Factors associated with successful dietary changes in an energy-reduced Mediterranean diet intervention: a longitudinal analysis in the PREDIMED-Plus trial.

PURPOSE: Long-term nutrition trials may fail to respond to their original hypotheses if participants do not comply with the intended dietary intervention. We aimed to identify baseline factors associated with successful dietary changes towards an energy-reduced Mediterranean diet (MedDiet) in the PREDIMED-Plus randomized trial. METHODS: Longitudinal analysis of 2985 participants (Spanish overweight/obese older adults with metabolic syndrome) randomized to the active intervention arm of the PREDIMED-Plus trial. Dietary changes were assessed with a 17-item energy-reduced MedDiet questionnaire after 6 and 12 months of follow-up. Successful compliance was defined as dietary changes from baseline of ≥ 5 points for participants with baseline scores < 13 points or any increase if baseline score was ≥ 13 points. We conducted crude and adjusted multivariable logistic regression models to identify baseline factors related to compliance. RESULTS: Consistent factors independently associated with successful dietary change at both 6 and 12 months were high baseline perceived self-efficacy in modifying diet (OR6-month: 1.51, 95% CI 1.25-1.83; OR12-month: 1.66, 95% CI 1.37-2.01), higher baseline fiber intake (OR6-month: 1.62, 95% CI 1.07-2.46; OR12-month: 1.62, 95% CI 1.07-2.45), having > 3 chronic conditions (OR6-month: 0.65, 95% CI 0.53-0.79; OR12-month: 0.76, 95% CI 0.62-0.93), and suffering depression (OR6-month: 0.80, 95% CI 0.64-0.99; OR12-month: 0.71, 95% CI 0.57-0.88). CONCLUSION: Our results suggested that recruitment of individuals with high perceived self-efficacy to dietary change, and those who initially follow diets relatively richer in fiber may lead to greater changes in nutritional recommendations. Participants with multiple chronic conditions, specifically depression, should receive specific tailored interventions. TRIAL REGISTRATION: ISRCTN registry 89898870, 24th July 2014 retrospectively registered http://www.isrctn.com/ISRCTN89898870 .

Bariatric surgery improves metabolic and nonalcoholic fatty liver disease markers in metabolically healthy patients with morbid obesity at 5 years.

BACKGROUND: No studies have evaluated the effect of metabolic and bariatric surgery (MBS) on nonalcoholic fatty liver disease (NAFLD) and cardiometabolic markers in metabolically healthy patients with morbid obesity (MHMO) at midterm. OBJECTIVES: To assess the effect of MBS on NAFLD and cardiometabolic markers in MHMO patients and ascertain whether metabolically unhealthy patients with morbid obesity (MUMO) remain metabolically healthy at 5 years after MBS. SETTING: University hospital. METHODS: A total of 191 patients with a body mass index >40 kg/m2 and at least 5 years of follow-up were retrospectively analyzed. Lost to follow-up were 37.6% (151 of 401 patients). Patients were classified as MHMO if 1 or 0 of the cardiometabolic markers were present using the Wildman criteria. The degree of liver fibrosis was assessed using the NAFLD fibrosis score (NFS). RESULTS: Forty-one patients (21.5%) fulfilled the criteria for MHMO. They showed significant improvements in blood pressure (from 135.1 ± 22.1 and 84.2 ± 14.3 mm Hg to 117.7 ± 19.2 and 73.0 ± 10.9 mm Hg), plasma glucose (from 91.0 ± 5.6 mg/dL to 87.2 ± 5.2 mg/dL), homeostatic model assessment for insulin resistance (from 2.2 ± .9 to 1.0 ± .8), triglycerides (from 88.0 [range, 79.5-103.5] mg/dL to 61.0 [range, 2.0-76.5] mg/dL), alanine aminotransferase, gamma-glutamyl transpeptidase NFS (from -1.0 ± 1.0 to -1.9 ± 1.2), and high-density lipoprotein cholesterol (from 56.9 ± 10.5 mg/dL to 77.9 ± 17.4 mg/dL) at 5 years after surgery. A total of 108 MUMO patients (84.4%) who became metabolically healthy after 1 year stayed healthy at 5 years. CONCLUSIONS: MBS induced a midterm improvement in cardiometabolic and NAFLD markers in MHMO patients. Seventy-six percent of MUMO patients became metabolically healthy at 5 years after MBS.

