BDNF Gene as a Precision Skill of Obesity Management.

The scarcity of the results obtained for the treatment of obesity leads us to consider new strategies, contemplating all the factors involved in the development of the disease. One of the key molecules for controlling body weight and energy homeostasis is the brain-derived neurotrophic factor (BDNF). This work summarizes the mechanisms in which BDNF gene regulates this multifactorial disease. In addition, we discuss the role of other BDNF polymorphisms as genetic determinants of obesity. In this context, a total of 14 SNPs near or inside BDNF/BDNF-AS related to BMI were identified in various GWASs. Finally, we assess gene-diet interaction as a novel tool to prevent obesity and formulate solid and personalized nutritional management. Our research group has performed the first study on the association of BDNF-AS rs925946 polymorphism and calcium intake as potential modulators of the nutritional status. Although these results should be confirmed in future studies, they open the path for new prevention opportunities.

Precision nutrition impact on metabolic health and quality of life in aging population after a 3-month intervention: A randomized intervention.

OBJECTIVES: Innovative precision dietary procedures are required to promote healthy aging. This study aimed to evaluate the effects of a personalised strategy based on the inclusion of individualised foods and digital tools on overall health status and quality of life within a follow-up of 3 months in older adults with overweight or obesity. METHODS: 127 men and women aged between 50 and 80 years with overweight/obesity participated in the study-between January 2020 and September 2020 at the Center for Nutrition Research-University of Navarra and IMDEA-ALIMENTACIÓN-and were randomly assigned to a usual-care group (standard recommendations) or precision group (precision nutrition strategy based on the inclusion of individualised foods and a mobile application). Anthropometry, body fat percentage, biochemical parameters, diet, and quality of life (SF-36 Health Survey) were assessed at baseline and after 3 months. RESULTS: Both strategies were found to improve overall metabolic health; however, the precision approach demonstrated significantly better outcomes. The precision strategy reduced body weight at 3 months (-4.3 kg; p < 0.001) with significant improvements in body fat percentage, blood pressure and general metabolic health (glycated haemoglobin; alanine aminotransferase; aspartate aminotransferase; hepatic steatosis index) in comparison with the standard recommendations. The precision approach significantly enhanced the quality of life (SF-36) of individuals, with additional improvements in emotional well-being (p = 0.024) and vitality (p = 0.008). Adherence to the Mediterranean diet was significantly associated with a higher quality of life and vitality. CONCLUSION: These results support the benefit of precision nutrition approaches for promoting healthy aging and emotional well-being, enhancing the quality of life in aging populations, during the COVID-19 pandemic.

Dietary and Physical Activity Habits as Conditioning Factors of Nutritional Status among Children of GENYAL Study.

Excess weight (EW) in children has become a severe public health problem. The present study aimed to describe the main lifestyle characteristics and their possible association with nutritional status in a group of schoolchildren enrolled in the GENYAL study, where 221 children in the first or second grade of primary education (6-9 years old) were included. Anthropometric (BMI and bioimpedance), dietary intake (twice-repeated 24 h food record), and physical activity (twice-repeated 24 h physical activity questionnaire) data were collected. Logistic and linear regressions, with p-values adjusted for multiple tests by Bonferroni's method and with sex and age as covariates, were applied. The prevalence of EW was 19%, 25.4%, and 32.2%, according to Orbegozo Foundation, IOFT, and WHO criteria, respectively. The results showed a significant association between schoolchildren's nutritional status and energy balance, defined as the ratio of estimated energy intake to estimated energy expenditure (%), (ß = -1.49 (-1.9-1.07), p < 0.01) and KIDMED Mediterranean Diet Quality Index score (ß = -0.19 (95% IC -0.38-0), p = 0.04), and between the availability of TV or other technological devices in their room and the child's BMI (ß = 1.15 (95% IC 0.20-2.10), p = 0.017) and their fat mass (ß = 3.28 (95% IC 0.69-5.87), p = 0.013). The number of dairy servings/day had a protective effect against EW (OR = 0.48 (0.29-0.75), p adjusted = 0.05)). Studying lifestyle factors associated with obesity is essential for developing tools and strategies for obesity prevention in children.

"GENYAL" Study to Childhood Obesity Prevention: Methodology and Preliminary Results.

