Impact of Sleep and Meal Timing on Food Intake Regulation

The subject will be inpatient for 5 days, and sleep between the hours of 0000-0800 h, with meals at 1, 5, 11, and 12.5 (snack) h after awakening every day for 5 days. On night 3, we will insert a catheter in the participant's arm to facilitate multiple blood sampling overnight and the next day. On d 4, a frequently sampled i.v. glucose tolerance test (FSIVGTT) will be performed. A MTT will be performed at the scheduled lunch. At 1 h before dinner, participants will undergo fMRI scanning to assess neuronal responses to food stimuli and to examine functional connectivity with reward circuitry. On d 5, participants will be allowed to determine their own food intake at the scheduled meal and snack times. Participants will be discharged upon awakening on day 6.

The subject will be inpatient for 5 days and sleep between the hours of 0000-0800 h,with controlled meals at 4.5, 8.5, 14.5, and 16 (snack) h after awakening. On night 3, we will insert a catheter in the participant's arm to facilitate multiple blood sampling overnight and the next day. On d 4, at the scheduled breakfast time, a frequently sampled i.v. glucose tolerance test (FSIVGTT) will be performed. A MTT will be performed at the scheduled lunch. At 1 h before dinner, participants will undergo fMRI scanning to assess neuronal responses to food stimuli and to examine functional connectivity with reward circuitry. On d 5, participants will be allowed to determine their own food intake at the scheduled meal and snack times. Participants will be discharged upon awakening on day 6.

The subject will be inpatient for 5 days, and sleep between the hours of 0330-1130 h, with controlled meals at 1, 5, 11, and 12.5 (snack) h after awakening. On night 3, we will insert a catheter in the participant's arm to facilitate multiple blood sampling overnight and the next day. On d 4, at the scheduled breakfast time, a frequently sampled i.v. glucose tolerance test (FSIVGTT) will be performed. A MTT will be performed at the scheduled lunch. At 1 h before dinner, participants will undergo fMRI scanning to assess neuronal responses to food stimuli and to examine functional connectivity with reward circuitry. On d 5, participants will be allowed to determine their own food intake at the scheduled meal and snack times. Participants will be discharged upon awakening on day 6.

The subject will be inpatient for 5 days, and sleep between the hours o 0330-1130 h, with controlled meals at 4.5, 8.5, 14.5, and 16 (snack) h after awakening. On night 3, we will insert a catheter in the participant's arm to facilitate multiple blood sampling overnight and the next day. On d 4, at the scheduled breakfast time, a frequently sampled i.v. glucose tolerance test (FSIVGTT) will be performed. A MTT will be performed at the scheduled lunch. At 1 h before dinner, participants will undergo fMRI scanning to assess neuronal responses to food stimuli and to examine functional connectivity with reward circuitry. On d 5, participants will be allowed to determine their own food intake at the scheduled meal and snack times. Participants will be discharged upon awakening on day 6.