U-Shaped Association between Dietary Acid Load and Risk of Osteoporotic Fractures in 2 Populations at High Cardiovascular Risk.

BACKGROUND: Bone contributes to maintaining the acid-base balance as a buffering system for blood pH. Diet composition also affects acid-base balance. Several studies have linked an imbalance in the acid-base system to changes in the density and structure of bone mass, although some prospective studies and meta-analyses suggest that acid load has no deleterious effect on bone. OBJECTIVE: The aim of this study was to examine the associations between potential renal acid load (PRAL) and net endogenous acid production (NEAP) and the risk of osteoporotic fractures and bone mineral density (BMD) in 2 middle-aged and elderly Mediterranean populations. METHODS: We conducted a longitudinal analysis including 870 participants from the PREvención con DIeta MEDiterranea (PREDIMED) Study and a cross-sectional analysis including 1134 participants from the PREDIMED-Plus study. Participants were adults, aged 55-80 y, either at high cardiovascular risk (PREDIMED) or overweight/obese with metabolic syndrome (PREDIMED-Plus), as defined by the International Diabetes Federation, the American Heart Association, and the National Heart Association. PRAL and NEAP were calculated from validated food-frequency questionnaires. BMD was measured using DXA scans. Fracture information was obtained from medical records. The association between mean PRAL and NEAP and fracture risk was assessed using multivariable-adjusted Cox models. BMD differences between tertiles of baseline PRAL and NEAP were evaluated by means of ANCOVA. RESULTS: A total 114 new fracture events were documented in the PREDIMED study after a mean of 5.2 y of intervention and 8.9 y of total follow-up. Participants in the first and third PRAL and NEAP tertiles had a higher risk of osteoporotic fracture compared with the second tertile, showing a characteristically U-shaped association [HR (95% CI): 1.73 (1.03, 2.91) in tertile 1 and 1.91 (1.14, 3.19) in tertile 3 for PRAL, and 1.83 (1.08, 3.09) in tertile 1 and 1.87 (1.10, 3.17) in tertile 3 for NEAP]. Compared with the participants in tertile 1, the participants in the top PRAL and NEAP tertiles had lower BMD [PRAL: mean total femur BMD: 1.029 ± 0.007 and 1.007 ± 0.007 g/cm2; P = 0.006 (tertiles 1 and 3); NEAP: mean total femur BMD: 1.032 ± 0.007 and 1.009 ± 0.007 g/cm2; P = 0.017 (tertiles 1 and 3)]. CONCLUSIONS: The results of our study suggest that both high and low dietary acid are associated with a higher risk of osteoporotic fractures, although only high dietary acid was found to have a negative relation to BMD in senior adults with existing chronic health conditions. This trial was registered at http://www.isrctn.com/ as ISRCTN3573963 (PREDIMED) and ISRCTN89898870 (PREDIMED-Plus).

Additional Metabolic Effects of Bariatric Surgery in Patients with a Poor Mid-Term Weight Loss Response: A 5-Year Follow-Up Study.

To ascertain the 5-year metabolic effects of bariatric surgery in poor weight loss (WL) responders and establish associated factors. METHODS: Retrospective analysis of a non-randomised prospective cohort of bariatric surgery patients completing a 5-year follow-up. Mid-term poor WL was considered when 5-year excess weight loss was <50%. RESULTS: Forty-three (20.3%) of the 212 included patients were mid-term poor WL responders. They showed an improvement in all metabolic markers at 2 years, except for total cholesterol. This improvement with respect to baseline was maintained at 5 years for plasma glucose, HbA1c, HOMA, HDL and diastolic blood pressure; however, LDL cholesterol, triglycerides and systolic blood pressure were similar to presurgical values. Comorbidity remission rates were comparable to those obtained in the good WL group except for hypercholesterolaemia (45.8% vs. poor WL, p = 0.005). On multivariate analysis, lower baseline HDL cholesterol levels, advanced age and lower preoperative weight loss were independently associated with poor mid-term WL. CONCLUSIONS: Although that 1 in 5 patients presented suboptimal WL 5 years after bariatric surgery, other important metabolic benefits were maintained.