Objective: This article describes the methodology and summarizes some preliminary results of the GENYAL study aiming to design and validate a predictive model, considering both environmental and genetic factors, that identifies children who would benefit most from actions aimed at reducing the risk of obesity and its complications. Design: The study is a cluster randomized clinical trial with 5-year follow-up. The initial evaluation was carried out in 2017. The schools were randomly split into intervention (nutritional education) and control schools. Anthropometric measurements, social and health as well as dietary and physical activity data of schoolchildren and their families are annually collected. A total of 26 single nucleotide polymorphisms (SNPs) were assessed. Machine Learning models are being designed to predict obesity phenotypes after the 5-year follow-up. Settings: Six schools in Madrid. Participants: A total of 221 schoolchildren (6-8 years old). Results: Collected results show that the prevalence of excess weight was 19.0, 25.4, and 32.2% (according to World Health Organization, International Obesity Task Force and Orbegozo Foundation criteria, respectively). Associations between the nutritional state of children with mother BMI [ß = 0.21 (0.13-0.3), p (adjusted) <0.001], geographical location of the school [OR = 2.74 (1.24-6.22), p (adjusted) = 0.06], dairy servings per day [OR = 0.48 (0.29-0.75), p (adjusted) = 0.05] and 8 SNPs [rs1260326, rs780094, rs10913469, rs328, rs7647305, rs3101336, rs2568958, rs925946; p (not adjusted) <0.05] were found. Conclusions: These baseline data support the evidence that environmental and genetic factors play a role in the development of childhood obesity. After 5-year follow-up, the GENYAL study pretends to validate the predictive model as a new strategy to fight against obesity. Clinical Trial Registration: This study has been registered in ClinicalTrials.gov with the identifier NCT03419520, https://clinicaltrials.gov/ct2/show/NCT03419520.

Modifiable Innate Biology within the Gut-Brain Axis for Alzheimer's Disease.

Alzheimer's disease (AD) is a prototypical inflammation-associated loss of cognitive function, with approximately 90% of the AD burden associated with invading myeloid cells controlling the function of the resident microglia. This indicates that the immune microenvironment has a pivotal role in the pathogenesis of the disease. Multiple peripheral stimuli, conditioned by complex and varied interactions between signals that stem at the intestinal level and neuroimmune processes, are involved in the progression and severity of AD. Conceivably, the targeting of critical innate immune signals and cells is achievable, influencing immune and metabolic health within the gut-brain axis. Considerable progress has been made, modulating many different metabolic and immune alterations that can drive AD development. However, non-pharmacological strategies targeting immunometabolic processes affecting neuroinflammation in AD treatment remain general and, at this point, are applied to all patients regardless of disease features. Despite these possibilities, improved knowledge of the relative contribution of the different innate immune cells and molecules comprising the chronically inflamed brain network to AD pathogenesis, and elucidation of the network hierarchy, are needed for planning potent preventive and/or therapeutic interventions. Moreover, an integrative perspective addressing transdisciplinary fields can significantly contribute to molecular pathological epidemiology, improving the health and quality of life of AD patients. This review is intended to gather modifiable immunometabolic processes based on their importance in the prevention and management of AD.

Ranking of a wide multidomain set of predictor variables of children obesity by machine learning variable importance techniques.

The increased prevalence of childhood obesity is expected to translate in the near future into a concomitant soaring of multiple cardio-metabolic diseases. Obesity has a complex, multifactorial etiology, that includes multiple and multidomain potential risk factors: genetics, dietary and physical activity habits, socio-economic environment, lifestyle, etc. In addition, all these factors are expected to exert their influence through a specific and especially convoluted way during childhood, given the fast growth along this period. Machine Learning methods are the appropriate tools to model this complexity, given their ability to cope with high-dimensional, non-linear data. Here, we have analyzed by Machine Learning a sample of 221 children (6-9 years) from Madrid, Spain. Both Random Forest and Gradient Boosting Machine models have been derived to predict the body mass index from a wide set of 190 multidomain variables (including age, sex, genetic polymorphisms, lifestyle, socio-economic, diet, exercise, and gestation ones). A consensus relative importance of the predictors has been estimated through variable importance measures, implemented robustly through an iterative process that included permutation and multiple imputation. We expect this analysis will help to shed light on the most important variables associated to childhood obesity, in order to choose better treatments for its prevention.

Food Implications in Central Sensitization Syndromes.

