Investigation Into the Effects of Blood Glucose Levels Upon Eating Behavior in Lean and Obese Non-diabetic and Diabetic Subjects

Inclusion Criteria: * A1c \< 10.5 % Exclusion Criteria: * BMI \<18 (no upper limit), * Creatinine \> 1.5 mg/dL, * Hgb \< 10 mg/dL, * ALT \> 2.5 X ULN, * untreated thyroid disease, * uncontrolled hypertension, * known neurological disorders, * untreated psychiatric disorders, * use of antidepressants and psychiatric medications, * use of weight loss medications in the 6 months prior to the study, * malignancy, * smoking, * current or recent steroid use in last 3 months, * history of current illicit drug use; * for women: pregnancy, or breastfeeding.