Hi Caryl, >>The trouble with the Rivera/Deutsch >>book is that I have no idea what ALCAT >>means!) As Don pointed out the ALCAT test is a blood test for food sensitivities. I took the test three times and got three vastly different results which raised a credibility issue. The last time i even flew to Florida so my blood would be fresh. I have not had much luck with any test for food sensitivities. My biggest breakthrough was when i simply eliminated the foods that are recognized as the top problem causers (this list is amazingly close to Ray's list of foods to avoid), although i still have not achieved good health. Good luck, mark