Fibromyalgia (FM), chronic fatigue syndrome (CFS) and multiple chemical sensitivity (MCS) are some of the central sensitization syndromes (CSSs). The complexity of their diagnosis, the high interindividual heterogeneity and the existence of multi-syndromic patients requires a multifaceted treatment. The scientific literature is contradictory regarding the role of food in CSS, and evidence on the role of nutrition in MCS is particularly scarce. This review consists in gathering information about the current status of dietary recommendations (i.e., special dietary interventions, the role of additives, presence of micronutrient deficiencies, nutritional supplements and elimination of other nutrients and substances) and discussing the scientific evidence in depth to shed light on appropriate nutritional treatment managements for CSS patients. Current indications show that dietary modifications may vastly improve the patients' quality of life at a low cost. We suggest personalized treatment, taking into consideration the severity of the disease symptoms, quality of life, coexistence with other diseases, pharmacological treatment, changing clinical characteristics, nutritional status, energy requirements and food tolerances, among others, as the best ways to tailor specific dietary interventions. These approaches will partially overcome the lack of scientific and clinical research on MSC. Patients should also be advised on the serious consequences of following dietary guidelines without a dietitian's and clinician's supervision.

The Q223R Polymorphism of the Leptin Receptor Gene as a Predictor of Weight Gain in Childhood Obesity and the Identification of Possible Factors Involved.

(1) Background: Childhood rapid weight gain during development has been postulated as a predictor of obesity. The objective of this study was to investigate the effect of single nucleotide polymorphisms (SNPs) on the annual weight gain and height growth, as well as identifying possible lifestyle factors involved. (2) Methods: As part of the GENYAL study, 221 children (6-8 years old) of Madrid (Spain) were enrolled. A total of 11 SNPs associated with high childhood body mass indexes (BMIs) were assessed. Anthropometric measurements, dietary and physical activity data, were collected in 2017 and 2018. Bonferroni-corrected linear models were used to fit the data. (3) Results: A significant association between the Q223R LEPR and the weight growth was found, showing a different behavior between GA and GG genotypes (p = 0.001). Regarding lifestyle factors, an interaction between Q223R genotypes and total active weekly hours/week to predict the weight growth (kg/year) was observed (p = 0.023). In all the genotypes, a beneficial effect against rapid weight growth was observed, but the effect size of the interaction was much more significant in homozygous (GG) minor homozygous (ß = -0.61 (-0.95, -0.26) versus heterozygous (AG) and wild-type homozygous (AA) genotypes (ß = -0.07 (-0.24, 0.09) and ß = -0.12 (-0.32, 0.08), respectively). (4) Conclusions: These results may contribute to more personalized recommendations to prevent childhood obesity.

A Potential Endurance Algorithm Prediction in the Field of Sports Performance.

Sport performance is influenced by several factors, including genetic susceptibility. In the past years, specific single nucleotide polymorphisms have been associated to sport performance; however, these effects should be considered in multivariable prediction systems since they are related to a polygenic inheritance. The aim of this study was to design a genetic endurance prediction score (GES) of endurance performance and analyze its association with anthropometric, nutritional and sport efficiency variables in a cross-sectional study within fifteen male cyclists. A statistically significant positive relationship between GES and the VO2 maximum (P = 0.033), VO2 VT1 (P = 0.049) and VO2 VT2 (P < 0.001) was observed. Moreover, additional remarkable associations between genotype and the anthropometric, nutritional and sport performance variables, were achieved. In addition, an interesting link between the habit of consuming caffeinated beverages and the GES was observed. The outcomes of the present study indicate a potential use of this genetic prediction algorithm in the sports' field, which may facilitate the finding of genetically talented athletes, improve their training and food habits, as well as help in the improvement of physical conditions of amateurs.

Association of calcium and dairy product consumption with childhood obesity and the presence of a Brain Derived Neurotropic Factor-Antisense (BDNF-AS) polymorphism.