Correlation of Gastric Volume and Weight Loss 5 Years Following Sleeve Gastrectomy.

INTRODUCTION: The volume of the gastric reservoir (VGR) after sleeve gastrectomy influences weight loss in the short-term, but long-term results are scarce. The aim was to analyze the correlation between the VGR and weight loss at 5 years of follow-up. METHODS: It is a prospective observational study of 50 patients undergoing sleeve gastrectomy (SG) from February 2009 to December 2013. An upper gastrointestinal series was performed at 1 month and at 1 and 5 years after surgery. A composite formula was used for VGR estimation. Weight loss-related data included the following: body mass index (BMI), percentage of excess weight loss (%EWL), and percentage of excess BMI loss (%EBMIL) at 1 month and at 1 and 5 years. Uni- and multivariate analyses were carried out to determine other factors that might influence long-term weight loss results. RESULTS: The %EWL at 1 year was 74.5(63.8-86) vs. 55.5(47-74.3) at 5 years (p < 0.001). The VGR 1 month after surgery was 114.9 (90.5-168.3) mL. The VGR increased from 216.7 (155.1-278.6) to 367.5 (273-560.3) mL (p < 0.001) at 1 and 5 years. Although a significant inverse correlation was observed between VGR and BMI, %EWL, and %EBMIL at 1 year, it disappeared at 5 years. In the multivariate analysis, the main factor to predict worse weight results at 5 years was a pre-surgical BMI ≥ 50 kg/m2. CONCLUSION: The VGR increased progressively during the study period. Although an inverse relationship between VGR and weight was found at 1 year, this correlation did not remain at 5 years. A preoperative BMI ≥ 50 kg/m2 is the main predictive factor of poor weight outcomes.

Most of qualitative dietary changes observed one year post-bariatric surgery can be achieved with a preoperative dietary intervention.

BACKGROUND AND OBJECTIVES: Bariatric surgery (BS) leads to several changes in nutritional habits that can be attributed to different mechanisms. Some of these changes could be achievable with a preoperative nutritional intervention. The objective was to evaluate dietary modifications during the preoperative and postoperative periods of BS. METHODS: Prospective observational study of patients who underwent BS between 2010 and 2014 at the Hospital del Mar; 60 consecutive patients were included. Food consumption was measured by a validated food-frequency questionnaire at inclusion in the bariatric surgery program, after preoperative nutritional intervention, and one year after surgery. Generalized estimating equation models were used to assess differences in food group intake during follow up. RESULTS: Energy intake significantly decreased from inclusion to 1 year of surgery (p=0.003). After the preoperative intervention and prior to surgery, there was an increase in intake of nuts, vegetables, poultry and rabbit, fruit, fish and skimmed milk products and a decrease in bread, soft drinks and pastry. At one year post-surgery, a continued decrease in the consumption of bread and soft drinks and an increase in nuts was observed (linear non-quadratic trend). Consumption of fruit, pastry, fish and skimmed milk products remained stable showing a linear and quadratic trend. Vegetables and poultry and rabbit increased in the preoperative period and decreased after surgery, showing a quadratic but not linear trend. CONCLUSIONS: a preoperative nutritional intervention in morbidly obese patients can associate favorable dietary changes that are mostly maintained one year after bariatric surgery.

Long Daytime Napping Is Associated with Increased Adiposity and Type 2 Diabetes in an Elderly Population with Metabolic Syndrome.

Research examining associations between objectively-measured napping time and type 2 diabetes (T2D) is lacking. This study aimed to evaluate daytime napping in relation to T2D and adiposity measures in elderly individuals from the Mediterranean region. A cross-sectional analysis of baseline data from 2190 elderly participants with overweight/obesity and metabolic syndrome, in the PREDIMED-Plus trial, was carried out. Accelerometer-derived napping was measured. Prevalence ratios (PR) and 95% confidence intervals (CI) for T2D were obtained using multivariable-adjusted Cox regression with constant time. Linear regression models were fitted to examine associations of napping with body mass index (BMI) and waist circumference (WC). Participants napping ≥90 min had a higher prevalence of T2D (PR 1.37 (1.06, 1.78)) compared with those napping 5 to <30 min per day. Significant positive associations with BMI and WC were found in those participants napping ≥30 min as compared to those napping 5 to <30 min per day. The findings of this study suggest that longer daytime napping is associated with higher T2D prevalence and greater adiposity measures in an elderly Spanish population at high cardiovascular risk.

