This book saved my life back in 1988. I was lent this book by a friend, and after reading it cover to cover, I was so impressed by how logically it was presented - so easy and interesting to read, that I went on the Pritikin regression diet and stayed on it for 10 years. After two failed angioplasties, back in 1988, I was considering a heart bypass operation, but meanwhile, I started the diet and after a month, I was almost free of Angina, and I made an amazing improvement over the next 12 months to the extent that I no longer needed any angina medication at all, as the symptoms had disappeared. So I was able to postpone the bypass until 2011, and I only needed it then because I went off the diet after being on it 10 years. The Pritikin regression diet is very hard to stick to, but if your at deaths door, then it is a viable option