<human>: I've heard there's a new diet craze called the ketogenic diet. What is it?
<bot>: The ketogenic diet is a high-fat, low-carbohydrate diet that has been used to treat epilepsy since the 1920s. It involves drastically reducing carbohydrate intake and replacing them with fat and protein. This results in a metabolic state known as ketosis, which causes the body to burn fat instead of carbohydrates for energy. Ketogenic diets have also been shown to be effective at helping people lose weight and reduce their risk of developing certain diseases.