Diabetes is an affliction of modern life. Americans have abundant and relatively inexpensive food. We have a lack of interest and/or time for exercise. We are predisposed toward a high incidence of the disease and its devastating consequences.

Diabetes is a disorder of the metabolism. Its signature — high blood sugar — is the result of the body not producing enough insulin or the cells not properly using the insulin that is produced. It is nasty business: Diabetes can deprive people of their sight, their limbs, their lives.

There are three types: Type 1, commonly called juvenile diabetes because it presents early in life, requires insulin injections because the body just doesn’t make enough. Type 2, commonly called adult-onset diabetes, results from resistance to insulin—the body doesn’t use the hormone properly. Gestational diabetes occurs among woman without a history of diabetes but whose pregnancies raise their blood sugar; it can predispose them toward Type 2 diabetes.