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Background Obesity and its associated health complications have become a global public health concern, necessitating innovative approaches to weight management. One emerging area of research focuses on the influence of chronotype, an individual’s preferred timing for daily activities, on eating habits, weight regulation, and metabolic health. Recent observational studies suggest that the misalignment between an individual’s chronotype and external cues, such as meal timing, may contribute to metabolic dysregulation and obesity, but evidence from intervention studies is still limited. This study protocol describes a randomized controlled trial designed to explore the effects of a chronotype-adapted diet, compared with a diet with a conventional calorie distribution, on weight loss, cardiometabolic health, and gut microbiota composition. Methods A total of 150 overweight/obese adults will be recruited for this 4-month parallel-group, randomized, two-arm, open-label, superiority trial with 1:1 allocation ratio. Participants will be randomly assigned to either the intervention group or the control group. The intervention group will receive a low-calorie chronotype-adapted diet with a calorie distribution adapted to the individual chronotype (morning or evening), optimizing meal timing according to their peak metabolic periods. The control group will follow a standardized low-calorie healthy eating plan without considering chronotype. Both diets will have equivalent daily calorie content, adjusted according to gender and starting weight. Anthropometric measurements, body composition, blood, and fecal samples will be obtained from each participant at the beginning and the end of the study. The primary outcome is weight change from baseline. Secondary outcomes are changes from baseline in body mass index (BMI), fat mass, lipid and glycemic profile, fecal microbiota profile, and short-chain fatty acids (SCFAs). Discussion The results of this randomized controlled trial have the potential to advance our understanding of the complex interactions between chronotype, diet, body weight, and health outcomes. By providing evidence for personalized dietary interventions based on individuals’ circadian preferences, this research could offer insights into personalized nutrition strategies. Such knowledge could guide the development of innovative dietary interventions to optimize the prevention and management of overweight and obesity, while also improving the risk profile of these individuals. Trial registration ClinicalTrials.gov NCT05941871. Registered on 18 May 2023.

Diet may influence early biological processes involved in colorectal carcinogenesis. Red and processed meat intake has been associated to increased colorectal cancer (CRC) risk, potentially through heme-driven oxidative and genotoxic mechanisms. This 12-week behavioral, free-living, randomized, open-label study evaluated how three different diets impact CRC risk markers: a meat-based diet (MBD: high risk), a meat-based diet with α-tocopherol supplementation (MBD-T: medium risk, hypothesized to attenuate heme-induced oxidative stress and lipid peroxidation), and a pesco-vegetarian diet (PVD: low risk). A total of 113 healthy adults (18–50 years) were randomized, and 103 completed the study. The primary outcome was fecal water (FW) genotoxicity at baseline and after 12 weeks; secondary outcomes included FW cytotoxicity, lipoperoxidation, fecal short-chain fatty acids (SCFAs) and bile acids, and blood biomarkers related to iron metabolism and inflammation, also measured pre- and post-intervention. Mixed-effects linear models (time × diet), adjusted for age, sex, and BMI, were applied. FW genotoxicity increased significantly after MBD (+ 15.97%DNA damage; 95% CI 4.61 to 27.32; p = 0.006), with no significant within-group changes in MBD-T or PVD. Between-diet differences in change indicated greater increases in fecal TBARS following MBD (p = 0.010) and MBD-T (p = 0.037) compared with PVD, and a significantly greater increase in 4-HNE after MBD compared with PVD (p = 0.019). The FW Viability Index decreased significantly after MBD (p = 0.021). Differences in change between diets were also significant for circulating ferritin and inflammatory markers, which increased more after MBD compared with PVD (ferritin, IL-6, TNF-α), whereas MBD-T reduced TNF-α and PVD decreased IL-8, TNF-α, and ICAM. No significant between-diet differences in change were observed for fecal SCFAs or bile acids. In summary, over 12 weeks in a free-living setting, a MBD increased several mechanistic biomarkers associated with CRC, while α-tocopherol supplementation attenuated some adverse diet-related effects. In contrast, a PVD was associated with a more favorable biochemical and inflammatory profile. These findings reflect short-term modulation of mechanistic biomarkers rather than CRC outcomes. Trial Registration: ClinicalTrials.gov Identifier: NCT03416777. Registered 03/05/2018.

