KU Alternate Meal Energy Level Study

Inclusion Criteria: 1. Age 21-65 years. 2. BMI 25-35. Patients with a BMI less than 25 are not classified as overweight and individuals with a BMI \>35 may require more aggressive weight management strategies. 3. Clearance for participation from their PCP. Exclusion Criteria: 1. Participation in a research project or formal program involving weight loss or exercise in the previous 6 mos., as these proximal experiences may impact the results of this study. 2. Participation in a regular exercise program (i.e., \> 500 kcal/wk. of planned activity as estimated by questionnaire \[34\]. 3. Not weight stable (-/+ 5%) for 6 mos. prior to intake. This will be determined by phone screen and self-report on the health history questionnaire 4. Unwilling to be randomized to one of two diet strategies for weight loss. 5. Pregnant during the previous 6 mos., lactating, or planned pregnancy in the following 6 mos. 6. Serious medical risk (e.g. diabetes, cancer, cardiovascular disease) as determined by the individual's physician via the clearance to participate in the investigation. 7. Disordered eating as determined by the Eating Attitudes Test using a score of 20 or greater \[35\]. This score indicates the need for counseling outside the scope of this study. 8. Current treatment for psychological problems, or taking psychotropic medications. Addressing psychological problems is outside the scope of this study. 9. Medications known to significantly influence weight. 10. Adherence to specialized diet regimens (e.g., multiple food allergies, vegan, etc.) 11. Do not have access to or independence over grocery shopping and meal preparation (i.e. those in military, college with cafeteria plan, etc.). 12. If participants have recently undergone CT (Computed Tomography), PET, fluoroscopic, or nuclear medicine studies within the past year.