"The US military has been looking at changing the diets of elite operators like Navy SEALs as new evidence emerges that their diet could enhance their abilities on the battlefield, especially underwater. … The ketogenic, or keto, diet, is high in protein and fat and very low in carbohydrates. The diet forces the body to go into ketosis, in which the body burns stored fat, or ketone bodies, as energy instead of blood sugar, which comes from carbohydrates. Research shows the ketogenic diet can help human bodies stay underwater for longer periods of time."