Most of the foods I eat, I consider "free" foods. Eat all you want whenever you want. Find a raw vegetable you like, and a salad dressing (with no sugar in it) that you also like. I eat raw broccoli dipped in caeser or blue cheese. Any high fiber food, like beans and lentils, is also free. You'll feel like you stuffed yourself, but you won't be hungry again for a long time.
The fewer carbs you eat, the faster the weight will come off. Brown rice has fiber, which makes it better than white, but if you are really concerned about dropping fat quickly, closely scrutinize your carb intake and cut it as much as possible. Healthy fats and fiber are the way to go.