Background Apolipoproteins have been recently proposed as novel markers of cardiovascular disease (CVD) risk. However, evidence regarding effects of diet on apolipoproteins is limited. Aim To compare the effects of Mediterranean diet (MD) and lacto-ovo vegetarian diet (VD) on apolipoproteins and traditional CVD risk factors in participants with low-to-moderate CVD risk. Methods Fifty-two participants (39 women; 49.1 ± 12.4 years), followed MD and VD for 3 months each. Medical and dietary information was collected at the baseline. Anthropometric parameters and blood samples were obtained at the beginning and the end of interventions. Results MD and VD resulted in significant improvement in anthropometric and lipid profiles. Both diets led to a reduction in most of the inflammatory parameters. As for apolipoproteins, a significant change was observed for ApoC-I after VD (+ 24.4%; p  = 0.020). MD led to a negative correlation between ApoC-III and carbohydrates (R = − 0.29; p  = 0.039) whereas VD between ApoD and saturated fats (R = − 0.38; p  = 0.006). A positive correlation emerged after VD between HDL and ApoD (R = 0.33; p  = 0.017) and after MD between plasma triglycerides and ApoC-I (R = 0.32; p  = 0.020) and ApoD (R = 0.30; p  = 0.031). IL-17 resulted to be positively correlated with ApoB after MD (R = 0.31; p  = 0.028) and with ApoC-III after VD (R = 0.32; p  = 0.019). Subgroup analysis revealed positive effects on apolipoproteins from both diets, especially in women, individuals older than 50 years-old or with < 3 CVD risk factors. Conclusions Both diets seem to improve CVD risk, however, MD showed a greater positive effect on apolipoproteins in some subgroups, thus suggesting how diet may influence new potential markers of CVD risk. Trial registration : registered at clinicaltrials.gov (identifier: NCT02641834) on December 2015.

Ageing is a multifactorial physiological manifestation that occurs inexorably and gradually in all forms of life. This process is linked to the decay of homeostasis due to the progressive decrease in the reparative and regenerative capacity of tissues and organs, with reduced physiological reserve in response to stress. Ageing is closely related to oxidative damage and involves immunosenescence and tissue impairment or metabolic imbalances that trigger inflammation and inflammasome formation. One of the main ageing-related alterations is the dysregulation of the immune response, which results in chronic low-level, systemic inflammation, termed “inflammaging”. Genetic and epigenetic changes, as well as environmental factors, promote and/or modulate the mechanisms of ageing at the molecular, cellular, organ, and system levels. Most of these mechanisms are characterized by time-dependent patterns of variation driven by the biological clock. In this review, we describe the involvement of ageing-related processes with inflammation in relation to the functioning of the biological clock and the mechanisms operating this intricate interaction.

Background Twin pregnancies present unique challenges in maternal healthcare. However, current guidelines primarily address singleton pregnancies, resulting in a knowledge gap regarding their specific metabolic and dietary needs. This study aimed to follow women with twin pregnancies through all three trimesters, assessing basal metabolic rate (BMR), dietary intake, and diet quality. Methods A two-year prospective observational study was conducted at AOU Careggi Hospital, Florence, Italy, involving 35 twin-pregnant women, with 32 completing the study. Participants underwent calorimetric, anthropometric, and dietary assessments during the first (8–13 weeks), second (14–27 weeks), and third trimesters (28–34 weeks). BMR was measured using indirect calorimetry and compared with predictive equations. Dietary intake was evaluated using 7-day food diaries and the Medi-Lite adherence score. Results Indirect calorimetry revealed an increase in BMR by 16%, rising from 1479 ± 196 kcal in the first trimester to 1733 ± 224 kcal in the third trimester. Hronek’s equation, previously validated for singleton pregnancies, was identified as the most accurate predictive tool for estimating BMR. Dietary analysis revealed that mean daily energy intake increased from 1660 ± 244 kcal in the first trimester to 1889 ± 262 kcal in the third trimester, consistently below recommendations, with insufficient macro- and micronutrient consumption. Poor diet quality was characterized by low intake of fruits, vegetables, legumes, and fresh fish, and high consumption of processed meats, cheese, and sugar-sweetened beverages. Adherence to the Mediterranean diet was moderate across all three trimesters. Conclusions This study highlights the increased energy demands and nutritional inadequacies in twin pregnancies, underscoring the need for tailored dietary guidelines and interventions.

Repetitive or prolonged muscle contractions induce muscular fatigue, defined as the inability of the muscle to maintain the initial tension or power output. In the present experiments, made on intact fiber bundles from FDB mouse, fatigue and recovery from fatigue were investigated at 24°C and 35°C. Force and stiffness were measured during tetani elicited every 90 s during the pre-fatigue control phase and recovery and every 1.5 s during the fatiguing phase made of 105 consecutive tetani. The results showed that force decline could be split in an initial phase followed by a later one. Loss of force during the first phase was smaller and slower at 35°C than at 24°C, whereas force decline during the later phase was greater at 35°C so that total force depression at the end of fatigue was the same at both temperatures. The initial force decline occurred without great reduction of fiber stiffness and was attributed to a decrease of the average force per attached crossbridge. Force decline during the later phase was accompanied by a proportional stiffness decrease and was attributed to a decrease of the number of attached crossbridge. Similarly to fatigue, at both 24 and 35°C, force recovery occurred in two phases: the first associated with the recovery of the average force per attached crossbridge and the second due to the recovery of the pre-fatigue attached crossbridge number. These changes, symmetrical to those occurring during fatigue, are consistent with the idea that, i) initial phase is due to the direct fast inhibitory effect of [Pi]i increase during fatigue on crossbridge force; ii) the second phase is due to the delayed reduction of Ca(2+) release and /or reduction of the Ca(2+) sensitivity of the myofibrils due to high [Pi]i.

