Hahhaha, no one wants to argue about a bodybuilder about nutrition.
Bloodrage was right, the fastest way to dropping weight is not cardio or aerobics at all, it's to increase your lean muscle mass through resistance training.
Not only does a hard lifting session burn an incredible amount of calories, increased muscle mass speeds up your metabolism big time, during ALL hours of the day, even when sleeping. Your body is working that much harder to maintain it's incresed muscle mass, and it's you're burning calories at a much faster rate because of this.
That is why lifters need to take in so many extra calories, often 3-5 times the normal daily recommendations you see on the labels of food.
Eating 3 big square meals a day is dumb as well. A lifter needs new nutrients introduced almost roughly every 3 hours. If you give your body long lapses between food intakes, it has more of a tendency to "store up" what you consumed as fat, like a bear hibernating until its next meal. If your body is constantly recieving the calories it's new boosted metabolism calls for, it has less of a need to try to store up fat.
Try to shrink the amount of food you eat to about the size of your fist, but eat it now 6 to 7 times during the day, roughly every 3 or so hours. Obviously you want to be eating lean proteins like chicken and tuna, but as long as you are working out regularly, you don't have to be so anal about carbs. Cutting carbs causes you to lack the energy you need to get a good workout in.
You do not have to be nearly so anal about every last little ingrediant in your food as Bloodrage suggests, only competitive bodybuilders are like that. I have had success with bodybuilding and been able to keep the weight down all the while eating much more "impulsively" than the typical bodybuilder. How anal (as i like to call it) you get about your foods depends on how far you want to go in lifting.
Try to eat at least your bodyweigt in grams of protien for sure. Deli sandwhiches are great ways to get protien, just start buying more lunchmeat. Some people here bashed supplements, but it's going to be damn hard to hit your bodyweight in protien without doing a whey protien supplement at least once a day after you lift. I usually do one in the morning as well, so two times a day.
Obviously don't eat stuff with a lot of fat or sugar. So cut the fucking fast food, soda and junk out of your diet right now, stop eating for pleasure, go beat off or something instead if you have to. You most likely know what healthy food is, just eat that but MAKE SURE you are taking in enough protien, shrinking the size of your meals, and eating roughly every 3 hours or so.
Problem solved.