The principle of the diet is as follows: the body uses carbohydrates as the main “fuel” for the brain. With a sharp reduction in carbohydrates in the diet below 20 grams per day, the amount of glucose is critically reduced – and there is not enough energy for normal functioning and oxidation of fats. To nourish the brain, the body starts the process of obtaining alternative energy – ketosis. This is the process of splitting fat in the body, resulting in the formation of ketone bodies, which work as an alternative energy. An interesting fact, at first the keto diet was developed for completely different purposes. It was invented for people suffering from seizures.