Clinical Trials

Background: Type 2 diabetes is a disease that affects blood sugar levels. Complications can include heart and blood vessel (vascular) diseases. Rates of type 2 diabetes have tripled in children and young adults over the last 40 years. Vascular diseases are also increasing in young people. Objective: To learn more about factors, including type 2 diabetes, that may cause vascular disease in young people. Eligibility: People aged 12 to 25 years who (1) have type 2 diabetes; (2) are overweight but not diabetic; (3) or are lean and healthy. Biological parents are also needed. Design: Young participants will visit the NIH clinic once a year for up to 25 years. Each visit will take 4 days. Before each visit, participants will wear devices to track their sleep, activity, and blood sugar levels for 7 to 10 days. At each visit, participants will have tests including: Samples: They will provide blood, urine, and stool samples. Heart: They will ride a stationary bike for 6 minutes with stickers applied to their chest. Scans: They will lie on a bed that slides into a tube; the machine will take pictures of the inside of their body. Energy: They will wear a hood over their head to measure the air they breathe. Social stress: They will give a speech for 10 minutes to show their body s response to stress. Glucose: They will drink a sweet drink to see how their blood sugar changes. Biological parents will have 1 study visit. They will have blood tests. They will fill in questionnaires about their lifestyle and stress. ...

Obesity and its metabolic complications are leading causes of global morbidity and mortality. Evidence is mounting that inappropriate timing of food intake contributes to obesity. Specifically, late eating is associated with greater weight gain and metabolic syndrome. However, the mechanism by which late eating harms metabolism is not fully understood but may be related to mis-timing of food intake in relation to the body's endogenous circadian rhythm. Conversely, harmonization of eating timing with endogenous circadian rhythm may optimize metabolic health. In this study the investigators will use gold-standard methods of characterizing circadian rhythm in humans to examine the metabolic impacts food timing relative to endogenous circadian rhythm.