Metabolism, Exercise and Nutrition at UCSD (MENU Study)

Inclusion Criteria: * Aged 21 years and older * Have BMI \>30.0 kg/m2 and \<40 kg/m2 * Willing and able to participate in clinic visits, group sessions, and telephone and Internet communications at specified intervals * Able to provide data through questionnaires and by telephone * Willing to maintain contact with the investigators for 12 months * Willing to allow blood collections * No known allergy to tree nuts * Able to be physically active Exclusion Criteria: * Diabetic * Inability to be moderately physically active * A history or presence of a comorbid diseases for which diet modification and increased physical activity may be contraindicated * Currently pregnant/breastfeeding * Planning to become pregnant within the next year * Currently enrolled in a weight loss program or diet intervention study * Current use of weight loss medication or supplements * Planned surgical procedure that can impact the conduct of the study * Have plans to relocate from area within the next year * 6+ months use of meds likely to cause weight gain or prevent weight loss * Any condition which in the opinion of the investigator makes the subject unsuitable for inclusion in this study