Think Health! A Personal Weight Management Program, or "¡Vive Saludable! Un programa personalizado de control de peso" aims to improve the treatment of obesity in adults in the general population, by conducting research with men and women recruited from primary care medical practices. The study has a particular focus on African Americans and Latino. The design is randomized trial of the effectiveness of two versions of a lifestyle weight loss program called delivered by primary care providers (PCP) and ancillary staff at 5 clinical practice sites to their own patients. The two versions of the lifestyle weight loss program are called Basic (minimal counseling provided by PCP every four months) and Basic Plus (same PCP counseling plus additional counseling by specially trained ancillary practice staff acting as Lifestyle Coaches (LC), monthly for the first 12 months and then every other month for up to 2 years).