The Ornish Diet is a popular diet plan that promises to help reverse chronic disease and enhance health. It involves making comprehensive lifestyle changes and following a low-fat, plant-based diet filled with fruits, veggies, whole grains, and legumes. However, it also restricts several healthy food groups and may increase your risk of nutritional deficiencies without proper planning.The Ornish Diet is a plan developed by Dr. Dean Ornish, a physician, researcher, and founder of the Preventive Medicine Research Institute in Sausalito, California. The plan is essentially a low-fat, lacto-ovo-vegetarian diet that focuses on plant-based ingredients like fruits, veggies, whole grains, and legumes. Other foods are also permitted on the plan, including soy products, egg whites, and limited amounts of non-fat dairy. According to the diet's creator, simply switching up your eating pattern can promote weight loss and reverse the progression of chronic conditions like prostate cancer, heart disease, and diabetes. It's said to work by activating health-promoting genes while reversing aging at a cellular level.