Study Investigating Metabolism and Body Size in Healthy Individuals and Those with Metabolic Conditions

What this Trial Is About

Researchers are investigating how metabolism, body composition, and body surface area relate in both healthy individuals and those with metabolic conditions such as diabetes, obesity, renal disease, or cancer. The study aims to improve the accuracy of metabolic rate measurements, which have traditionally relied on simple formulas using height and weight, which may not work well for everyone. Participants will spend two days and one night in the hospital during each visit. They will provide medical history, answer questions about their activity, diet, and lifestyle, and consume a special diet. They will undergo various tests including breathing gas measurements while lying under a clear hood, body scanning on a padded table and with a 3D scanner, electrical signal speed testing through the body, hand strength measurement, and collection of blood and urine after drinking salty water. Participants may return up to eight times per year with at least two weeks between visits. During the study, participants will be evaluated through these tests and questionnaires to understand their resting energy expenditure and body measurements. The primary outcomes include comparing measured versus predicted body surface area and determining how measured body surface area relates to energy expenditure independent of body composition. The study will continue until July 2031, and participants health and ability to complete tests will be monitored throughout their involvement.

A Natural History Study of Metabolic Sizing in Health and Disease