Keto diets mainly involve the drastic reduction of one’s carbohydrate intake, and replacing it with fats. Reducing the carb content like this puts the body in a metabolic state known as ketosis. In this state, your body is able to efficiently burn fat for energy. It can also convert fats in the liver into ketones. This helps supply energy for the brain. Keto diets can have several health benefits, such as reduced blood sugar and insulin levels.