Recommendations for the detection, diagnosis and follow-up of patients with non-alcoholic fatty liver disease in primary and hospital care. / Recomendaciones para la detección, diagnóstico y seguimiento de los pacientes con enfermedad por hígado graso no alcohólico en atención primaria y hospitalaria.

Non-alcoholic fatty liver disease (NAFLD) is one of the most common chronic liver diseases, with a prevalence of 20-30% in the general population and 60-80% in at-risk populations. In a not negligible percentage of patients, NAFLD progresses from steatosis to different stages of fibrosis and cirrhosis. Due to its high prevalence, NAFLD has become a significant health problem that requires specific action in detection, diagnosis, follow-up and treatment. Furthermore, given that NAFLD presents an increased risk of cardiovascular morbidity and mortality, a multidisciplinary approach is required for its treatment and follow-up. Patients with early stages of the disease, without fibrosis, can be diagnosed and receive treatment in the Primary Care setting, while those with more advanced liver disease benefit from specialised follow-up in the hospital setting to prevent and treat liver complications. This consensus document, prepared by the Catalan Societies of Digestology, Primary Care, Endocrinology, Diabetes and Internal Medicine, arises from the need to design strategies to guide patient flows between Primary and Hospital Care in order to offer patients with NAFLD the best care according to the stage of their disease. The consensus document describes the most commonly used non-invasive diagnostic methods for patient diagnosis and two algorithms have been designed for patient management in both Primary Care and Hospital Care.

Changes in Thyroid Replacement Therapy after Bariatric Surgery: Differences between Laparoscopic Roux-en-Y Gastric Bypass and Laparoscopic Sleeve Gastrectomy.

INTRODUCTION: Levothyroxine (LT4) requirements can presumably be modified differently after laparoscopic Roux-en-Y gastric bypass (LRYGB) and laparoscopic sleeve gastrectomy (LSG). The present study compared changes in LT4 dose in hypothyroid subjects undergoing LRYGB or LSG 2 years after the procedure. MATERIAL AND METHODS: A 2-year follow-up observational study was conducted in a prospective cohort of obese patients who had undergone bariatric surgery and were receiving LT4. Indication for the type of surgical procedure was based on clinical criteria. Repeated measures ANOVA models were used to examine differences within and between groups. RESULTS: Thirty-five consecutive patients were included for analysis: 22 LRYGB and 13 LSG. Total daily LT4 dosage decreased in the LSG group (133.7 ± 50.3 mcg/day at baseline to 104.3 ± 43.3 mcg/day at 2 years; p = 0.047) whereas it remained stable in the LRYGB group (129.5 ± 46.1 mcg/day at baseline to 125.2 ± 55.7 mcg/day at 2 years; p = 1.000). Differences between groups became significant at 24 months. Daily weight-based LT4 dose increased in the LRYGB group (1.11 ± 0.38 mcg/kg day at baseline to 1.57 ± 0.74 mcg/kg day at 2 years; p = 0.005) with no significant changes in the LSG group (1.15 ± 0.35 mcg/kg day at baseline vs 1.11 ± 0.49 mcg/kg day at 2 years; p = 1.000). CONCLUSION: LRYGB and LSG showed different changes in LT4 requirements 2 years after surgery. There was an early decrease in daily total LT4 dose requirements after LSG, which suggests an early preventive reduction to be validated in future studies.

Characterization of the pattern of food consumption in severely obese patients prior to bariatric surgery.

