Belly fat in essence is no different to the fat anywhere else on the body except that once it starts to build up around the internal organs (any and all of them) it hampers those organs from functioning efficiently - and eventually if we do nowt about it - at all! On the assumption that most of us usually do wish to stay alive - then we have to fully understand why the NHS doesn't like any of us to be overweight.
The first thing is to try and lose whatever excess weight/fat that we happen to have and diet is a very important part of this. What advice have you already had about your diet and how have you changed your diet so far, to attempt to do this?