To trim belly fat, be smart about your diet -- eat sensible portions, lots of veggies, and little junk food. And instead of soda, consider green tea. A few studies have suggested that catechins, antioxidants found in green tea, might help (a little) to burn visceral fat. The results are far from certain. But one thing is clear: Subbing tea for sugary drinks will save calories. Just don't load it up with honey or sugar.