The medical pathologist at New York hospital was shocked. He found that Pritikin's arteries were clean and smooth. With God's healing power, and living the diet-exercise principles that he taught, Pritikin had cured himself . Dr. Diehl worked at Nathan Pritikin's medical center for several years. Dr. Diehl is now a world authority on preventive medicine.
Preventive medicine involves lifestyle changes using diet and exercise.