From an article in Prevention - read it, it's fascinating! Foods high in monounsaturated fat (MUFA) actually help you lose belly fat.
1. Nuts and seeds - macadamia nuts contain the highest level.
2. Oils - Olive and canola are good, safflower has the most MUFA
3. Avocado - denser Hass variety packs twice as much as the bright green-skinned FL varieties
4. Chocolate - dark and semisweet are MUFA rich and high in antioxidants
5. Olives - green ones offer more belly-fat-fighting fat than black ones