Testing the Adipose Expandability Hypothesis in Vivo During Overfeeding
Trial Parameters
Brief Summary
Adipose, or fat, tissue is a plastic organ that retains the ability to expand and store excess calories during positive energy balance in humans. The capacity of subcutaneous (subQ) adipose tissue to expand and remodel is an important determinant of obesity-related health complications, and impaired expansion of subQ fat tissue is thought to contribute to the risk of diseases such as the Metabolic Syndrome (MetS) and type 2 diabetes mellitus (T2D). The objectives of the study are to evaluate the changes and mechanisms of (subQ) adipose tissue expandability that occur as a result of short-term weight gain and to investigate the effects on cardio-metabolic health outcomes. Findings from this study will provide new insight into the dynamics of adipose expansion and remodeling during changes in energy balance and how this may impact future fat tissue function and metabolic health.
Eligibility Criteria
Inclusion Criteria: * Men and pre-menopausal women * 18-42 years of age * BMI 23-35 kg/m2 (± 0.5 will be accepted) * Are willing to drink deuterium-labeled water (2H2O) for 8 weeks * Are willing to be randomized to either a CTL or 30% OF group * For women, if not using pharmaceutical (hormonal) contraception (i.e. birth control pills, vaginal ring, injections, or implant), must agree to use either a double barrier method as a form of birth control to prevent pregnancy (i.e. male condom with spermicide, with or without cervical cap or diaphragm); use implants or intrauterine contraceptive devices; have a tubal ligation (surgically sterile); practice abstinence; or be in an established relationship with a vasectomized or same sex partner during the entire duration of the study * Must be willing to adhere to all study procedures, including attendance at all study visits * If enrolled, agree to maintain the same level of physical activity throughout the duration of the study * Must be will