BACKGROUND & AIMS: Calcium and dairy products have multiple health benefits. The objective of this work was to evaluate the association between calcium/dairy intake, blood pressure, the BDNF-AS rs925946 polymorphism and nutritional status in a group of schoolchildren. METHODS: As part of the GENYAL study to childhood obesity prevention, 221 children belonging to different areas of the Community of Madrid were enrolled. Anthropometric and dietary data were collected, and children were genotyped according to the rs925946 polymorphism. Adjusted logistic and linear models were used to describe the data. RESULTS: A significantly lower consumption of calcium in overweight versus normal weight children was observed (811.0 ± 174.1; 859.0 ± 195.9; 954.0 ± 223.1 mg; for obesity, overweight and normal weight, respectively, p = 0.010). Moreover, an inverse association between blood pressures and calcium intake was detected (ß = -0.006 (-0.011, -3e-4)), p = 0.040. The number of dairy servings/day showed a protective effect against overweight (OR = 0.48 (0.29, 0.75), p = 0.001). Finally, common homozygous children (GG) showed an inverse association between the calcium intake and the BMI (ß = -0.003 (-0.006, -0.001), p = 0.004), which was not observed in children carrying the T allele (ß = -1.3e-4 (-0.0022, 0.0024), p = 0.93). CONCLUSION: Calcium and dairy were strongly associated with the nutritional status and blood pressure. The identification of differential effects of calcium/dairy consumption on the nutritional status according to genetics may contribute to the personalization of future nutritional advice. TRIAL REGISTRATION: This study is registered at www.clinicaltrials.govNCT03419520.

Characteristics and determinants of dietary intake and physical activity in a group of patients with multiple chemical sensitivity. / Características y condicionantes de la ingesta dietética y actividad física en un grupo de pacientes diagnosticados de sensibilidad química múltiple.

BACKGROUND AND OBJECTIVE: Multiple chemical sensitivity (MCS) is a complex, acquired, chronic syndrome of multifactorial etiology with multiple symptoms. The aim of the study was to assess the nutritional habits, dietary characteristics and physical activity, as well as their determinants, of a population diagnosed with MCS, which may allow for a more precise approach to nutritional improvement. PATIENTS AND METHOD: A descriptive, cross-sectional study in patients diagnosed with MCS. Information was collected using adapted questionnaires. Data included presence of comorbidities, nutritional (use of supplements, types of diet) and food purchasing habits. Dietary intake, food intolerances, and physical activity were also recorded. RESULTS: The study included of 52 patients (48 female) aged 50.9±10.3 years. Diagnosis of MCS was commonly associated to chronic fatigue syndrome (70.1%), fibromyalgia (65.4%), or electrosensitivity (51.9%). The most common comorbidities were irritable bowel, gastroesophageal reflux, and depression/anxiety-depressive disorder. Exclusion diets were followed by 57.7%, 52.1% commonly used supplements (6.4±5.2 per person), and 16.0% took more than 10 daily. A high proportion of volunteers did not take the recommended amounts of dairy products (84.3%), fruit (82.3%), and cereals (64.7%), the foods to which intolerance was greatest. As regards physical activity, active subjects only represented 12.5%. CONCLUSIONS: The data collected support the need to improve food pattern and to perform physical activity according to individual characteristics. Nutritional education and diet personalization could prevent incomplete, monotonous, and unbalanced diets which impair quality of life and physiological status.

Multiple chemical sensitivity: Genotypic characterization, nutritional status and quality of life in 52 patients. / Sensibilidad química múltiple: caracterización genotípica, estado nutricional y calidad de vida de 52 pacientes.

BACKGROUND AND OBJECTIVES: Multiple chemical sensitivity (MCS) is a chronic, multisystem syndrome of unknown etiology. The aim of the present study was to describe the nutritional status and quality of life of patients suffering from MCS, as well as to identify potential polymorphisms associated with this illness. PATIENTS AND METHODS: A cross-sectional, descriptive study was performed on patients with a diagnosis of MCS. Data on anthropometric and body composition variables, hand muscle strength and quality of life were collected. The selection of single nucleotide polymorphisms (SNPs) was based on genes previously associated with MCS and genes involved in inflammatory and oxidative stress pathways. RESULTS: A total of 52 patients (93.2% female), with a mean age of 50.9 (10.3) years were included in the study. Among them, based on their BMI, 48% had an inadequate nutritional status (17% were underweight and 32% were overweight or obese). Thirty percent of patients had a low muscle mass for their age, 84% had muscle strength below the tenth percentile, and 51.8% had a high fat mass percentage. Regarding quality of life, all median scores were lower than those of other illnesses assessed for every subscale assessed. Statistically significant differences between patient cases and controls were found with respect to rs1801133 (MTHFR), rs174546 (FADS1) and rs1801282 (PPARγ) polymorphisms. CONCLUSION: A high percentage of patients had a poor nutritional status, low muscle strength and decreased muscle mass. These facts exacerbate the already-lower quality of life of these patients. Specific genetic polymorphisms associated with the syndrome or its pathogenesis were not identified.

