Interaction Effects of FTO and MC4R Polymorphisms on Total Body Weight Loss, Post-Surgery Weight, and Post-Body Mass Index after Bariatric Surgery.

Bariatric surgery (BS) is considered the most effective intervention for patients with severe obesity and is used to maintain long-term weight loss and glycemic control. The aim of this study was to analyze the effects of genotypes and haplotypes of the fat mass and obesity-associated (FTO) and melanocortin 4 receptor (MC4R) genes on total body weight loss (TBWL), post-surgery weight, and post-BMI after bariatric surgery. We retrospectively selected 101 patients from Bajio High Specialty Regional Hospital, León Guanajuato, México, who underwent Roux-en-Y gastric bypass (RYGB) to determine their body mass index (BMI), blood pressure, biochemical characteristics, and comorbidities. Post-surgery, patients were referred for registered anthropometry and blood pressure. Glucose, lipid and hepatic profiles, and insulin, leptin, and ghrelin levels were measured, and rs9939609, rs9930506, and rs1421085 FTO and rs17782313 MC4R polymorphisms were genotyped. Six (4-8) years after BS, post-surgery weight was greater in carriers of the rs9939609 and rs1421085 risk genotypes. TBWL was lower for the rs9930506 and rs1421085 risk genotypes. Insulin and HOMA-IR were greater in patients with the three FTO polymorphisms. There were significant interaction effects of the rs9930506 and rs1421085 FTO risk genotypes on weight and BMI in response to BS. No association was found with the MC4R polymorphism. The genotypes and haplotypes of the FTO gene influence post-surgery weight, TBWL, insulin levels, and HOMA-IR.

Administration of Tamoxifen Can Regulate Changes in Gene Expression during the Acute Phase of Traumatic Spinal Cord Injury.

Traumatic spinal cord injury (SCI) causes irreversible damage leading to incapacity. Molecular mechanisms underlying SCI damage are not fully understood, preventing the development of novel therapies. Tamoxifen (TMX) has emerged as a promising therapy. Our aim was to identify transcriptome changes in the acute phase of SCI and the effect of Tamoxifen on those changes in a rat model of SCI. Four groups were considered: (1) Non-injured without TMX (Sham/TMX-), (2) Non-injured with TMX (Sham/TMX+), (3) injured without TMX (SCI/TMX-), and (4) injured with TMX (SCI/TMX+). Tamoxifen was administered intraperitoneally 30 min after injury, and spinal cord tissues were collected 24 h after injury. Clariom S Assays Array was used for transcriptome analysis. After comparing Sham/TMX- versus SCI/TMX-, 708 genes showed differential expression. The enriched pathways were the SCI pathway and pathways related to the inflammatory response. When comparing SCI/TMX- versus SCI/TMX+, only 30 genes showed differential expression, with no pathways enriched. Our results showed differential expression of genes related to the inflammatory response after SCI, and Tamoxifen seems to regulate gene expression changes in Ccr2 and Mmp12. Our study contributes data regarding the potential value of tamoxifen as a therapeutic resource for traumatic SCI during the acute phase.

Testing for Protein Leverage in Patients with Gastric Bypass: A Pilot Study.

INTRODUCTION: Protein leverage (PL) is the phenomenon whereby a dominant appetite for protein drives overconsumption of energy with a decline in the ratio of protein to fat and carbohydrate in the diet. PL has been independently verified in several randomized control trials, and its predictions are supported by diet surveillance data. Our aim in the present study was to test whether surgical intervention through gastric bypass will ameliorate the PL effect. METHODS: Ten patients with gastric bypass (2-5 years postsurgical time) were given ad libitum access to study food comprising 10%, 15%, or 25% protein and no access to other foods for 3 days while controlling food palatability and variety. Food intake was measured, and energy and nutrient intakes were calculated. Body weight, blood chemistry, lipid profile, hormones (insulin, leptin, and ghrelin), and creatinine were determined before and after each experimental period. RESULTS: The gastric bypass patients in our study did not show evidence for protein intake regulation as predicted under PL but ate to constant total energy intake on the 10%, 15%, and 25% protein diets with protein intake varying significantly. Patients lost weight in the three study periods, but significant weight loss was observed only on the 15% protein diet. CONCLUSION: Our results suggest that gastric bypass might disengage the PL mechanism, thus ameliorating an appetite-specific mechanism that drives energy overconsumption in modern food environments.

