Obesity Clinical Trials

Background: - The way that the body burns calories is known as energy expenditure. Some studies show that when we are cold, we burn more calories to keep our bodies warm. Brown fat is a special kind of fat that can use energy to keep the body warm. Small animals and infants have been known to have brown fat for many years. Recently, it has been suggested that adult humans also have brown fat. If brown fat becomes active (burns calories) in adult humans when exposed to cold, then these people would tend to burn off more calories and might not gain weight easily. Learning more about the relationship between energy expenditure, brown fat, environmental temperature, and body temperature may help explain why some people become obese and other people do not. Objectives: * To better understand how the body burns calories when exposed to different temperatures. * To study brown fat and how it burns calories in cold temperatures. Eligibility: * Healthy men between 18 and 35 or 55 and 75 years of age. * Healthy women between 18 and 35 years of age. * To control for ethnicity, participants must be non-Hispanic whites or African Americans. Design: * Participants will be screened with a physical exam and medical history. Blood and urine samples will be collected. * Participants will stay in the Metabolic Unit of the National Institutes of Health Clinical Center as inpatients for no more than 14 days. The length of the hospital stay will depend on how participants respond to the different study temperatures. * Every afternoon, participants will walk for 30 minutes on a treadmill. All meals will be provided. * Participants will stay up to 5 hours per day in a specialized room with different temperature settings. Temperatures will range from about 61 degrees to 88 degrees Fahrenheit. Body temperature, activity, calorie burning, and cold/hot sensations will be monitored. On the study day of the coldest temperature, participants will have an imaging study to look for brown fat activity. * Participants will be compensated for their time and participation at the end of the study.... Read Less

Adults who gain most of their excess weight in the abdominal area typically do not respond to factors that "turn on" fat cells the same way as people who don't have excessive weight. Researchers are trying to understand why fat tissue responds differently in people with different body types. Read Less

Background: Heart disease is a leading cause of death. People can reduce their heart disease risk by exercising more. Mobile health technology may make people more successful at increasing their exercise. This includes things like physical activity monitors and smartphone apps. Objective: To find out if mobile health technology can increase physical activity. Eligibility: African American women ages 21-75 who: * Are overweight or obese * Live in certain areas near Washington, DC * Have a smartphone that can use the study app Design: At visit 1, participants will * Answer survey questions. These may be about medical history, physical activity, and weight. They may also cover body image, health perception, and spirituality. * Have body size measured and get blood tests * Get a device to wear on the wrist. It will record physical activity and hours of sleep. * Learn how to download and use the study mobile app For 2 weeks, researchers will collect data about participants physical activity. Then participants will have a study visit with additional blood tests. All participants will get messages from the app that encourage exercise. Some participants will get data from the app about exercise near their home or work. Some participants may get face-to-face coaching. Participants may get wireless devices. These measure body weight, blood pressure, and blood glucose. Participants can measure these at home and upload the data to the app for the study. Participants will have visits after 3 and 6 months. They will repeat the visit 1 tests. Read Less

Background: Researchers use mixed meal tolerance tests (MMTTs) to look at how people s bodies respond to eating a meal. However, researchers do not agree on how to decide the number of calories to give in each meal. Some use fixed meals, which are the same size for everyone, and some use adjusted meals, based on the size of the person s body. Researchers want to know which MMTT is best to use for future research. Objective: To learn how fixed vs adjusted meals affect blood glucose levels in healthy people. Eligibility: Healthy people aged 18 years or older. Design: Participants will have 3 or 4 clinic visits of up to 8 hours in 8 weeks. Participants will have baseline tests: Their height, weight, and waist size will be measured. They will have an oral glucose tolerance test: A needle attached to a tube (IV) will be inserted into a vein in the arm. They will have a sugary drink. Blood samples will be taken from the tube at intervals up to 3 hours after the drink. They will have a body scan. Participants will have 2 MMTT visits. One will include a fixed meal and one will include an adjusted meal. They will have tests at both visits: Resting metabolic rate: A clear hood will be placed over the participant s head while they rest for 20 minutes. This will measure the oxygen they breathe in and out. MMTT. Participants will have 5 minutes to drink a liquid meal. Blood samples will be taken at intervals for the next 4 hours.... Read Less

The focus on this application is low-income, rural patients, since cardiovascular disease (CVD) prevalence is 40% higher among rural than urban residents. Health behavior counseling and follow-up care are required for patients with an elevated body mass index who have increased risk for CVD. Counseling is most effective when developed with, and tailored to, the patient and offered with resources that support healthy food intake and physical activity. Resource referral and follow-up is particularly important in rural low income residents who often have more severe social needs that impede healthy behaviors. The proposed research will leverage the candidate's digital health tool (PREVENT) for healthcare teams to use within the clinic visit. PREVENT visually displays patient-reported and electronic health record (EHR) data to facilitate counseling and deliver tailored physical activity and healthy food intake goals and resources. PREVENT may improve the quality of required care and promote cardiovascular health equity. This research will: 1) collaborate with rural and clinic partners to modify and integrate the PREVENT tool for low-income, rural patients with obesity (Aim 1); and 2) conduct a pilot pragmatic clinical trial of PREVENT to optimize feasibility, acceptability, appropriateness, and potential health equity impact. Read Less

