When should we eat, and when shouldn’t we? The answers to these simple questions are not what you might expect. As Steve Hendricks shows in The Oldest Cure in the World, stop eating long enough, and you’ll set in motion cellular repairs that can slow aging and prevent and reverse diseases like diabetes and hypertension. Fasting has improved the lives of people with epilepsy, asthma, and arthritis, and has even protected patients from the worst of chemotherapy’s side effects.