How do I lose my incipient belly fat?

I’ve noticed my belly fat has been slowly growing in the past 2 months. Now its beginning to be very noticeable. How do I get rid of it?

Getting rid of it naturally, of course. I dont want to take those weird vitamin supplements nor those strange diets.
I’ve been just doing situps. But will mere exercise work? Should i run more? I dont drink sodas very often (less than once a month), but eat cookies as snacks…. Change my diet? (obviously cut down on the sweets….but what else? is there some specific food that I shouldnt eat?)