There is a whole area of food digestion problems few people know anything about. This is "food intolerances" first described by Dr. Abrams of Stanford University around 1900 and followed up by Dr. O. G. Carroll, N.D. from Spokane, WA. This involves enzyme deficiencies and the resulting failure of digestive breakdown. http://www.truthquest2.com/drOGCarroll.htm Follow the Dr. Dick "His Story" link for an example of the devastation undiagnosed food intolerances can cause. I'm a living witness. "Indigestion" nearly killed me.