Analysis of Factors Associated with Outcomes of Bariatric Surgery: rs1800497 ANKK1, rs1799732 DRD2 Genetic Polymorphisms, Eating Behavior, Hedonic Hunger, and Depressive Symptoms.

INTRODUCTION: A therapeutic approach to severe obesity is bariatric surgery (BS), which is considered an effective intervention for ameliorating comorbidities such as T2DM, hypertension, dyslipidemia, and cardiovascular diseases. Some polymorphisms are considered markers for addictive disorders and hedonic hunger. We analyzed factors associated with the outcomes of BS, including rs1800497 ANKK1 and rs1799732 DRD2 polymorphisms, eating behavior, hedonic hunger, and depressive symptoms. METHODS: We retrospectively selected 101 patients who underwent BS and agreed to participate. The previous conditions to BS, such as body mass index (BMI), systolic blood pressure (SBP), diastolic blood pressure (DBP), and comorbidities, were registered; the scholarship value was evaluated as the total number of years of scholarly education. To evaluate the post-surgery conditions of the participants, we took blood samples, anthropometric measures, and 3 questionnaires to evaluate eating behavior (TFEQ-R18), hedonic hunger (PFS), and depressive symptoms (PHQ-9). The ANKK1 rs1800497 and rs1799732 DRD2 polymorphisms were genotyped. RESULTS: The median total weight loss (TWL) was 34.7 kg, with a BMI of 33.8 kg/m2, 6 (4-8) years after BS. The TWL was positively associated with the TFEQ-R18 score (p = 0.006) and negatively associated with triglycerides (p = 0.011). rs1800497 ANKK1 was associated with TFEQ-R18 (OR = 1.13 (1.02-1.25), p = 0.009). We also found a negative correlation of pre-surgery BMI with scholarship (r = - 0.27, p < 0.05). CONCLUSION: The patients showed an improvement in metabolic and anthropometric parameters post-surgery. Interestingly, the ANKK1 Taq1A polymorphism was associated with eating behavior and scholarship with pre-surgery BMI, which may be considered predictors of BS outcomes.

Blood Type Associated with the Risk of COVID-19 Infection in Pregnant Women.

COVID-19 forced us to investigate risk factors to provide the best medical attention, especially in vulnerable groups, such as pregnant patients. Studies in other populations have analyzed blood groups in relation to infection, complications, and death. The present study aimed to analyze the association of blood groups with the risk of infection and complications in pregnant women and newborns from the Mexican-Mestizo population. We studied 1906 individuals. Quantitative variables were analyzed through the Student's t-test. Categorical variables were analyzed through Pearson's chi-square test, and logistic regression was used to analyze the association between categorical variables and outcomes. No significant association was observed between blood groups and infection risk. Individuals with the AB blood type are at higher risk for developing severe disease, although blood groups do not seem to be involved in the risk of SARS-CoV-2 infection. However, the AB blood group could be considered a risk factor for developing severe COVID-19 in the Mexican population.

Hand grip strength and early mortality after hip fracture.

