Avoid pastas, nuts, and sauces. A big mistake I see people make is that they will eat a nice, healthy salad with some baked (not fried) chicken on the top, and ruin it completely by saturating it with dressing.
Keep in mind the choice - you can have 1 extra cup of caesar dressing on your salad OR half of a glazed donut for the same value. Or you can skip it alltogether and drizzle a little bit of lemon and some pepper over the top with the tiniest bit of an olive oil.
Also, when thinking about fruits, look at the sugar value. Bananas are better than grapes, etc. Apples are great, too.