Inclusion Criteria:  Adults between 20 to 79 years years old No personal history of type 2 diabetes Body mass index ≥ 25 kg/m2 High risk for type 2 diabetes  Exclusion Criteria:  Chronic ischemic heart disease: acute myocardial infarction, stable angina, unstable angina. Stroke. Use of anticoagulants Severe renal failure Heart failure. Cannot do moderate-intensity physical activity Cannot attend most sessions Pregnancy or plans of having during the next sixth months Cancer or chemotherapy. Use of medications that affect weight (e.g. levothyroxine, pregabalin, orlistat)