Revive Keto occurs when the body is denied access to glucose, its main fuel source. The goal is to force the body to derive its fuel from fat, rather than carbs. Cutting carbs from your diet means less glucose for your body to burn up. Foods high in carbohydrates produce glucose and insulin, which can cause energy spikes and hunger soon after the carbohydrates are consumed and processed by your body. Revive Keto and Low Carb/High Fat (LCHF) Diets. The Nutrisystem Diet’s arrival on the scene to claim Revive Keto as much as 5 pounds in a week while improving the health of the body is too good to be true.