Polymorphism in the CLOCK gene may influence the effect of fat intake reduction on weight loss.

OBJECTIVES: The aim of this study was to assess the effect of a weight loss treatment on obesity- associated variables with respect to the CLOCK and FTO genotypes. METHODS: In all, 179 volunteers (78% female) participated in a 12-week calorie-restriction program; hypocaloric diets of between 5442 and 10048 kJ/d were individually prescribed to all participants. Dietetic, anthropometric, and biochemical data were collected at baseline and at the end of the intervention. When treatment was over, five single nucleotide polymorphisms (SNPs) were sought in CLOCK and FTO in all participants who provided consent. Bonferroni-corrected linear regression models were used to examine the influence of interactions of the type genotype × dietetic change on obesity-associated variables. RESULTS: Variation in the CLOCK and FTO genotypes had no significant influence on the change in obesity-associated variables. The interaction genotype × percentage intake of dietary fat had a significant influence on body mass index (BMI; adjusted P = 0.03). Participants carrying CLOCK rs3749474 (TT + CT) showed a positive association between the change in percentage intake of dietary fat and change in BMI (ß = 0.044; 95% confidence interval [CI], 0.0119-0.0769; P = 0.008), whereas participants homozygous for the wild-type allele (CC) showed a negative, although nonsignificant association (ß = -0.032; 95% CI, -0.0694 to 0.036; P = 0.077). CONCLUSION: The possession of CLOCK rs3749474 may influence the effect of reducing the percentage intake of dietary fat on obesity-associated variables. Participants carrying this SNP might benefit more than others from weight loss treatment involving dietary fat restriction. The treatment of obesity might therefore be customized, depending on the alleles carried.

Características y condicionantes de la ingesta dietética y actividad física en un grupo de pacientes diagnosticados de sensibilidad química múltiple / Characteristics and determinants of dietary intake and physical activity in a group of patients with multiple chemical sensitivity

Antecedentes y objetivo: La sensibilidad química múltiple (SQM) es un síndrome complejo, adquirido, crónico y multifactorial, con amplia sintomatología. El objetivo del presente estudio fue conocer los hábitos alimentarios, las características dietéticas y la actividad física, así como sus condicionantes en un colectivo afectado de SQM, lo que permitirá un abordaje más preciso para la mejora de su estado nutricional. Pacientes y método: Estudio descriptivo y transversal en pacientes con SQM. Se recogió información mediante cuestionarios adaptados sobre presencia de comorbilidades, hábitos dietéticos (consumo de complementos/suplementos, tipos de dietas) y de compra, así como registro de ingesta dietética, intolerancias alimentarias y actividad física. Resultados: Se incluyó a 52 pacientes (48 mujeres) de 50,9 ± 10,3 años de edad media. Fue habitual el diagnóstico conjunto de SQM con síndrome de fatiga crónica (70,1%), fibromialgia (65,4%) o electrosensibilidad (51,9%). Las comorbilidades más frecuentes fueron colon irritable, reflujo gastroesofágico y depresión/trastorno ansioso-depresivo. El 57,7% seguía regímenes de exclusión. El 52,1% consumía complementos/suplementos habitualmente (6,4 ± 5,2 por persona) y el 16,0% tomaba más de 10 diarios. Fue elevado el porcentaje de voluntarios que no alcanzó las raciones aconsejadas de lácteos (84,3%), frutas (82,3%) y cereales (64,7%), coincidiendo con los alimentos con mayor intolerancia. Con respecto a la actividad física, los sujetos activos solo representaban el 12,5%. Conclusiones: Los datos obtenidos confirman la necesidad de mejora del patrón alimentario y realización de actividad física según características individuales. La educación nutricional y personalización de las pautas podrían evitar dietas incompletas, monótonas y desequilibradas que empeoren la calidad de vida y situación fisiológica

