Effects of Low Fat Versus Low Carbohydrate Diets on Energy Metabolism

Healthy Clinical Trial

Official title: Effect of Low Fat Versus Low Carbohydrate Diets on Energy Metabolism

Status Completed

Clinical Trial Summary

Background: Researchers want to learn how different diets affect hormone levels, body weight, energy expenditure, liver fat, and more. To do this, they will use specialized techniques and food plans. This is not a weight loss study. Objective: To better understand how low-fat and low-carbohydrate foods affect health. Eligibility: Men and women ages 18-50 who have a stable body weight and can exercise daily Design: Participants will have a screening visit that lasts 4-6 hours. It will include: Medical history Physical exam Fasting blood and urine tests Questionnaires Trying foods from the study Participants will be admitted to the Clinical Center and will stay for 4 weeks without leaving. They can have visitors. Participants will wear activity and glucose monitors throughout the study. They will be weighed daily and will complete daily exercise. They will eat 3 meals daily, plus snacks. They will give urine, saliva, and blood samples. They will fill out questionnaires and rate their hunger, appetite, and sense of taste. They will have body scans. For the scans, they will lie in a machine that takes X-ray pictures of the body. Participants will complete activities to measure how many calories they burn and how the diets affect them: Participants will drink special liquids to measure calories burned, sugar, and sense of taste. Participants will wear a plastic hood while resting. Participants will stay alone in a special room for 24 hours. Participants will eat a low-carb, high-fat diet for 2 weeks and a high-carb, low-fat diet for 2 weeks. Participants may be dismissed if they purposefully use the study to try to change their body weight. Sponsoring Institution: National Institute of Diabetes and Digestive and Kidney Diseases ...

Clinical Trial Description

Competing theories about obesity and its treatment contrast the relative roles of dietary fat versus carbohydrate on promotion of excessive calorie intake. Advocates of low-carbohydrate diets propose that diets high in carbohydrates lead to elevated insulin secretion and increased calorie intake. Alternatively, proponents of low-fat diets argue that diets high in fat promote passive overconsumption due to the high energy density and low satiety index of high-fat foods. Therefore, we will conduct a feeding study in 20 adult men and women to investigate the differences in ad libitum energy intake resulting from consuming two test diets for a pair of 2-week periods in a randomized, crossover design during a single 4-week inpatient period. The test diets presented to participants will be matched for calories and protein, but the low-carbohydrate diet (approximately10% of calories) will be high in fat (approximately75% of calories) whereas the low-fat diet will be high in carbohydrates (approximately75% of calories) and low in fat (approximately 10% of calories). ;

Related Conditions & MeSH terms

• Healthy
• Healthy Volunteers

• NCT number: NCT03878108
• Study type: Interventional
• Source: National Institutes of Health Clinical Center (CC)
• Status: Completed
• Phase: N/A
• Start date: April 15, 2019
• Completion date: September 1, 2020