I have had this book before but loaned it out and never got it back. I followed Matsen's program of eating, and not only lost weight but put my body back into good working order. I found out the things that I was eating that were not healthy, and omitted them from my diet, I grew to understand how my body works when I consume food, and so enjoyed learning from the clever pictures in the book. I am again going to use this book to help me get back into health again. I have even ordered one for a friend who is having trouble with her body so she can learn for herself how it works. I thank John Matsen every day for the things he has taught me.