Case Scenario:

Jared and Matthew are identical twins who grew up together but have lived apart since college. Jared lives in New York City and is a certified public accountant in a high$-$profile accounting firm, working long hours in a stressful environment. Matthew attended college in California, where he studied nutrition and exercise physiology and now manages the wellness program at a large fitness center. At age $30$ the two brothers are noticeably different in weight and body shape. Jared has a body mass index of $29$ compared to Matthew's $23.$ Jared has developed central obesity, hypertension, and problems with blood sugar regulation, all signs of a tendency toward developing type $2$ DM$.$ In contrast, Matthew is lean and has normal blood pressure and normal blood sugar levels.