When skeletal muscles are stretched during activation in the absence of myosin-actin interactions, the force increases significantly. The force remains elevated throughout the activation period. The mechanism behind this non-crossbridge force, referred to as static tension , is unknown and generates debate in the literature. It has been suggested that the static tension is caused by Ca 2+ -induced changes in the properties of titin molecules that happens during activation and stretch, but a comprehensive evaluation of such possibility is still lacking. This paper reviews the general characteristics of the static tension, and evaluates the proposed mechanism by which titin may change the force upon stretch. Evidence is presented suggesting that an increase in intracellular Ca 2+ concentration leads to Ca 2+ binding to the PEVK region of titin. Such binding increases titin stiffness, which increases the overall sarcomere stiffness and causes the static tension. If this form of Ca 2+ -induced increase in titin stiffness is confirmed in future studies, it may have large implications for understating of the basic mechanisms of muscle contraction.

Fibromyalgia (FM) is a multifactorial syndrome of unknown etiology, characterized by widespread chronic pain and various somatic and psychological manifestations. The management of FM requires a multidisciplinary approach combining both pharmacological and nonpharmacological strategies. Among nonpharmacological strategies, growing evidence suggests a potential beneficial role for nutrition. This review summarizes the possible relationship between FM and nutrition, exploring the available evidence on the effect of dietary supplements and dietary interventions in these patients. Analysis of the literature has shown that the role of dietary supplements remains controversial, although clinical trials with vitamin D, magnesium, iron and probiotics’ supplementation show promising results. With regard to dietary interventions, the administration of olive oil, the replacement diet with ancient grains, low-calorie diets, the low FODMAPs diet, the gluten-free diet, the monosodium glutamate and aspartame-free diet, vegetarian diets as well as the Mediterranean diet all appear to be effective in reducing the FM symptoms. These results may suggest that weight loss, together with the psychosomatic component of the disease, should be taken into account. Therefore, although dietary aspects appear to be a promising complementary approach to the treatment of FM, further research is needed to provide the most effective strategies for the management of FM.

Force responses to fast ramp stretches of various amplitude and velocity, applied during tetanic contractions, were measured in single intact fibers from frog tibialis anterior muscle. Experiments were performed at 14°C at ∼2.1 μm sarcomere length on fibers bathed in Ringer’s solution containing various concentrations of 2,3-butanedione monoxime (BDM) to greatly reduce the isometric tension. The fast tension transient produced by the stretch was followed by a period, lasting until relaxation, during which the tension remained constant to a value that greatly exceeded the isometric tension. The excess of tension was termed “static tension,” and the ratio between the force and the accompanying sarcomere length change was termed “static stiffness.” The static stiffness was independent of the active tension developed by the fiber, and independent of stretch amplitude and stretching velocity in the whole range tested; it increased with sarcomere length in the range 2.1–2.8 μm, to decrease again at longer lengths. Static stiffness increased well ahead of tension during the tetanus rise, and fell ahead of tension during relaxation. These results suggest that activation increased the stiffness of some sarcomeric structure(s) outside the cross-bridges.

Information on the consumption of ultra-processed foods (UPF) in relation to an adherence to the Mediterranean diet (MD) is limited. Our aim was to assess UPF consumption in a group of Italian adults and to evaluate the relationship with the MD adherence. A total of 670 participants (median age: 30 years) were included in the analysis. The consumption of UPF was assessed through the NOVA Food Frequency Questionnaire (NFFQ). Adherence to the MD was assessed through the Medi-Lite score. The percentage of UPF in the diet was 16.4% corresponding to 299 g of UPF per day. These amounts were significantly (p < 0.05) higher in men than in women and came mainly from ready-to-eat meals or pre-packaged bread, bread alternatives, pizza, frozen potato chips (24.5% of total UPF intake), pre-packaged biscuits and sweets (20.7%), soft drinks (15.8%), and dairy products such as flavored yogurt (12%). As to the MD adherence, a significant inverse association between the Medi-Lite score and the percentage of UPF in the diet (R = −0.35; p < 0.001) was observed. Participants with a low adherence to the MD had a significantly higher contribution of UPF in the diet (22.2%) compared to those with a moderate (16.2%) and high (12.6%) adherence. In terms of individual UPF, the largest difference between low and high MD adherents was observed for pre-packaged biscuits and sweets, soft and energy drinks, sausages and other reconstituted meat products, and pre-packaged bread and bread alternatives. These results suggest that public health strategies are needed to implement more effective actions to promote healthy eating habits in the population.