INTRODUCTION: Introduction: severe obesity is increasing rapidly in several countries, as well as the number of bariatric surgeries performed. However, the pattern of food consumption of the population is not well defined. Objectives: the aim of the present study was to describe the food consumption pattern (comparing men and women) of severely obese patient candidates to bariatric surgery and to determine the promoting and protecting factors. Methods: food consumption and nutrient intake were measured by a validated food frequency questionnaire (FFQ), including food and beverages. Multivariate principal component analysis (PCA) was done to analyze the component that best relates to the food pattern consumption dividing the different food groups in promotors and protectors. Results: significant differences in the food consumption pattern of men and women with severe obesity addressed for bariatric surgery were found. A positive correlation was found between the food groups that are protective factors for obesity such as the fiber (r = 0.84), vegetables (r = 0.767) and fruits (r = 0.83), whereas a negative correlation was found with those factors that are promotors of obesity such as fats (r = -0.341), saturated fats (r = -0.411), soft drinks (r = -0.386), and fast food (r = -0.17).Multivariate analysis of principal components revealed that calorie consumption is the component that correlates better with the pattern. Conclusions: there are significant differences in the food consumption pattern of men and women with severe obesity addressed for bariatric surgery and these differences should be taken into account when planning nutritional intervention. Therefore, a healthy lifestyle behaviour should be highly encouraged among the severe obese population.

INTRODUCCIÓN: Introducción: la obesidad mórbida así como el número de cirugías bariátricas que se practican van en aumento en varios países. Sin embargo, el patrón de consumo alimentario de estos pacientes no está bien definido. Objetivos: describir el patrón de consumo de alimentos (comparando hombres y mujeres) de pacientes con obesidad severa candidatos a cirugía bariátrica y determinar los factores promotores y protectores de la obesidad. Métodos: el consumo de alimentos y la ingesta de nutrientes se midieron mediante un cuestionario de frecuencia de consumo de alimentos validado que incluye alimentos y bebidas. Se realizó un análisis multivariado de componentes principales para determinar qué componente se relaciona mejor con el consumo de patrones alimentarios promotores y protectores de obesidad. Resultados: el estudio mostró diferencias significativas en el patrón de consumo de alimentos entre hombres y mujeres. Se encontró una correlación positiva entre los grupos de alimentos considerados factores de protección para la obesidad, como la fibra (r = 0,84), las verduras (r = 0,767) y las frutas (r = 0,83), mientras que la correla-ción fue negativa con los factores promotores de la obesidad como las grasas (r = -0,341), las grasas saturadas (r = -0,411), los refrescos (r = -0,386) y la comida rápida (r = -0,17). El análisis multivariado de los componentes principales reveló que el consumo de calorías es el componente que se correlaciona mejor con el patrón. Conclusiones: existen diferencias significativas en el patrón de consumo de alimentos entre hombres y mujeres con obesidad severa y estas deben tenerse en cuenta al planificar la intervención nutricional. Asimismo, un consumo alimentario saludable debe promocionarse en la población obesa.

Trends in prevalence of gestational diabetes and perinatal outcomes in Catalonia, Spain, 2006 to 2015: the Diagestcat Study.

BACKGROUND: No recent epidemiologic studies on gestational diabetes mellitus (GDM) have been conducted in Spain. The present study aimed to explore trends in the prevalence of GDM and ascertain whether the risk of adverse perinatal outcomes changed between 2006 and 2015 in Catalonia. METHODS: In this population-based study, all hospital admissions for singleton births in Catalonia for the period 2006 to 2015 were collected from the Spanish Minimum Basic Data Set. Cases of GDM were identified from hospital delivery discharge reports using ICD-9-CM codes. Data regarding maternal characteristics and perinatal outcomes were analysed. Crude and age-adjusted annual prevalences were calculated. The Poisson regression model was used to assess trends in prevalence and perinatal outcomes, adjusted for age and smoking habit; however, they could not be adjusted for body mass index (BMI) and ethnicity. RESULTS: Data from 743 762 deliveries were collected. GDM prevalence over the study period was 4.80% (95% CI 4.75-4.85%). Crude GDM prevalence rose from 3.81% (95% CI 3.67-3.95%) in 2006 to 6.53% (95% CI 6.33-6.72%) in 2015 (P < 0.001). Women with GDM showed a stable trend in rates of preeclampsia (2.56%), prematurity (15.7%), and large-for-gestational age (LGA) newborns (18.3%), whereas a lower rate of macrosomia was observed during the study period (from 9.16% to 7.84%). Caesarean deliveries rose from 28% to 31%; however, significance was lost after adjustment. CONCLUSIONS: The prevalence of GDM in Catalonia almost doubled between 2006 and 2015. During the study period, the frequency of macrosomia decreased whereas pre-eclampsia, prematurity, LGA, and age-adjusted Caesarean rates remained stable.