This research describes the risk of death in elderly after hip fracture according to their strength, measured by hand grip. The result is that the weaker the patient, the greater the risk of death after hip fracture, highlighting the need to assess the force in those patients. For the coming years, most of hip fractures will occur in developing countries. It has been described that low muscular strength, measured by grip strength, increases the risk of mortality in those with hip fracture, in both high-and low- income countries. The objective of this study was to determine the mortality among patients with hip fracture and lower hand grip strength (HGS). MATERIAL AND METHODS: We conducted a cohort and longitudinal study at Hip and Pelvic Surgery Department of a tertiary hospital, in Monterrey, Mexico. The study included patients aged over of 69, admitted for hip fracture surgery from February 1st 2013 to July 31st 2014. HGS measurement was performed by a trained physician at arrival to emergency department prior to surgery; clinimetric variables were asked, and a complete medical history was included. RESULTS: A total of 670 patients were included in the study and grouped in different tertiles according to hand grip strength. During follow-up, there were 112 deaths (17.4%), 61 (27.5%) in tertile 1, 37 (17.1%) in tertile 2, and 14 (6.8%) in tertile 3, p < 0.001. The association remained significant after adjusting for confounding variables. Less than 5% of patients discharged from hospital were identified with osteoporosis. CONCLUSION: Lower hand grip strength in patients with a hip fracture is associated with high mortality after hip fracture.

Protein Diet in Bariatric Patients Could Modify Tear Film.

Bariatric surgery patients have deficiencies of macro- and micronutrients that may be related to ophthalmic complications, for example consequences on tear film layers (lipid, aqueous, and mucosa). In this work, we associated protein diet and tear film layers in bariatric patients of a Mexican hospital. We measured characteristics of tear film by the Schirmer and tear break up time (TBUT) tests under three different protein percentage diets: 10, 15, and 25%. TBUT values were low in our study, and therefore, bariatric patients may have high possibilities to suffer dry eye or modifications in lipid tear layer. Bariatric patients, additional to the routine control, periodically should have an extensive eye examination.

[Type 2 diabetes mellitus could predict a sub-optimal weight loss after bariatric surgery]. / Diabetes mellitus tipo 2 podría predecir una pérdida subóptima de peso después de una cirugía bariátrica.

INTRODUCTION: bariatric surgery does not benefit all patients. Identifying severely obese patients who will succeed after bariatric surgery remains a challenge for the transdiciplinary team. The objective of this retrospective study was to analyze preoperative dietary factors that could predict a successful weight loss after bariatric surgery. METHODS: the retrospective study included patients undergoing laparoscopic Roux-en-Y gastric bypass surgery as a procedure for severe obesity (n = 84). Patient demographics, comorbidities, dietary factors, and weight loss results were extracted from the electronic medical record. RESULTS: type 2 diabetes mellitus (DM2) was associated with suboptimal weight loss after laparoscopic Roux-en-Y gastric bypass surgery. CONCLUSIONS: although bariatric surgery continues being the most effective treatment for patients with severe obesity, developing strategies to improve and maintain weight loss, especially in patients with DM2, is fundamental. Assessing the dietary characteristics of candidates for bariatric surgery is crucial.

INTRODUCCIÓN: la cirugía bariátrica no beneficia a todos los pacientes. Identificar a los pacientes gravemente obesos que tendrán éxito después de la cirugía bariátrica sigue siendo un reto para el equipo transdiciplinario. El objetivo de este estudio retrospectivo fue analizar factores dietéticos preoperatorios que pudieran predecir una pérdida de peso exitosa después de la cirugía bariátrica. MÉTODOS: el estudio retrospectivo incluyó a pacientes sometidos a una cirugía de bypass gástrico laparoscópico en Y de Roux como procedimiento para obesidad severa (n = 84). Datos demográficos del paciente, comorbilidades, factores dietéticos y los resultados de pérdida de peso se extrajeron de la historia clínica electrónica. RESULTADOS: la diabetes mellitus tipo 2 (DM2) se asoció con una pérdida subóptima de peso después de una cirugía de bypass gástrico laparoscópicoen Y de Roux. CONCLUSIONES: aunque la cirugía bariátrica sigue siendo el tratamiento más efectivo para los pacientes con obesidad severa, es fundamental desarrollar estrategias para mejorar y mantener la pérdida de peso, especialmente en pacientes con DM2. Evaluar las características dietéticas de los candidatos a cirugía bariátrica es crucial.

