Weight Loss Maintenance in Primary Care

Inclusion Criteria: * BMI of 30, or BMI of 27 with weight-related comorbidities * Access to a telephone and voice mail/answering machine * MUST be seeing a primary care physician working with us on this study (in the greater Philadelphia area) Exclusion Criteria: * Previously/currently diagnosed with an eating disorder * Current bi-polar, depression, substance abuse, or dependence disorder * Living with someone already enrolled * Enrolled in another weight loss program * Current disorder/medications affecting body weight or energy expenditure (e.g. thyroid disease) * Myocardial infraction within the past three months * Unstable angina * Nephrotic syndrome/malabsorptive disease * Gout attack within the past year * Lactating/pregnant (or planning within next two years) * Current/recent history of cancer, neurological disease, high creatinine levels, active hepatic disease