what Phaseman said! You definitely have to "eat better". Cut out the partially hydrogenated crap and high fructose corn syrup. Cut down on the sugar and drink tons of water.
You have to get *some* exercise in too though - building muscle will raise your metabolism (don't need to go all Arnold - just get in better shape).
Give P90X a shot (yeah, the one on the infomercial). The wife and I did it 6 mos ago and it really does work. I'm 40(ish), 6' and I went from 186lbs to 160lbs - 36" waist to 32/33" - and 25% body fat to 17% - all in less than 90 days. And I *hate* exercising!
p90x[dot]com
p.s. i'm on my way out the door to pick up a pepperoni / tomato slice pizza... ya gotta splurge a lil! Good luck w/ the gut!