Excess Weight in Spain: Current Situation, Projections for 2030, and Estimated Direct Extra Cost for the Spanish Health System.

INTRODUCTION AND OBJECTIVES: Excess weight promotes the development of several chronic diseases and decreases quality of life. Its prevalence is increasing globally. Our aim was to estimate the trend in excess weight between 1987 and 2014 in Spanish adults, calculate cases of excess weight and its direct extra costs in 2006 and 2016, and project its trend to 2030. METHODS: We selected 47 articles in a systematic literature search to determine the progression of the prevalence of overweight, nonmorbid obesity, and morbid obesity and average body mass index between 1987 and 2014. We projected the expected number of cases in 2006, 2016, and 2030 and the associated direct extra medical costs. RESULTS: Between 1987 and 2014, the prevalence of overweight, obesity, and morbid obesity increased by 0.28%/y (P=.004), 0.50%/y (P <.001) and 0.030%/y (P=.006) in men, and by 0.10%/y (P=.123), 0.25%/y (P=.078), and 0.042%/y (P=.251) in women. The mean body mass index increased by 0.10 kg/m2/y in men (P <.001) and 0.26 kg/m2/y in women (significantly only between 1987 and 2002, P <.001). We estimated 23 500 000 patients with excess weight in 2016, generating 1.95 billion €/y in direct extra medical costs. If the current trend continues, between 2016 and 2030, there will be 3 100 000 new cases of excess weight, leading to 3.0 billion €/y of direct extra medical costs in 2030. CONCLUSIONS: Excess weight in Spanish adults has risen since the creation of population registries, generating direct extra medical costs that represent 2% of the 2016 health budget. If this trend continues, we expect 16% more cases in 2030 and 58% more direct extra medical costs.

Can Helicobacter pylori Eradication Treatment Modify the Metabolic Response to Bariatric Surgery?

BACKGROUND: Helicobacter pylori (HP) colonization is common in severely obese patients undergoing bariatric surgery. HP eradication treatment could influence the evolution of weight loss and metabolic markers after bariatric surgery. OBJECTIVE: To assess the influence of HP eradication in the clinical course of morbid obesity patients treated with bariatric surgery (gastric bypass (LRYGB) and sleeve gastrectomy (LSG)) METHODS: Retrospective analysis of a prospective cohort of 229 patients that underwent bariatric surgery between 2010 and 2013 in Hospital del Mar. HP infection was tested preoperatively by gastric biopsy and, if positive, treated with omeprazole, clarithromycin, and amoxicillin for 14 days. Patients were followed at 3, 6, 12, 18, and 24 months after bariatric surgery. Short-term weight loss and metabolic outcomes were evaluated. RESULTS: HP treated (HPt) patients had a greater reduction in BMI at 3 months after LSG (ΔBMI (kg/cm2) 8.5 ± 4.1 vs 11.3 ± 3.05 kg/m2; p = 0.004) and a reduction in the evolution of triglyceride levels from baseline to 12 months (p = 0.014) compared to HP-negative (HP-) subjects. Also, non-diabetic HPt patients had a greater reduction in glucose levels at all time points that was maintained up to 24 months after LRYGB (p = 0.003). No differences were observed in total and LDL cholesterol levels, HOMA-IR, or HbA1C. CONCLUSIONS: Preoperative HP eradication has a short-term influence on some metabolic parameters after bariatric surgery.

The Mediterranean Diet decreases LDL atherogenicity in high cardiovascular risk individuals: a randomized controlled trial.

SCOPE: Traditional Mediterranean diet (TMD) protects against cardiovascular disease through several mechanisms such as decreasing LDL cholesterol levels. However, evidence regarding TMD effects on LDL atherogenic traits (resistance against oxidation, size, composition, cytotoxicity) is scarce. METHODS AND RESULTS: We assessed the effects of a 1-year intervention with a TMD on LDL atherogenic traits in a random sub-sample of individuals from the PREDIMED study (N = 210). We compared two TMDs: one enriched with virgin olive oil (TMD-VOO, N = 71) and another with nuts (TMD-Nuts, N = 68), versus a low-fat control diet (N = 71). After the TMD-VOO intervention, LDL resistance against oxidation increased (+6.46%, p = 0.007), the degree of LDL oxidative modifications decreased (-36.3%, p<0.05), estimated LDL particle size augmented (+3.06%, p = 0.021), and LDL particles became cholesterol-rich (+2.41% p = 0.013) relative to the low-fat control diet. LDL lipoproteins became less cytotoxic for macrophages only relative to baseline (-13.4%, p = 0.019). No significant effects of the TMD-Nuts intervention on LDL traits were observed versus the control diet. CONCLUSION: Adherence to a TMD, particularly when enriched with virgin olive oil, decreased LDL atherogenicity in high cardiovascular risk individuals. The development of less atherogenic LDLs could contribute to explaining some of the cardioprotective benefits of this dietary pattern.

