The Fuel and Rhythm (FAR) Phase 2 Study

Inclusion Criteria: * Consent to participate in the study * Men and women ≥ 65 years old * Self-reported difficulty walking ¼ mile or climbing a flight of stairs * Self-reported sedentariness (\<150 minutes structured exercise per week) * Walking speed \<1 m/sec on the 4 m walk test * Able to walk unassisted (cane allowed) * Have a body mass index between 25 - 40 kg/m2 (inclusive) * HbA1c \< 5.7 % Exclusion Criteria: * Fasting \>12 hours per day * Actively trying to lose weight by participating in formal weight loss program or significantly restricting calorie intake * Resting heart rate of \>120 beats per minute, systolic blood pressure \> 180 mmHg and/or diastolic blood pressure of \> 100 mmHg * Unstable angina, heart attack or stroke in the past 3 months * Continuous use of supplemental oxygen to manage a chronic pulmonary condition or heart failure * Rheumatoid arthritis, Parkinson's disease or currently on dialysis * Active treatment for cancer in the past year * Diabetes Mellitus * Known history of skin sensitivity or allergic reaction to adhesives * Taking medications that preclude fasting for 16 hours (e.g. must be taken with food at least 12 hours apart) * Any condition that in the opinion of the investigator would impair ability to participate in the trial