Phase II had a 2x2 factorial design to test the effectiveness of weight loss and sodium restriction alone and in combination in reducing blood pressure and decreasing the incidence of definite hypertension. Lifestyle interventions were administered through counseling sessions at each center. Blood pressure, weight, body mass index, skin fold thickness, and urine electrolytes were measured at baseline and at six month intervals for a minimum of 36 months. Recruitment began at the end of 1990 and was completed in March 1992. Intervention and follow-up were completed in March 1995. Data analysis continued through June 1998 under U01-HL-37852, the coordinating center.