A Lifestyle Change Program to Prevent Type 2 Diabetes

Inclusion Criteria * age 21 or older * medically stable and safe to exercise * at high risk for type 2 diabetes * able to speak English. Exclusion Criteria * Type 2 diabetes * Cardiovascular disease * Cancer requiring treatment in the past 5 years * Anemia * Hepatitis * Renal disease * Gastrointestinal disease * Recent or significant abdominal surgery * Pulmonary disease with dependence on oxygen or daily use of bronchodilators * Chronic infection (ie., HIV, active tuberculosis) * Unable to walk 0.25 miles in 10 minutes * Participation in commercial diet program * Currently pregnant or within 3 months postpartum * Currently nursing or within 6 weeks of having completed nursing * Treatment of impaired glucose tolerance (IGT) with metformin * Currently taking any glucocorticoid or beta-blocker * Recently prescribed or changed dose of a statin (within 2 months)