Physiology - Regulation of Appetite and Food Intake

The goal of this study is to determine if estradiol and progesterone are involved in appetite regulation and energy balance. The study aims to complete a 13 day randomized controlled trial (RCT) where oral supplementation of estradiol only, progesterone only, a combination of each, or a placebo in young males will be provided. During the supplementation period, participants will complete two in-lab sessions where they will complete an acute bout of high-intensity interval training or a period of seated rest (completed on separate days by each participant) and have blood samples and perceptions of appetite measured taken over the course of the in-lab sessions. At the end of each session participants will consume an ad-libitum meal and participants will also track free-living energy intake and wear a thigh-worn accelerometer to measure energy expenditure for three days (day before, day of, and day after) each in-lab session.