I heard a number of unconfirmed rumours for loosing belly fat let me list a few :-

1.) Drinking Green Tea.

2.) Drinking Lime water.

3.) Eating Salad as Meal in Breakfast and Dinner.

4.) Sleep for atleast 8 Hrs.

5.) Walking for a Fixed Duration i.e. till you sweat.

6.) Doing Crunches when you get up from the bed in the morning.

I say unconfirmed cause i tried none of them. My belly fat is here to stay..