Exercise+giving up pop/juice will really help with belly flab.
I don't drink
any juice (save for maybe orange juice every now and then when I'm not feeling too well), I have maybe a can of Sprite Zero with lunch (no caffeine, no sodium, no carbs, etc.) and drink moderately (a beer every now and then).
I cut out a lot of processed foods from my diet, which is not perfect, but a far cry from what I used to eat.
After this regimen on the elliptical, and I get my endurance up, I'll start going to the gym. That's the goal.