Express Diet 5-day diet protein 20 servingsThe 5 day Express Diet is a ketose based protein ketone diet, a rapid fat burning without hunger. Detailed product information The principle of weight loss with a 5 day ketogenic diet Express Diet When losing weight with a 5 day EXPRESS DIET diet, high quality natural proteins are delivered to the body while reducing carbohydrate, fat and energy supplies below 850 kcal per day. Usually carbohydrates are the primary source of energy for the body.