Most of us think crunches are the best way to lose belly fat. Let me bust that myth for you. Research done at the University of Virginia in the US has proven that if you want to lose 1 pound( roughly half a kg) of belly fat you need to do 250,000 crunches. Now that works out to 100 crunches a day for 7 years. So …..what should one do? Here’s what you need to do to lose your belly fat. Work the full body. Yes, that’s right. Do it and see the difference. Crunches will help you tone your belly muscles, but an overall body workout will help dissolve belly fat.