Claudia Vetrani

Article: Diet quality in patients with treatment-resistant schizophrenia: time for improving nutritional recommendations - Minerva Endocrinology 2024 Nov 20 - Minerva Medica - Journals

The Mediterranean diet (MD) relies on a specific food consumption pattern that has been given pleiotropic effects on human health. However, even foods typically considered beneficial within the MD framework may vary in macronutrient composition, potentially leading to imbalanced or unhealthy dietary profiles despite overall adherence. To date, no study has evaluated the total energy intake and percentage macronutrient composition in a cohort of adult individuals stratified by their adherence to MD. We aimed to investigate the total energy intake and macronutrient composition among individuals stratified by adherence to MD, and its association with indices of adiposity and inflammation. A cross-sectional study was conducted in 1342 volunteers. Participants underwent clinical examination (anthropometry, body composition, and high-sensitivity C-reactive protein assessment), and nutritional data collection, including adherence to MD (PREDIMED questionnaire) and habitual diet composition (7-day food records). The associations between PREDIMED score, macronutrient composition, and clinical outcomes were explored by Pearson’s correlation. Linear regression analysis was used to assess the macronutrient that best predicted adherence to MD. Participants with high adherence to MD (H-MD) presented lower intake of carbohydrate, while higher protein and fat amounts than individuals with medium (M-HD) or low (L-MD) adherence to MD. The H-MD group showed lower adiposity (body mass index, waist circumference, and fat mass) and C-reactive protein concentrations than individuals in the M-MD and L-MD groups p < 0.001 for all comparisons). Linear regression analysis showed low carbohydrate intake as the best predictor of high PREDIMED score (β: -0.875; p < 0.001). H-MD is characterised by lower carbohydrate, higher protein and fat intakes than those usually reported in nutritional recommendations. This profile was significantly associated with lower adiposity and inflammation. A low carbohydrate amount was the best predictor of H-MD, suggesting that dietary carbohydrate should be on the lower side of the recommended range.

The circadian clock is an endogenous timekeeping system that regulates various physiological and behavioral processes. Recently, it has been shown that the timing of physical activity and food intake can significantly influence metabolic muscle health. Some recent clinical evidence has shown that physical activity practiced in the late afternoon can be more effective in terms of performance and muscle strength. Preclinical studies have highlighted that the explanation for this effect lies in the different daily expression in the muscle of clock genes and clock-controlled genes involved in muscle development and hypertrophy. In conjunction with scientific advances in understanding the molecular mechanisms that regulate circadian rhythms and muscle trophy, chrono-nutrition has gained scientific resonance and has become a promising field, aimed at understanding the regulation of body metabolism. Clinical and preclinical studies have shown that protein consumption at specific circadian time points during the day, or precisely after exercise, can activate signaling pathways involved in muscle protein synthesis and, thus, favor skeletal muscle mass development as well as mitochondrial biogenesis, thereby improving skeletal muscle cell energy production and function. On the other hand, some studies have shown that the consumption of carbohydrates immediately after exercise increases insulin secretion, which facilitates glucose uptake by muscle cells to replenish glycogen. This review summarizes the current scientific literature concerning chrono-exercise and chrono-nutrition and muscle health, focusing on molecular mechanisms involving the circadian regulation of muscle mass, strength, and health. Understanding the intricate molecular relationship between circadian rhythms, exercise, nutrition, and muscle metabolism is essential for optimizing nutritional strategies to prevent or treat muscle wasting. In addition, tailoring protein and carbohydrate intake to timing and individual needs can improve muscle maintenance, growth, and performance.

Introduction: The RISKMet project aims to: (1) identify risk factors for metabolic syndrome (MetS) by comparing patients with and without MetS; (2) characterise patients treated with second-generation antipsychotics (SGAs) about MetS diagnosis; (3) study behavioural patterns, including physical activity (PA) and dietary habits, in patients and healthy individuals using a prospective cohort design. Method: The RISKMet project investigates MetS in individuals treated with SGAs, focusing on both adult and paediatric populations. The study utilizes a case-control design to examine potential risk factors for MetS, categorizing participants as MetS+ considered as “Cases” and MetS- considered as “Controls” matched by sex and age. The evaluation of factors such as MetS, lifestyle habits, and environmental influences is conducted at two time points, T0 and T3, after 3 months. Subsequently, the project aims to assess body parameters, including physical examinations, and blood, and stool sample collection, to evaluate metabolic markers and the impact of SGAs. The analysis includes pharmacological treatment data and genetic variability. Behavioural markers related to lifestyle, eating behaviour, PA, and mood are assessed at both T0 and T3 using interviews, accelerometers, and a mobile app. The study aims to improve mental and physical well-being in SGA-treated individuals, establish a biobank for MetS research, build an evidence base for physical health programs, and develop preventive strategies for SGA-related comorbidities. Conclusions: This project innovates MetS monitoring in psychiatry by using intensive digital phenotyping, identifying biochemical markers, assessing familial risks, and including genetically similar healthy controls. Study registration number: ISRCTN18419418 at www.isrctn.com.