This study will look at how well CagriSema helps people living with obesity to lose weight and maintain the weight loss long-term. The study has 2 parts: The first part is called 'the main study' and the second part is called 'the extension study'. In the main study participants will either get CagriSema (a study medicine) or placebo (a dummy medicine that looks like CagriSema but has no active ingredient). Which treatment participants get is decided by chance. Participants are two times more likely to get CagriSema than placebo. If participants get CagriSema in the main study, participants will continue on CagriSema in the extension study. Which dose of CagriSema participants will continue on is decided by chance. If participants get placebo in the main study, participants will get CagriSema in the extension study. Participants will take one injection of study medicine once a week. The study will last for about 3 years and 3 months. Read Less

The study will assign participants to take either the medication, empagliflozin or a placebo for 12 weeks. The goal of the study is to determine the effects of empagliflozin on arterial health in Veterans with obesity. Read Less

Protocol Number: 22DK0002 Title: Effects of Ultra-processed versus Unprocessed Diets on Energy Metabolism Background: Many diets worldwide include both processed and unprocessed foods. Researchers want to study the effects these foods have on a person s health. Objective: To study how different diets affect a person s health and metabolism. Eligibility: Adults aged 18 60 without diabetes who have stable weight and can exercise. Design: Participants will be screened with: Medical history Physical exam Heart tests Resting energy expenditure (to determine calorie needs) Blood and urine tests 20-minute stationary bicycle session Food, diet, and mental health questionnaires Participants will stay at NIH for 4 weeks. They will receive 3 meals a day and may eat as little or as much as they want. The diet will change each week. Their weight will be recorded daily. They will ride a stationary bicycle daily. Each week, they will do the following: Spend 1 day in a special room that assesses their metabolism Have 24-hour urine collections Give skin and fecal samples Repeat some screening tests Have scans to measure body fat Complete computerized behavior tasks Wear an activity monitor to track physical activity Wear a glucose monitor. A sensor will be inserted under the skin with a small needle. It will be replaced weekly. Take taste tests. They will swish water and flavored liquids around in their mouth and pick which ones had a non-neutral taste. They will also compare liquids for which ones taste better. Participation will last for 4 weeks. Sponsoring Institution: National Institute of Diabetes and Digestive and Kidney Diseases ... Read Less

Obesity is associated with increased cardiometabolic disease risk due, in part, to heightened chronic inflammation arising from adipose tissue. There are no current targeted therapies to prevent or reverse the chronic inflammation of obesity, and a better understanding of these inflammatory pathways in humans is key to future therapeutic interventions. This trial will determine both the anti-inflammatory potential of the SGLT2 inhibitor empagliflozin, and the contribution of adipose inflammation to surrogate measures of cardiovascular disease in a randomized controlled trial of obese patients. Read Less

This project will conduct a pilot hybrid study that examines the implementation (Aims 1 \& 2) and preliminary effectiveness (Aim 3) of PREVENT, a digital health intervention, among patients with overweight/obesity (N=100) using a clinic-randomized design. The central hypothesis of the study is that PREVENT will be feasible and show improvements in health behavior counseling and the patient experience that will improve patients' motivation to change, and their CVH health behaviors and outcomes. Read Less

In the U.S. it is recommended that children consume whole cow's milk (3.5% fat) from ages 1 to 2 years to support rapid early growth and brain development, and then at age 2 years transition to low-fat (1%) or non-fat milk to reduce saturated fat and calorie intake. To date, few studies have examined the optimal milk type for children to prevent obesity. This randomized controlled trial will evaluate the effect of consumption of whole versus 1% milk on child adiposity. Read Less

This study is open to adults between 18 and 65 years of age who have obesity. People can join the study if they have a body mass index (BMI) between 30 and 45 km/m². The purpose of this study is to find out whether a medicine called survodutide improves how the body uses energy and breaks down fat. This study compares survodutide with another medicine called semaglutide. Survodutide is being developed to treat people with obesity. Semaglutide is already used to treat people with obesity. Participants are put into 2 groups by chance. One group gets survodutide and the other group gets semaglutide. Participants get survodutide or semaglutide as an injection under the skin once a week. Participants are in the study for 8-10 months depending on how long the treatment is given. During this time, they visit the study site weekly. Some of the visits may also be done at the participant's home instead of the study site. At some of the visits, doctors test how much energy a participant's body uses. This is done in a special room where they measure the oxygen that is breathed in and the carbon dioxide that is breathed out by the participant. The results are compared between the 2 groups to see whether the treatment works. The doctors also regularly check participants' health and take note of any unwanted effects. Read Less