Whenever it comes to flatten your belly, then everyone recommends we do sit-ups. But do you know, even after performing 100 sit-ups and crunches, your belly fat won’t burn? The reason behind it is that along with sit-ups and crunches, we need to make disciplined dietary choices to experience noticeable transformations in your body. Diet and nutrition play a key role in reducing your belly fat and body weight. The only way to lose belly fat is to reduce the whole body weight.