- Type 2 diabetes mellitus: Diabetes mellitus will be determined by medical records, current treatment, verification from personal health care provider, or test results meeting the 2010 American Diabetes Association criteria of fasting glucose ≥126 mg/dl, symptoms of hyperglycemia with casual plasma glucose > 200 mg/dl or two-hour plasma glucose ≥200 mg/dl after a 75 gram oral glucose load. Individuals who have a clinical history strongly suggestive of type 1 diabetes will be excluded. Individuals taking oral hypoglycemic medication with diet and exercise are eligible. Subjects taking insulin will not be eligible for entry into the study.