Preoperative predictors of weight loss at 4 years following bariatric surgery.

BACKGROUND: This study evaluated the influence of patient characteristics, preoperative weight loss, and type of surgical procedure on long-term weight loss after bariatric surgery (BS). METHODS: Subjects were a prospective cohort of 95 patients who underwent BS with 4 years of follow-up. Seventy-seven patients (81.1%) underwent laparoscopic Roux-en-Y gastric bypass, and 18 (18.9%) had laparoscopic sleeve gastrectomy. Age, gender, initial body mass index (BMI), preoperative percentage of excess weight loss, presence of type 2 diabetes mellitus, current smoking status, and surgical technique were analyzed via multivariate linear regression analysis to identify predictors of weight loss during the 4 years after the surgery. RESULTS: Maximum percentage of excess weight loss was obtained at 18 months. Age and preoperative BMI were negatively associated with percentage of excess weight loss at 1, 2, 3, and 4 years after BS (P < .005). At 4 years, laparoscopic Roux-en-Y gastric bypass was independently associated with a higher weight loss than laparoscopic sleeve gastrectomy (P < .05). CONCLUSIONS: Younger age, lower BMI, and laparoscopic Roux-en-Y gastric bypass are independent predictors of long-term weight loss after BS.

Can bariatric surgery improve cardiovascular risk factors in the metabolically healthy but morbidly obese patient?

BACKGROUND: Bariatric surgery has been shown to be effective in resolving co-morbid conditions even in patients with a body mass index (BMI)<35 kg/m(2). A question arises regarding the metabolic benefits of bariatric surgery in metabolically healthy but morbidly obese (MHMO) patients, characterized by a low cardiometabolic risk. The objective of this study was to assess the effects of bariatric surgery on cardiometabolic risk factors among MHMO and metabolically unhealthy morbidly obese (MUMO) adults. METHODS: A nonrandomized, prospective cohort study was conducted on 222 severely obese patients (BMI>40 kg/m(2)) undergoing either laparoscopic roux-en-Y gastric bypass or laparoscopic sleeve gastrectomy. Patients were classified as MHMO if only 1 or no cardiometabolic factors were present: high blood pressure, triglycerides, blood glucose (or use of medication for any of these conditions), decreased high-density lipoprotein-cholesterol (HDL-C) levels, and insulin resistance defined as homeostasis model assessment for insulin-resistance (HOMA-IR)> 3.29. RESULTS: Forty-two (18.9%) patients fulfilled the criteria for MHMO. They were younger and more frequently female than MUMO patients. No differences between groups were observed for weight, BMI, waist and hip circumference, total and LDL-C. MHMO patients showed a significant decrease in blood pressure, plasma glucose, HOMA-IR, total cholesterol, LDL-C and triglycerides and an increase in HDL-C 1 year after bariatric surgery. Weight loss 1 year after bariatric surgery was similar in both groups. CONCLUSION: Eighteen percent of patients with morbid obesity fulfilled the criteria for MHMO. Although cardiovascular risk factors in these patients were within normal range, an improvement in all these factors was observed 1 year after bariatric surgery. Thus, from a metabolic point of view, MHMO patients benefited from bariatric surgery.

Ambient temperature and prevalence of obesity in the Spanish population: The Di@bet.es study.

