A high-fat, low-carb, diet that has become popular in recent years may extend a person's lifespan, a new study finds. Researchers at Stanford University, in the Bay Area, found that the ketogenic diet, often referred to as keto, can help muscle and stem cells survive stress and allow a person to live longer. Keto diets are extremely low-carb, but very high in fat. This trains the body to become efficient ...