Background and objective: Multiple chemical sensitivity (MCS) is a complex, acquired, chronic syndrome of multifactorial etiology with multiple symptoms. The aim of the study was to assess the nutritional habits, dietary characteristics and physical activity, as well as their determinants, of a population diagnosed with MCS, which may allow for a more precise approach to nutritional improvement. Patients and method: A descriptive, cross-sectional study in patients diagnosed with MCS. Information was collected using adapted questionnaires. Data included presence of comorbidities, nutritional (use of supplements, types of diet) and food purchasing habits. Dietary intake, food intolerances, and physical activity were also recorded. Results: The study included of 52 patients (48 female) aged 50.9±10.3 years. Diagnosis of MCS was commonly associated to chronic fatigue syndrome (70.1%), fibromyalgia (65.4%), or electrosensitivity (51.9%). The most common comorbidities were irritable bowel, gastroesophageal reflux, and depression/anxiety-depressive disorder. Exclusion diets were followed by 57.7%, 52.1% commonly used supplements (6.4±5.2 per person), and 16.0% took more than 10 daily. A high proportion of volunteers did not take the recommended amounts of dairy products (84.3%), fruit (82.3%), and cereals (64.7%), the foods to which intolerance was greatest. As regards physical activity, active subjects only represented 12.5%. Conclusions: The data collected support the need to improve food pattern and to perform physical activity according to individual characteristics. Nutritional education and diet personalization could prevent incomplete, monotonous, and unbalanced diets which impair quality of life and physiological status

Sensibilidad química múltiple: caracterización genotípica, estado nutricional y calidad de vida de 52 pacientes / Multiple chemical sensitivity: Genotypic characterization, nutritional status and quality of life in 52 patients

Antecedentes y objetivos: La sensibilidad química múltiple (SQM) es un síndrome multisistémico y crónico, de etiología desconocida. El objetivo de este estudio fue describir el estado nutricional y la calidad de vida, así como identificar posibles polimorfismos asociados al síndrome o a su patogenia. Pacientes y métodos: Estudio epidemiológico, descriptivo y transversal en pacientes con diagnóstico de SQM. Se recogieron datos antropométricos, composición corporal, fuerza muscular y calidad de vida. La selección de single nucleotide polymorphisms (SNP, ‘polimorfismos de un solo nucleótido’) se centró en genes asociados previamente a la SQM y genes que participan en rutas de estrés oxidativo e inflamación. Resultados: Se incluyeron 52 pacientes (93,2% del sexo femenino), con una edad media de 50,9 (10,3) años. Respecto a su estado nutricional (IMC), un 48% estaba fuera de rangos de normalidad (17% desnutrición y 32% sobrepeso y obesidad). Un 30% presentó masa muscular por debajo de la referencia para la edad, un 84% una fuerza muscular inferior al percentil 10 y un 51,8% un porcentaje de masa grasa elevado. Respecto a la calidad de vida, las puntuaciones medias estuvieron por debajo de las de otras enfermedades en todas las subescalas evaluadas. Se observaron diferencias significativas en las frecuencias encontradas entre casos y controles para los SNP rs1801133 (MTHFR), rs174546 (FADS1) y rs1801282 (PPARγ). Conclusión: Un elevado porcentaje de pacientes presentó un estado nutricional anormal con masa y fuerza muscular disminuidas, lo que reduce la calidad de vida de estos pacientes, ya mermada por la sintomatología. No se identificaron polimorfismos genéticos específicos asociados al síndrome o a su patogenia (AU)

Background and objectives: Multiple chemical sensitivity (MCS) is a chronic, multisystem syndrome of unknown etiology. The aim of the present study was to describe the nutritional status and quality of life of patients suffering from MCS, as well as to identify potential polymorphisms associated with this illness. Patients and methods: A cross-sectional, descriptive study was performed on patients with a diagnosis of MCS. Data on anthropometric and body composition variables, hand muscle strength and quality of life were collected. The selection of single nucleotide polymorphisms (SNPs) was based on genes previously associated with MCS and genes involved in inflammatory and oxidative stress pathways. Results: A total of 52 patients (93.2% female), with a mean age of 50.9 (10.3) years were included in the study. Among them, based on their BMI, 48% had an inadequate nutritional status (17% were underweight and 32% were overweight or obese). Thirty percent of patients had a low muscle mass for their age, 84% had muscle strength below the tenth percentile, and 51.8% had a high fat mass percentage. Regarding quality of life, all median scores were lower than those of other illnesses assessed for every subscale assessed. Statistically significant differences between patient cases and controls were found with respect to rs1801133 (MTHFR), rs174546 (FADS1) and rs1801282 (PPARγ) polymorphisms. Conclusion: A high percentage of patients had a poor nutritional status, low muscle strength and decreased muscle mass. These facts exacerbate the already-lower quality of life of these patients. Specific genetic polymorphisms associated with the syndrome or its pathogenesis were not identified (AU)