Diabetes mellitus tipo 2 podría predecir una pérdida subóptima de peso después de una cirugía bariátrica / Type 2 diabetes mellitus could predict a sub-optimal weight loss after bariatric surgery

Introducción: la cirugía bariátrica no beneficia a todos los pacientes. Identificar a los pacientes gravemente obesos que tendrán éxito después de la cirugía bariátrica sigue siendo un reto para el equipo transdiciplinario. El objetivo de este estudio retrospectivo fue analizar factores dietéticos preoperatorios que pudieran predecir una pérdida de peso exitosa después de la cirugía bariátrica. Métodos: el estudio retrospectivo incluyó a pacientes sometidos a una cirugía de bypass gástrico laparoscópico en Y de Roux como procedimiento para obesidad severa (n = 84). Datos demográficos del paciente, comorbilidades, factores dietéticos y los resultados de pérdida de peso se extrajeron de la historia clínica electrónica. Resultados: la diabetes mellitus tipo 2 (DM2) se asoció con una pérdida subóptima de peso después de una cirugía de bypass gástrico laparoscópicoen Y de Roux. Conclusiones: aunque la cirugía bariátrica sigue siendo el tratamiento más efectivo para los pacientes con obesidad severa, es fundamental desarrollar estrategias para mejorar y mantener la pérdida de peso, especialmente en pacientes con DM2. Evaluar las características dietéticas de los candidatos a cirugía bariátrica es crucial

Introduction: bariatric surgery does not benefit all patients. Identifying severely obese patients who will succeed after bariatric surgery remains a challenge for the transdiciplinary team. The objective of this retrospective study was to analyze preoperative dietary factors that could predict a successful weight loss after bariatric surgery. Methods: the retrospective study included patients undergoing laparoscopic Roux-en-Y gastric bypass surgery as a procedure for severe obesity (n = 84). Patient demographics, comorbidities, dietary factors, and weight loss results were extracted from the electronic medical record. Results: type 2 diabetes mellitus (DM2) was associated with suboptimal weight loss after laparoscopic Roux-en-Y gastric bypass surgery. Conclusions: although bariatric surgery continues being the most effective treatment for patients with severe obesity, developing strategies to improve and maintain weight loss, especially in patients with DM2, is fundamental. Assessing the dietary characteristics of candidates for bariatric surgery is crucial

[Protein intake, serum lipids and muscle strenght in the elderly]. / Ingesta de proteína, lípidos séricos y fuerza muscular en ancianos.

INTRODUCTION: The daily protein recommendation for adults is 0.8 g/kg/day; however, several studies argue that an intake of 1.0-1.5 g protein/kg/day could benefit the health of the elderly. OBJECTIVE: We evaluated the protein intake and serum lipid levels in elderly patients with hip fracture, determining their correlation with the grip strength in both hands. METHODS: The study included 47 adult patients aged 65-85 years hospitalized for recent hip fracture. Weight, height, lipid profile and muscle strength of both hands were measured, and MNA was also used to evaluate the nutritional status. RESULTS: The elderly, predominantly women and with a homogeneous age of 80 years on average, were malnourished or at risk of malnutrition in 93% of cases according to the MNA. Men consumed significantly more protein than women. Muscle strength negatively associated with triglyceride levels; 36% of the elderly had triglyceride levels above 150 mg/dl. CONCLUSIONS: TG levels associated inversely with muscle strength in elderly patients with hip fracture. According to these results, which should be validated in other populations, elevated TG levels are a factor of metabolic syndrome and are associated with low muscle strength in the elderly. This is relevant because obesity prevention and metabolic syndrome are one priority through the promotion of healthier lifestyles and nutrition policies that could be widely implemented.

