Following breakfast, postprandial energy expenditure will be assessed every hour using the indirect calorimetry cart. At each hour of this 5-h period, participants will fill out a visual analog scale to assess their feelings of appetite and satiety and will perform a computer task assessing prospective food intake. Immediately after breakfast, and at 30, 45, 60, 120, and 180 minutes after breakfast, a blood sample will be drawn from the catheter for metabolite and hormone measurements.