What a Keto Diet is high in is FATS, which stands for 'Fatty Acids'. A Keto Diet is a high-fat, low-carbohydrate diet that has been used to treat certain medical conditions such as epilepsy and diabetes. It is also used by some people to lose weight. Fats are an important part of the Keto Diet, as they provide energy and help to keep you feeling full. Fats also help to regulate hormones and provide essential fatty acids that the body needs.