Dr. Jason Feng tells us in this book that everything is interested in losing weight is a mistake, as weight gain and loss is a matter of hormone, and the only way to answer a question why we become two religion? How do we do that? It also explains how intermittent fasting can break the insulin resistance circle, and reaches a healthy weight by restoring balance to secrete hormones in the body. The question that arises strongly now; How did obesity become an epidemic?