Active clinical trials for "Obesity"

To determine the effect of weight on doxorubicin and cyclophosphamide plasma clearance in participants who are normal weight (body mass index [BMI] < 25 kg/m2, overweight or class I obese (BMI 25-34.9 kg/m2), or class II-III obese (BMI ≥ 35 kg/m2). The hypothesis is that participants who weigh more will have higher doxorubicin and cyclophosphamide clearances than participants who weigh less. Restated, the area under the drug-concentration time profile, also known as the AUC, in participants will decrease as participant weight increases.

The purpose of this study is to investigate the effect os resistance training on microvascular reactivity, endothelial functions, inflammatory markers, blood pressure, heart rate, body composition and physical fitness in obese adolescents.

Up till now, the evaluation of the endocannabinoid system (ECS) in humans needs invasive procedures. The investigators managed in the lab to determine the levels of endocannabinoids in a small number of subjects. The aim of the study is to confirm that salivary is a useful tool to evaluate the activity of the ECS both in normal weight and obese subjects that are characterised by a hyperactivity of the system. Therefore, the first objective of the study is to compare the fasting level of salivary anandamide between 12 obese patients and 12 normal weight subjects.

Background: - One area in which obese and lean individuals may be different is how their bodies handle water balance and thirst. Studies done in animals suggest that individuals with greater body fat may tolerate periods without water better than lean animals. Other research has found a link between the ability to tolerate periods without water and increased body weight. Researchers are interested in studying whether the ability to tolerate periods without water and ability to feel thirst might differ in lean versus obese individuals. Objectives: - To evaluate the effects of water deprivation and feelings of thirst in lean and obese individuals. Eligibility: - Healthy individuals at least 18 years of age who are either lean (body mass index less than 26 kg/m(2)) or obese (body mass index at least 35 kg/m(2)). Design: Participants will be screened with a medical history, physical examination, and blood and urine tests. Participants will spend the entire study (13 days) as inpatients at the National Institutes of Health Clinical Center. Participants will have the following tests and procedures: Body composition assessment (using low-level x-rays) to determine the percentage of fat tissue in the body. Oral glucose tolerance test (similar to that often used to diagnose diabetes). Individuals who are suspected to have diabetes will not be allowed to continue with the study. High salt infusion test, in which an infusion of saline (salt water) will be given for 2 hours and participants will respond to questions about how hungry and thirsty they feel during the procedure. Water deprivation test, in which participants will go for 24 hours without water or food and respond to questions about how hungry and thirsty they feel. 24-hour stay in a metabolic chamber to determine how many calories participants burn in a day. A series of questionnaires about participants' eating habits, feelings about food, and personal feelings, as well as computer-based tests involving the performance of various tasks. Measurement of free-living energy using doubly-labeled water, in which participants will drink a sample of water with extra-heavy atoms of hydrogen and oxygen to evaluate the amount of water in the body. 24-hour urine collection. Frequent blood samples, urine collection, and fat tissue biopsies during the various study procedures. After the end of the 13-day study, participants will return after 1 week for a final urine collection.

The aim of this study is to investigate potential metabolic effects of resveratrol in men with metabolic syndrome(otherwise healthy). The investigators hypothesize that resveratrol has an anti-inflammatory effect, and will increase insulin sensitivity, change the fat- and sugar-metabolism, and down-regulate bone-turnover.

The purpose of this study is to evaluate the PK properties, tolerability, and safety of lorcaserin HCL (BELVIQ) in obese adolescent subjects between the ages of 12 to 17 years old

Several sugar-replacement sweeteners are currently on the market, including saccharine (ex. Sweet'N Low), aspartame (ex. Equal), and sucralose (ex. Splenda). The purpose of this study is to examine wether non caloric sweeteners affects how well the body works to control blood sugar. The study includes detailed blood sugar testing after drinking liquids that may contain sucralose. The investigators hypothesize that drinking liquids with sucralose will effect the amounts of specific appetite-affecting substances naturally produced by the body.

To test the strength and physical performance outcomes of a 12-week progressive resistance training (PRT) exercise program in a small cohort of patients with Class III obesity who are preparing for bariatric weight loss surgery at Beth Israel Deaconess. The study will also test patient compliance to the 12 week PRT program. Whereas PRT exercise is currently recommended as a part of preoperative clinical care for bariatric surgery patients, little research has been done to measure the acceptance and effectiveness of a standardized PRT exercise protocol for improving health and perioperative care. Preliminary data from this study could be used to justify larger studies and further investigation.

In this study we will examine if the insulin-induced microvascular effects will occur after a physiological stimulus (i.e. a oral glucose tolerance test). With that the physiological importance of the insulin-induced microvascular dilatation can be elucidated. In this study we hypothesize that oral glucose intake and consequently the endogenous induced hyperinsulinemia will lead to insulin-induced microvascular dilatation in healthy normotensive subjects. Furthermore, we suggest that the insulin-mediated microvascular dilatation, resulting from this physiological induced hyperinsulinemia, will be less in hypertensive and obese subjects compared to healthy controls.

This pilot study is a randomized controlled trial with an embedded cross sectional study exploring parental perceptions of their weight status and how it affects their perceptions of their child's weight status. This study uses an educational intervention in which parents are informed of their actual weight status and how it affects their child's health. We will study the effect of this intervention on the parent's perceptions of and level of concern for their own and their child's weight status.