Research is under way to see if this diet can ameliorate symptoms of other neurological disorders like Alzheimer's disease and mental health conditions like depression, schizophrenia and bipolar disorder. All diets have some sort of premise, and in the case of the keto diet, the premise is that if you can teach your body to use fats, instead of sugars, for energy, it will help you lose more weight faster. In this way, a keto diet is essentially mimicking what happens to our bodies when we fast. The keto diet craze is the latest diet hype, but it isn’t a new diet. The ketogenic diet originated as a treatment for epilepsy in the 1920s.