In this book "Conquer your diet," Dr. Graham introduces the surprising new science of metabolism and weight loss. He reveals that healthy body fat can help you lose weight; your metabolism at 60 can be the same as when you were 20; yo-yo dieting can actually benefit your health; fasting windows of 8 hours can be as effective as fasting windows of 12 hours; and losing even a small amount of weight can have a significant impact on your overall health.