I also had intractable diarrhea for over three months, and nothing the medical doctors tried helped. Everything I ate just went right through me. After about two weeks on Dr. Koop’s Clinical Nutrition Program (NRT) I began to see improvement. The whole food supplements were actually targeting my thyroid and kidneys. Dr. Koop also found that I had a food allergy to wheat. Within 4 weeks on the program my bowel movements were back to normal. I am still on the program to remove a heavy metal toxicity in my body. Thanks again, Dr. Koop!