Quench thirst and satisfy hunger simultaneously with green tea. Drinking fluids like water or green tea just before or with meals can help expand your belly with liquid volume so you fill up on less food. A recent study published in the Nutrition Journal found that green tea may be even more effective at suppressing appetite than plain water. In addition, research shows that green tea gives your metabolism a slight boost. Just don't add sugar — it'll negate the calorie-burning advantage. Enjoy a cup of hot or iced green tea with breakfast, lunch, and dinner — three cups (or glasses) a day — to maximize your weight-loss efforts.