Over 50 years ago, Dr. William Hay concluded that the body uses acids to digest proteins and alkalis to digest starches, and that mixing the two might lead to painful indigestion and more serious problems such as ulcers, allergies, and obesity. Though criticized at the time, the Hay System has been vindicated by modern research, and provides essentially the healthy, whole-food diet of mostly alkali-forming foods such as fruits, green vegetables, and...