The typical American diet can be considered a health threat. The combination of processed food, excess red meat, high salt and excess sugar are associated with the high incidence of obesity, diabetes-2, heart disease, certain cancers, and other diseases. But there is a solution. Walter C. Willett, M.D., Dr. P.H., Professor of Epidemiology and Nutrition at Harvard T.H. Chan School of Public Health and Professor of Medicine at Harvard Medical School.