Diet interventions are provided by registered dietitians at the University of Alabama at Birmingham. Participants meet one-on-one with a dietitian at the baseline testing visit. Patients record food intake such that the dietitian can review them on a weekly basis, provide feedback, and tailor nutrition counseling; said counseling is delivered via phone and e-mail on a weekly basis throughout the 12-week intervention. Food records are analyzed for macronutrient composition, a range of micronutrients, and glycemic index.