Inclusion Criteria:  BMI >30 kg/m2 If taking probiotics during screening, must agree to continue taking them at the same dosage and frequency HbA1C 5.7-6.4% Willing to eat only the food provided Willing to follow the feeding schedule, including fasting for 14 hours/day for 7 days Willing to remain on the RU inpatient 24/7 unit except for weekend passes Normally sleep between the hours of 10 pm and 8 am Weight stable over the last 3 months defined as no more than a 5% change  Exclusion Criteria:  Diabetes Any intermittent feeding diet within the last 2 weeks HIV positive Hepatitis Self-reported autoimmune diseases (rheumatiod arthritis, SLE (lupus), Crohn's Disease, psoriasis, etc.) Current use of metformin Smoked tobacco within the last 8 weeks Taking any weight loss medication Current use of systemic steroids Allergic to adhesive tape Taking clinically useful medications that contribute to significant weight loss or weight gain ie triclyclic antideprssants, some SSRIs, lithium, antipsychotics, some anticonvulsants, steoids, beta blockers, some antihistamines. Currently pregnant Any medical, psychological or social condition that, in the opinion of the Investigator, would jeopardize the health or well-being of the participant during any study procedures or the integrity of the data