Background: Mounting evidence has shown that incarceration can affect the health and well-being of individuals and increase the risk of noncommunicable diseases (NCDs). Diet quality is known to be one of the main determinants of risk of NCDs, and dietary changes are the first approach used in primary care to reduce the incidence of NCDs. Objective: This scoping review aimed to summarize the evidence for (1) the diet quality of inmates, and (2) the effect of nutritional intervention in prison systems. In addition, we aimed to describe limitations in the current literature and to suggest potential future research areas. Method: A systematic search was performed in 2 databases (PubMed and Web of Science) using predefined search terms and covering the period May 2023 to June 2023. Additionally, reference lists from the retrieved studies were hand-searched to identify any additional relevant publications. The identified literature was screened based on defined search strategies, criteria, and research questions defined using the PICo (population or problem, interest, and context) framework. The review was conducted referring to the PRISMA-ScR and the PICo framework. Results: A total of 19 studies out of 63 initially identified records were included in this review (11 cross-sectional evaluations and 9 intervention-based studies). In almost all studies, assessment of the diet quality of menus showed the menus to be nutritionally adequate, except for having a higher-than-recommended intake of total energy, saturated fatty acids, sodium, cholesterol, and sugar. In addition, some studies reported a lower-than-recommended intake of fiber, magnesium, potassium, vitamins D, E, and A, and omega-3 fatty acids. Nutritional interventions were mainly planned in the form of workshops, seminars, and written material to deliver information on healthy dietary choices. Although no significant changes in inmates’ dietary choices were observed in any of the studies, a high participation rate was detected. Conclusion: Inmates might require additional prevention intervention to reduce their susceptibility to cardiometabolic diseases by virtue of their isolation from community facilities. Interventions should be tailored to the characteristics of prison settings and inmates to increase adherence to nutritional recommendations.

Low-grade chronic inflammation linked to obesity can lead to alterations in biomarkers of iron status. The aim of this study was to investigate the primary determinant of serum iron levels among anthropometric measurements, body fat, and serum biomarkers of low-grade chronic inflammation in a group of adult individuals with severe obesity. We enrolled 114 individuals (84 females; 30 males) aged 40.96 ± 12.54 years. Weight and body mass index (BMI) were 121.20 ± 22.33 kg and 44.94 ± 7.29 kg/m², respectively. Some 30% of individuals had class-II obesity (BMI ≥ 35 ≤ 39.9 kg/m²) and 70% had class-III obesity (BMI ≥ 40 kg/m²). A weak, albeit significant, inverse correlation was found between serum iron levels and c-reactive protein (CRP) (r = −0.259, p = 0.008), fibrinogen (r = −0.261, p = 0.006), BMI (r = −0.186, p = 0.04), waist circumference (WC) (r = −0.265, p = 0.004), and fat mass % (r = −0.285, p = 0.003). With multiple linear regression analysis including CRP, fibrinogen, BMI, WC, and fat mass % as independent variables and serum iron levels as dependent variable, WC was entered in the first step (p = 0.001), which was followed by fat mass % (p = 0.047) and CRP (p = 0.047). Grouping the individuals according to the interquartile range of BMI, WC, and fat mass % (Q1–Q4), the lowest serum iron levels were found in Q4 groups of WC and fat mass % (p = 0.02), while no significant differences were found between groups in BMI quartiles. In conclusion, in our study, population serum iron levels were inversely associated with BMI, visceral obesity, fat mass %, CRP, and fibrinogen, but WC was the major negative predictor of serum iron level. These results supported the fact that visceral distribution of body fat, more than obesity per se, was associated with low serum iron levels in adult individuals with severe obesity.

