Active clinical trials for "Obesity"

No studies have been done to examine whether patients with obstructive lung disease and obesity are more comfortable on some ventilator settings than on others. The purpose of the current study is to examine this question systematically.

Our previous studies have demonstrated that there is substantial metabolic opposition to the maintenance of an altered body weight. Leptin is a protein secreted by fat cells and the circulating concentrations of leptin are directly proportional to fat mass. Leptin-deficiency is associated with severe obesity in rodents and in humans and the obesity is relieved by leptin administration. These studies examine the hypothesis that some of this metabolic opposition cto the maintenance of an altered body weight can be relieved by restoring circulating concentrations of the hormone leptin to the same range as at usual body weight in subjects who are maintaining a reduced body weight. The basic design of this study is to observe subjects at a 10% reduced body weight and then again at that reduced body weight while receiving physiological leptin or T3 supplementation.

One-third of American children are overweight or obese, leading to an increased risk for cardiovascular disease (CVD), early mortality, and other risks throughout their lifespan relative to normal weight children. In our pilot work, we found that 67-83% of parents underestimate a child's long-term risk of developing cardiovascular disease in adulthood and that parents thought their own child's risks were 13-15% lower than those of a typical child in their community, even controlling for family health and demographic characteristics. Parents were 40 times less likely to predict that their child, rather than a typical child in their community, would be overweight or obese in adulthood. These findings suggest that parents suffer from optimism bias, the tendency to overestimate one's chances of experiencing unlikely positive events. Belief that a child is at increased risk for adverse health outcomes in adulthood could be an important motivator for a family to initiate behavior changes and vice versa. The overall goal of this research is to develop provider-based risk communication approaches to motivate parents of obese children to engage in behavior change to protect their children from CVD and other obesity-related co-morbidities later in life. Specifically, the investigators will: Develop risk communication methods that providers can use to better convey accurate information about a child's health behaviors, obesity status, and future health risks to parents. Using an online experiment, we will evaluate the impact of new risk communication methods on parental engagement in behavior change. Pilot test the feasibility, acceptability, and impact of new risk communication approaches in pediatric primary care clinics. This work will give pediatricians novel tools to effectively discuss the long-term consequences of childhood obesity with parents. The findings from this work will inform an interventional trial that will assess the impact of improved risk communication techniques on child behavior change and health outcomes.

Recent studies indicate that obese teenagers exhibit memory disturbances. Adolescence represents a crucial period in the development of the hippocampus and the amygdala, necessary for the implementation of memory and emotional functions for the rest of life. Disturbances of the interaction between amygdala and hippocampus during adolescence have been associated with the development of neuropsychiatric disorders. However, the impact of juvenile obesity on functional amygdala-hippocampus connectivity has not been evaluated yet. The main objective of this study is to compare the emotional memory performance and the level of functional connectivity between the hippocampus and the amygdala during the realization of an emotional associative memory task, in obese and control adolescents.

This study aims to evaluate the effects of oral glycine supplementation on plasma glycine concentration, intracellular glutathione (GSH) concentration, plasma acylglycine concentration, urine acylglycine concentration, and insulin resistance in subjects with morbid obesity. This is an open-labelled trial. 20 adults with morbid obesity will be recruited. Following screening and baseline metabolic evaluations, eligible subjects will be given oral glycine supplements for 14 ± 5 days. Upon completing glycine supplementation, subjects will return for their post-supplement metabolic assessment. The investigators hypothesize that oral glycine supplementation in morbidly obese patients normalizes plasma glycine concentration, increases intracellular GSH concentration, increases plasma and urinary acylglycine concentration, and improves insulin resistance.

Obesity is a complex disease associate to metabolic alterations, which may lead to cardiometabolic risk in women with obesity. The use of interactive digital technology as adjuvante tool to the clinical practices in weight loss therapy emerges as an innovative strategy. However, it was note fully investigated if this kind of approach can contribute to improve inflammatory state and metabolic alterations in obese population.

The main aim of the study is to collect preliminary information on the feasibility and efficacy of a time restricted eating intervention in Spanish children and adolescents with obesity and metabolic comorbidities. Two 8-week interventions will performed in a randomized crossover controlled design: a) reduction of the habitual eating window; b) standard care. Different measurements of body composition and cardiometabolic health markers will be performed along those weeks.

Obesity promotes chronic kidney disease and is accelerating its shift to the stage of renal replacement. Bariatric surgery is a treatment for severe or morbid obesity whose renal benefit is currently unknown. The glomerular filtration rate (GFR) is the best parameter to define the kidney function. It can be estimated using formulas by assaying endogenous markers (creatinine, cystatin C) or measured with an exogenous tracer glomerular filtration (51 Cr-EDTA). Bariatric surgery alters the production of endogenous markers and the extracellular volume (VEC) with 2 important consequences on the assessment of GFR: the formula to estimate GFR is not possible to compare renal function before and after surgery because of the variation in production of endogenous glomerular filtration markers in the same subject; decreasing VEC predicted decreased GFR after surgery, since these parameters are in part proportional to each other. Our working hypothesis is that bariatric surgery protects the kidneys of patients with chronic kidney disease. To demonstrate this, investigators propose to compare the ratio DFG / VEC before and after gastric bypass. Goals The main objective is to measure the effect of gastric bypass on the report DFG / VEC. Secondary objectives are to assess the effect of gastric bypass on the albumin / urine creatinine and evaluate the performance of the main GFR estimating formulas in people with severe or morbid obesity.

To study the kinetics of release after bariatric surgery of selected polluants stored in adipose tissue, looking for clinical and/or predictive factors To test the hypothesis of a deleterious effect of this release on the expected improvement of insulin-resistance and on the liver inflammation. To determine the level of contamination of morbidly obese patients, with or without metabolic syndrome, compared to a control, non obese population, with special attention to clinical (age, gender, reproductive history, pregnancy, nursing) and biological parameters (insulin-resistance, inflammation).

Obesity results from complex interactions between genetic and environmental factors, and are strongly associated with metabolic complications such as type 2 diabetes mellitus. Obesity is defined as an excessive fat accumulation that presents a risk to health, a risk that is highly dependent upon the type of adipose tissue accumulation, whether visceral or sub-cutaneous, but also upon the characteristics of the fat tissue, especially inflammatory cells accumulation. Because of the well known sexual difference in fat accretion, this obesity-associated risk may also be very different for men and for women. In addition, recent data indicate that various factors such as the intestinal microbiota, but also the dietary intake of protective nutrients might be important determinants of the metabolic complications of obesity. Here we propose to: 1) study the metabolic adaptations and the mechanisms of adipose tissue accumulation during a period of controlled caloric over-nutrition, both in men and in women; 2) evaluate the potential protective effects of a supplementation with polyphenols on insulin resistance and other metabolic adaptations.