A Keto Diet is a lower carb diet, moderate protein and high-fat diet. Basically, you are drastically reducing your carbohydrate intake and replacing it with fat. When you reduce your carbs, the body is induced into a metabolic state called ketosis. When this happens, your body starts to turn fat into ketones in the liver which also supply energy for the brain.
Usually when you eat something high in carbs, your body produces glucose and insulin.
Glucose is a type of sugar that the body gets from foods that are rich in carbohydrates such as potato’s, bread, rice and so forth. It is the easiest molecule in the body to be converted and used as energy over all the other energy sources in the body.
Insulin is a hormone and its job is to move the glucose in your bloodstream and take it around the body.
So on a typical diet where carbohydrates are moderate to high, the body will end up using glucose as the primary source of energy. When you reduce your intake of carbs, the body is then induced into a state called ‘ketosis’. During this state, the body is producing ketones which are being produced in the liver from the breakdown of fats. The ketones are used as fuel throughout the entire body including the brain. While the body is in ketosis mode, your body has now switched its fuel supply to run pretty much on just fat.