What's the strongest belly fat diet in the world? It's calorie shifting. Not only does this dieting technique help you in losing weight, but it also get rid of the fat stored in your body and especially in the belly. This dieting technique is said to be the most powerful belly fat diet because it triggers a reflex in your body and leads it to burn metabolism and increase fat burning fantastically. This is also a natural reaction which means it is totally safe and anyone can use it.