Fast Food
If you can purchase it through a drive through window, you probably shouldn't be eating it. Most fast foods are high in fats, and those will go straight to your belly
Processed Foods
While it's almost impossible to avoid all processed foods, you should try to limit them in your diet. Take a look at the labels next time you consider a can of soup or a frozen, prepared meal. Among other things such as the fat and sugar, notice the high levels of sodium which can cause you to retain water.
Fried Foods
Not only does fried food get dunked in fatty oils, but the breading also contains carbohydrates that could be converted to fat. Fried foods can clog your arteries and expand your belly.
Beer
Drinking too many carb-loaded beers definitely keeps your belly pudgy. To lose that beer gut, cut back or consider switching to light beers.
Soda
Full-sugar sodas have loads of empty calories. Drink plenty of water or tea throughout the day instead.
Considerations
Remember the old saying, "all things in moderation." Cutting out everything might prove difficult. It's OK to reward yourself every now and then. Try to choose grilled alternatives, blot the grease and keep your beer light.