OBJECTIVE: The aim of this study was to examine possible associations between ambient temperature and obesity in the Spanish population using an ecological focus. METHODS: The Di@bet.es study is a national, cross-sectional, population-based survey of cardiometabolic risk factors and their association with lifestyle. SAMPLE: 5,061 subjects in 100 clusters. VARIABLES: Clinical, demographic and lifestyle survey, physical examination, and blood sampling. The mean annual temperature (°C) for each study site was collected from the Spanish National Meteorology Agency (1971-2000). RESULTS: The prevalence rates of obesity in the different geographical areas divided according to mean annual temperature quartiles were 26.9% in quartile 1 (10.4-14.5°C), 30.5% in quartile 2 (14.5-15.5°C), 32% in quartile 3 (15.5-17.8°C), and 33.6% in quartile 4 (17.8-21.3°C) (P = 0.003). Logistic regression analyses including multiple socio-demographic (age, gender, educational level, marital status) and lifestyle (physical activity, Mediterranean diet score, smoking) variables showed that, as compared with quartile 1, the odd ratios for obesity were 1.20 (1.01-1.42), 1.35 (1.12-1.61), and 1.38 (1.14-1.67) in quartiles 2, 3, and 4, respectively (P = 0.001 for difference, P < 0.001 for trend). CONCLUSIONS: Our study reports an association between ambient temperature and obesity in the Spanish population controlled for known confounders.

Modifications of the homeostasis model assessment of insulin resistance index with age.

The aim of the study was to analyze the association between aging and insulin resistance estimated by the homeostasis model assessment of insulin resistance (HOMA-IR). This work involved two studies: (1) the Di@bet.es study is a cross-sectional study including 4,948 subjects, comprising a representative sample of the adult Spanish population; (2) the Pizarra study is a population-based cohort study undertaken in Pizarra (Spain), in which 1,051 subjects were evaluated at baseline and 714 completed the 6-year follow-up study. Study variables included a clinical and demographic structured survey, a lifestyle survey, a physical examination, and an oral glucose tolerance test in subjects without diabetes. In the Di@bet.es study overall, an increase occurred in blood glucose until the age of 50, after which it remained stable (data adjusted for gender, body mass index, abnormal glucose regulation [AGR]). The HOMA-IR increased significantly with age (p = 0.01), due to a higher prevalence of obesity (p < 0.0001) and AGR (p < 0.001). In non-obese subjects without AGR, HOMA-IR values were not modified with age (p = 0.30), but they were with body mass index (p < 0.001). In the Pizarra study, the HOMA-IR was significantly lower after 6-year follow-up in the whole study population. Subjects with a HOMA-IR level higher than the 75th percentile at baseline were more likely to develop diabetes (OR 2.2, 95 % CI 1.2-3.9; p = 0.007) than subjects with a lower HOMA-IR. We concluded that age per se did not increase HOMA-IR levels, changes that might be related to higher rates of obesity and AGR in older subjects. The HOMA-IR was associated with an increased risk of developing type 2 diabetes 6 years later.

Lack of adherence to follow-up visits after bariatric surgery: reasons and outcome.

BACKGROUND: A substantial number of patients undergoing bariatric surgery are lost to follow-up for unknown reasons, which may cause an overestimation of the benefits of operation. The aim of this study was to identify the reasons of failure to attend controls after bariatric surgery and the relationship with poor weight loss. METHODS: A retrospective analysis of a prospective database including all patients undergoing bariatric surgery from January 2004 to February 2012 was performed. Nonadherence was defined as missing any scheduled control visit for more than 6 months. Contact was attempted (mail, telephone, and e-mail), and responders were requested to complete a questionnaire. RESULTS: Forty-six (17.5%) out of 263 patients were considered nonadherent. Thirty-three (71.7%) of these patients completed the questionnaire. The main reasons for nonadherence were work- (36.4%) and family-related (18.2%) problems or having moved outside the city or to the country (15.2%). The percentage of nonadherent patients aged ≤45 years was greater as compared with those aged >45 years [28 (60.1%) vs 18 (42.2%), respectively, P = 0.034]. Likewise, of the 30 patients with unsuccessful weight loss (<50% EWL), seven (30.4%) were in the nonadherent group while 23 (10.6%) in the adherent group (P = 0.046). Finally, 96.9% of patients were completely satisfied with surgery and would recommend the procedure to other morbid obese patients. CONCLUSION: The nonadherence rate to follow-up visits after bariatric surgery was 17.5%, mainly associated with work-related problems. Nonadherence was greater in patients aged ≤45 years and in those with poor weight loss.