Ingesta de proteína, lípidos séricos y fuerza muscular en ancianos / Protein intake, serum lipids and muscle strenght in the elderly

Introducción: la recomendación diaria de proteína para adultos es de 0,8 g/kg/día. Sin embargo, varios estudios argumentan que una ingesta de 1,0-1,5 g proteína/kg/día podría beneficiar la salud de los ancianos. Objetivo: evaluamos la ingesta de proteína y los niveles de lípidos séricos en ancianos con fractura de cadera determinando su correlación con la fuerza de prensión en ambas manos. Métodos: el estudio incluyó a 47 pacientes adultos de 65-85 años hospitalizados por reciente fractura de cadera. Se midió peso, talla, perfil de lípidos y fuerza muscular de ambas manos, y también se aplicó el Mini Nutritional Assessment (MNA) para evaluar el estado de nutrición. Resultados: de acuerdo al MNA, el 93% de los ancianos estaban malnutridos o en riesgo de malnutrición. Los ancianos eran predominantemente mujeres y con una edad homogénea de 80 años. Los hombres consumieron significativamente más proteína que las mujeres. La fuerza muscular se asoció negativamente con los niveles de triglicéridos (TG) y el 36% de los ancianos tuvieron niveles de triglicéridos superiores a 150 mg/dl. Conclusiones: los niveles de TG se asociaron inversamente con la fuerza muscular en ancianos con fractura de cadera. Estos resultados, que deberán validarse en otras poblaciones, consideran que los niveles elevados de TG son un factor de síndrome metabólico y se asocian a baja fuerza muscular en ancianos, esto es relevante debido a que la prevención de la obesidad y el síndrome metabólico son una prioridad a través de la promoción de estilos de vida más saludables y políticas de alimentación que podrían implementarse ampliamente (AU)

Introduction: The daily protein recommendation for adults is 0.8 g/kg/day; however, several studies argue that an intake of 1.0-1.5 g protein/kg/day could benefit the health of the elderly. Objective: We evaluated the protein intake and serum lipid levels in elderly patients with hip fracture, determining their correlation with the grip strength in both hands. Methods: The study included 47 adult patients aged 65-85 years hospitalized for recent hip fracture. Weight, height, lipid profile and muscle strength of both hands were measured, and MNA was also used to evaluate the nutritional status. Results: The elderly, predominantly women and with a homogeneous age of 80 years on average, were malnourished or at risk of malnutrition in 93% of cases according to the MNA. Men consumed significantly more protein than women. Muscle strength negatively associated with triglyceride levels; 36% of the elderly had triglyceride levels above 150 mg/dl. Conclusions: TG levels associated inversely with muscle strength in elderly patients with hip fracture. According to these results, which should be validated in other populations, elevated TG levels are a factor of metabolic syndrome and are associated with low muscle strength in the elderly. This is relevant because obesity prevention and metabolic syndrome are one priority through the promotion of healthier lifestyles and nutrition policies that could be widely implemented (AU)

[A SIMPLE AND RELIABLE TOOL FOR DETECTION OF NUTRITIONAL RISK IN HOSPITALIZED PATIENTS]. / UN INSTRUMENTO SENCILLO Y FIABLE PARA DETECTAR RIESGO NUTRICIONAL EN PACIENTES HOSPITALIZADOS.

INTRODUCTION: malnutrition in hospital associates with complications such a high rates of infections, increased length of stay, and increased economic costs. Hospitals require applying a simple and reliable tool for detection of nutritional risk. OBJECTIVE: to evaluate the agreement between a screening tool used in a hospital and both MUST and SGA tools to determine the prevalence of nutritional risk. METHODS: patients -with a hospitalization period less than 36 hours- were assessed with three nutritional screening tools. Kappa value was used to assess agreement between the tests; SGA was the gold standard. RESULTS: the study included 100 patients (F = 49, M = 51) with a mean age of 49 years. MUST presented a good agreement with the SGA (kappa = 0.55). CONCLUSIONS: MUST presents the highest agreement with the gold standard; therefore, it must be used to screen nutritional status of hospitalized patients due to its simplicity, reliability, and reproducibility.

