The keto (ketogenic) diet is a high-fat, low-carb diet designed to shift the body into ketosis, a state where fat is burned for energy instead of carbohydrates. Typically, the macro ratio is about 70–75% fat, 20% protein, and 5–10% carbs. It includes meat, fish, eggs, nuts, oils, dairy, and low-carb vegetables, while restricting grains, fruits, and starchy vegetables.