The son of a Brooklyn baker, Dr. David M. Eisenberg, an associate professor at the Harvard Medical School and the Harvard School of Public Health, is the founder and chief officiant of "Healthy Kitchens/Healthy Lives," an "'interfaith marriage," as he calls it, among physicians, public health researchers and distinguished chefs that seeks to tear down the firewall between "healthy" and "crave-able" cuisine. Although physicians are on the front lines of the nation's diabetes and obesity crises, many graduate from medical school with little knowledge of nutrition, let alone cooking. It is a deficiency that is becoming increasingly apparent as the grim statistics climb.