When we're not eating, our metabolism is naturally switching into fuel burning because insulin is low. The longer we give our body time to burn without food, the more fat it will be able to suck in and shrink those fat cells. Intermittent fasting isn't a fad or some crazy new kick that people should get on. It's actually very, very natural to our body. We were all conditioned this way: Get up, eat breakfast, hurry up, catch the school bus and get off to school.