Weight Loss and Abdominal Fat Responses to Different Diet Compositions

Inclusion Criteria: * Females between 18 and 65 years of age. * BMI 30-40 kg/m2 * Stable weight within 10 lb (+/-) for last 2 months Exclusion Criteria: * Pregnant or lactating. * Must not currently be part of a structured weight loss program * Taking a medication for diabetes (such as insulin, metformin, glyburide, glipizide, Byetta, pioglitazone, or rosiglitazone) or a medication such as systemic glucocorticoids that are known to affect blood sugar or blood insulin. * Beck Depression Inventory (BDI Score \>19 and/or positively endorses the suicide question on the BDI-II) * Taking any chronic medication that has not had a stable dose for 1 month or longer. * Diabetes mellitus defined as a fasting glucose ≥ 126 mg/dL on screening. * Taking medications or dietary supplements that cause weight gain or weight loss (eg. antipsychotics (Seroquel, Zyprexa, and Risperdal) and/or anorectics). * Clinically significant laboratory abnormalities at the opinion of the investigators. * History of Bariatric Surgery * A history of: * Type 2 diabetes, type 1 diabetes, or diabetes that is a result of pancreatic injury, or secondary forms of diabetes, e.g. Cushing's syndrome and acromegaly. * Liver disease, such as cirrhosis, or chronic active hepatitis B or C. * Use of investigational drugs within 30 days of visit 1 * A pacemaker. * Hospitalization for depression in the past 6 months, history of moderate to severe major depression. * Any other condition that in the investigators' or sponsor's opinion could interfere with the results of the trial.