Introducción: la desnutrición hospitalaria se asocia con retraso en la curación, mayor tiempo de hospitalización y gasto económico. Los hospitales requieren un instrumento sencillo para detectar un posible riesgo nutricional. Objetivo: evaluar la concordancia entre un formato de tamizaje utilizado en un hospital de tercer nivel y los instrumentos validados MUST y SGA para diagnosticar el riesgo nutricional. Métodos: pacientes con periodo de hospitalización menor a 36 horas fueron valorados con los tres tamizajes nutricionales. Utilizamos valor kappa para medir la concordancia entre las herramientas de tamizaje; el instrumento SGA fue el estándar de oro. Resultados: el estudio incluyó 100 pacientes (F = 49, M = 51) con una edad media de 49 años. MUST presentó buena concordancia con el SGA (kappa = 0,55). Conclusiones: MUST presentó mayor concordancia con el estándar de oro; por lo tanto, el MUST debería utilizarse para el tamizaje nutricional de los pacientes que ingresan en hospitales debido a su sencillez, fiabilidad y reproducibilidad.

Un instrumento sencillo y fiable para detectar riesgo nutricional en pacientes hospitalizados / A simple and reliable tool for detection of nutritional risk in hospitalized patients

Introducción: la desnutrición hospitalaria se asocia con retraso en la curación, mayor tiempo de hospitalización y gasto económico. Los hospitales requieren un instrumento sencillo para detectar un posible riesgo nutricional. Objetivo: evaluar la concordancia entre un formato de tamizaje utilizado en un hospital de tercer nivel y los instrumentos validados MUST y SGA para diagnosticar el riesgo nutricional. Métodos: pacientes con periodo de hospitalización menor a 36 horas fueron valorados con los tres tamizajes nutricionales. Utilizamos valor kappa para medir la concordancia entre las herramientas de tamizaje; el instrumento SGA fue el estándar de oro. Resultados: el estudio incluyó 100 pacientes (F = 49, M = 51) con una edad media de 49 años. MUST presentó buena concordancia con el SGA (kappa= 0,55). Conclusiones: MUST presentó mayor concordancia con el estándar de oro; por lo tanto, el MUST debería utilizarse para el tamizaje nutricional de los pacientes que ingresan en hospitales debido a su sencillez, fiabilidad y reproducibilidad (AU)

Introduction: malnutrition in hospital associates with complications such a high rates of infections, increased length of stay, and increased economic costs. Hospitals require applying a simple and reliable tool for detection of nutritional risk. Objective: to evaluate the agreement between a screening tool used in a hospital and both MUST and SGA tools to determine the prevalence of nutritional risk. Methods: patients -with a hospitalization period less than 36 hours- were assessed with three nutritional screening tools. Kappa value was used to assess agreement between the tests; SGA was the gold standard. Results: the study included 100 patients (F=49, M=51) with a mean age of 49 years. MUST presented a good agreement with the SGA (kappa = 0.55). Conclusions: MUST presents the highest agreement with the gold standard; therefore, it must be used to screen nutritional status of hospitalized patients due to its simplicity, reliability, and reproducibility (AU)

Taste perception in normal and overweight Mexican adults.

The prevalence of obesity in Mexico is the highest in the world, with almost 70% of adults being classified as overweight or obese. The increased prevalence of obesity in Mexico, and globally, may be related to the changing food environment, providing increased access to highly palatable, but obesogenic, food products. One potential mechanism for this association is changing food perceptions, an area poorly studied in transitional countries. Thus, we conducted a study to determine the degree to which perception thresholds for four basic tastes are associated with anthropometric variables, hormone levels, and energy intake. Bitter and sweet taste had the lowest and highest thresholds, respectively, and women reported a greater sensitivity to these flavors compared to men. Overall, the perception thresholds to each flavor were not associated with energy intake or body mass index (BMI), while the perception threshold of aspartame was negatively associated with energy intake. Based on the results of our study, in a sample of Mexican adults, sensory taste response to basic flavors is not associated with energy intake or BMI.

