I was 300 lbs and now down to 225 with abs starting to show ;P
The most important thing besides eating healither is to TRAIN your body to not want the food that is bad for you. I ate so much crap for so long and I though I would not be able to do without those foods, Metabolife started it for me, then Stacker .. I didn't work out with them but I took them religiously and started to eat healthier, and after a while, my body didn't crave the bad stuff, the hamburgers, greasy fries, etc.
Find a better way to cook, acquire tastes for healthy natural things, drink lots of water, you'd be surprised how less hungry you feel drinking lots of water.
What also will help at the beginning, get some carb or sugar / fat blockers ( w/ chitosan ) I know I know that they are not as effective as they state they are ( unless in very large doses of chitosan ) /w Absorbic acid ( Vit C) having some of the fat blocked is better than having none of it blocked.