Inclusion Criteria:  Body mass index (BMI) >= 25 kg/m^2 Age: 20-64.9 years Not currently participating in any weight loss intervention or meet the physical activity recommendation (150 min/week of moderate-intensity exercise or 75 min/week of vigorous exercise) The ability to walk two blocks Ability to speak and read English  Exclusion Criteria:  Prior cancer diagnosis (except non-melanoma skin cancer) or severe medical conditions such as unstable cardiovascular disease or digestive disorders that would preclude physical activity and dietary intervention Pregnant or nursing women Unable to give informed consent