greater reductions in body weight (MD: −2.11 kg, 95% CI: −2.68 kg to −1.54 kg, p = &lt; 0.00001, I2 = 42%), body fat mass (MD: −0.75 kg, 95% CI: −1.35 kg to −0.16 kg, p = 0.01; I2 = 0%), and waist circumference (MD: −1.27 cm, 95% CI: −2.36 cm to −0.19 cm, p = 0.02, I2 = 0%), while no additional impact of TRE in combination with CR in comparison to CR on serum biochemical parameters were found. Our results suggest that the improvement in biochemical parameters are mainly caused by CR, while improvements in anthropometric parameters are further enhanced by TRE.