A low-fat, “plant strong” diet can prevent and often reverse the diseases caused by the so-called Standard American Diet, including heart disease, diabetes, Alzheimer’s, and cancer, according to Engine 2 Diet creator Rip Esselstyn, a firefighter, former professional athlete, and medical scion. (His great-grandfather co-founded the Cleveland Clinic, and his father, Caldwell Esselstyn, a former Olympic rower and Cleveland Clinic surgeon, led landmark research on the prevention and reversal of heart disease through a plant-based diet.) In addition, you’ll lose weight, increase lean muscle mass, sharpen your mind, and energize your body.