I’ve had this book for 40 years! I’ve lost all the weight I needed. Loved eating this way and don’t know why I quit. It’s not difficult. Makes sense and is simple to learn the concept. Way simple. But the book teaches the science behind him. Henry Ford ate this way because of it being based on the study of natural science. I like and have made many of the recipes in this book but you can just eat this way on your own. Eating in restaurants is a breeze.