High adherence to the Mediterranean Diet (MD) is associated with a lower risk of type 2 diabetes. However, it is less clear whether the different MD food items might influence specific biological functions related to glucose tolerance, i.e., insulin resistance (IR) and/or secretion (IS). Thus, this cross-sectional study aimed to investigate the relationship between adherence to MD and IR, insulin sensitivity, and IS in individuals with overweight/obesity. Participants (62 individuals; 7M/55F; mean age 49 ± 15 years; mean BMI 35.8 ± 6.7 kg/m²) underwent a 75 g oral glucose tolerance test (OGTT) to assess plasma glucose and insulin concentrations. These parameters were used for the calculation of validated IR indices (Homeostatic Model Assessment for Insulin Resistance (HOMA-IR), Homeostatic Model Assessment for β-cell function (HOMA-β)), as well as insulin sensitivity indices (insulin sensitivity index (ISI), oral glucose insulin sensitivity (OGIS)). MD adherence was gauged using the PREDIMED questionnaire. Bivariate correlations were used to highlight the association between OGTT-derived indices and MD adherence (PREDIMED score) or specific foodstuffs related to MD. Despite there being no significant differences in BMI, impaired fasting glucose (IFG), and impaired glucose tolerance (IGT), the high MD adherence group presented lower HOMA-IR (p = 0.022) and higher ISI (p = 0.033) compared to other groups. High MD adherence was inversely correlated with HOMA-IR (r = −0.400; p = 0.004) and directly correlated with ISI (r = 0.296, p = 0.039). Fish consumption, a key component of MD, exhibited significant associations: it was directly correlated to ISI (r = 0.394, p = 0.005) and inversely related to HOMA-IR (r = −0.327, p = 0.019) and β-cell function (r = −0.489, p < 0.001). In conclusion, a high MD adherence, and in particular the consumption of fish, is associated with a decreased IR in individuals with overweight/obesity.

Purpose: There is a growing awareness of the importance of understanding gender differences in obesity. The aim of this short review was to revise the current evidence on anthropometric characteristics and nutritional and pharmacological aspects of obesity from a gender perspective. Methods: A literature search within PubMed was performed. Selected publications related to obesity and gender differences were reviewed. Results: The prevalence of obesity among men is higher than in women, but women have a higher percentage of body fat content compared to men, and gender appears to be an important factor in the manifestation of central (android) or peripheral (gynoid) obesity. In addition, while in most clinical trials, women are still underrepresented, in clinical registration trials of anti-obesity drugs, women are commonly up-represented and gender-specific analysis is uncommon. Considering that adipose tissue is one of the factors affecting the volume of distribution of many drugs, mainly lipophilic drugs, gender differences might be expected in the pharmacokinetics and pharmacodynamics of anti-obesity drugs. Indeed, although Liraglutide 3 mg, a long-acting glucagon-like peptide-1 receptor agonist, and naltrexone/bupropion display lipophilic properties, currently, a gender–dose adjustment for both these drugs administration is not recommended. In addition, despite that predicted responders to treatment offer substantial opportunities for efficient use, especially of expensive new therapies, such as anti-obesity drugs, data on gender differences to identify early responders to both these have not yet been investigated. Finally, bariatric surgery gender disparity reflects healthcare practices. Weight loss similar, but differing effects: women need more correction and face psychology challenges; men have worse physiology and fewer comorbidity improvements. Conclusion: Gender differences exist in obesity prevalence and phenotype, body fat distribution, drug efficacy, clinical trial representation, and different secondary effects of bariatric surgery. Gender is an important variable in obesity analysis.

In the pathogenesis of type 2 diabetes mellitus (T2DM), diet plays a key role. Individualized medical nutritional therapy, as part of lifestyle optimization, is one of the cornerstones for the management of T2DM and has been shown to improve metabolic outcomes. This paper discusses major aspects of the nutritional intervention (including macro- and micronutrients, nutraceuticals, and supplements), with key practical advice. Various eating patterns, such as the Mediterranean-style, low-carbohydrate, vegetarian or plant-based diets, as well as healthy eating plans with caloric deficits have been proven to have beneficial effects for patients with T2DM. So far, the evidence does not support a specific macronutrient distribution and meal plans should be individualized. Reducing the overall carbohydrate intake and replacing high glycemic index (GI) foods with low GI foods have been shown as valid options for patients with T2DM to improve glycemic control. Additionally, evidence supports the current recommendation to reduce the intake of free sugars to less than 10% of total energy intake, since their excessive intake promotes weight gain. The quality of fats seems to be rather important and the substitution of saturated and trans fatty acids with foods rich in monounsaturated and polyunsaturated fats lowers cardiovascular risk and improves glucose metabolism. There is no benefit of supplementation with antioxidants, such as carotene, vitamins E and C, or other micronutrients, due to the lack of consistent evidence showing efficacy and long-term safety. Some studies suggest possible beneficial metabolic effects of nutraceuticals in patients with T2DM, but more evidence about their efficacy and safety is still needed.