The purpose of this study is to examine the effectiveness of 3 behavioral weight loss programs- Weight Watchers, university-based behavioral weight loss treatment, and a combined approach which includes university-based treatment followed by Weight Watchers.

Inclusion Criteria:

• Age between 30-65 years
• BMI between 27-50 kg/m2
• Written approval/consent from primary health care provider

Exclusion Criteria:

• Unable to walk 2 blocks without stopping.
• Currently participating in a weight loss program or taking weight loss medication.
• Participated in a weight loss program in the last year
• Took weight loss medication in the last 6 months.
• Participated in Weight Watchers in last 2 years.
• Lost >=5% of body weight during 6 months prior to screening.
• Pregnant, lactating, less than 6 months postpartum, or plan to become pregnant during study time frame.
• Report conditions that in the judgment of the principal investigator would render them potentially unlikely to follow protocol for the 12 month study.
• Report a medical condition that would affect the safety and/or efficacy of a weight management program involving changes in diet and physical activity.