- Resting metabolic rate (kcal/d) to determine the energy levels of individualized meal plans, which will be calculated as (RMR x PAL) - 500 kcal/d. RMR will be measured using continuous open-circuit indirect calorimetry using a MAX-IIa instrument (AEI Technologies Inc.). RMR measurements will be conducted with participants lying awake but at complete physical rest, with a ventilated hood placed over the head and neck. Participants will undergo measurement for 30 to 40 minutes; the first 5 to 10 minutes of data will be discarded to allow for acclimation to the testing environment. We will provide a juice box and granola bar after this test so that participants are not hungry. For consistency across study visits, we will measure participants in the follicular phase of their menstrual cycles.