Testing the Protein Leverage Hypothesis in a free-living human population.

The Protein Leverage Hypothesis (PLH) predicts that humans prioritize protein when regulating food intake. We tested a central prediction of PLH: protein intake will remain more constant than fat or carbohydrate in the face of dietary changes in a free-living population. Data come from a large sample of adult Filipino women participating in the Cebu Longitudinal Health and Nutrition Survey (CLHNS) located in Philippines. Longitudinal data analysis showed that, as predicted, calories of dietary protein remained more constant over time than calories of dietary carbohydrates or fat, even if corrected for the low proportional contribution of protein to dietary energy.

Design and testing of foods differing in protein to energy ratios.

Our aim was to design a selection of foods with differing proportions of protein but equal palatability in two settings, Sydney Australia and Kingston Jamaica. The foods were manipulated to contain 10, 15 or 25% E as protein with reciprocal changes in carbohydrate to 60, 55 or 45% E and dietary fat was kept constant at 30%. Naïve participants did not identify a difference in protein between the versions. On average, the versions were rated equal in pleasantness (Sydney-10%: 44±2, 15%: 49±2 and 25%: 49±2 Kingston-10%: 41±3, 15%: 41±3 and 25%: 37±3).

Catch-up growth in infants born small for gestational age--a longitudinal study.

BACKGROUND: Epidemiological studies correlate low birth weight and the subsequent development of diabetes mellitus (DM). Early changes in insulin resistance in infants with catch-up growth (CUG) have not been evaluated in our population. AIM: To identify dietary and metabolic features associated with CUG in infants born small for gestational age (SGA) at 1 year old. METHODS: In a cohort study of 88 term infants (44 SGA and 44 appropriate for gestational age [AGA]), breastfeeding and weaning age were registered. Anthropometric measurements, glucose, insulin, and leptin concentrations were measured at birth and at 1 year old. RESULTS: A history of DM in a second-degree relative (p = 0.01) and complementary breastfeeding (p = 0.0003) were higher in SGA compared to AGA infants. Ten (13.6%) infants showed CUG in length and weight combined. They had lower weight, glucose, IR index, and leptin concentrations at birth than those without CUG. After logistic regression analysis for factors related to weight CUG, gender, weaning age, birth weight and leptin concentration at birth were included in the model (R2 = 0.31; p = 0.00004). CONCLUSIONS: Female gender, early weaning, lower birth weight, and lower leptin concentration at birth are related to weight CUG in Mexican infants.

Body fat at birth and cord blood levels of insulin, adiponectin, leptin, and insulin-like growth factor-I in small-for-gestational-age infants.

BACKGROUND: Low birthweight has been associated with an increased risk of obesity, insulin resistance, and diabetes in adulthood. The aim of this study was to evaluate IGF-I, adiponectin, insulin levels, and body fat in small-for-gestational-age (SGA) infants at birth. METHODS: We performed a transverse comparative study in SGA and appropriate-for-gestational-age (AGA) infants. The study was conducted at the Hospital of Gynecology and Obstetrics in Leon, Mexico. Weight, length, and percent of body fat were evaluated during the first 48 h of birth. Glucose, insulin, leptin, adiponectin, and IGF-I levels in cord blood were measured. RESULTS: We studied 100 infants (50 SGA and 50 AGA). A history of diabetes in a second-degree relative was higher in SGA infants than in AGA infants (48.0 vs. 30.0%, respectively; p = 0.03). Glucose, adiponectin, insulin and IGF-I levels were similar between the groups. Leptin levels and percentage of body fat were lower in SGA than AGA (15.3 vs. 23.4 ng/mL; p = 0.003, 11.1 vs. 12.7%; p <0.001, respectively). Logistic regression analysis showed that length, percentage of body fat, and leptin levels were positively associated with birthweight. However, leptin levels were not independent of percentage of body fat. CONCLUSIONS: Low body fat and leptin levels, but no evidence of increased metabolic risk at birth, were found in SGA infants.