While probiotics encourage the growth of good bacteria, prebiotics feed the ones you already have. When you eat prebiotic foods like onions and leeks, they produce butyrate, a metabolic wonder drug that improves insulin sensitivity and increases the amount of fat you burn, says Rafael Kellman, M.D., author of The Microbiome Diet. Now that it's summer, pop either on the grill to bring out their sweetness. Drizzle with olive oil, salt, and pepper and cook until golden.
Belly fat also responds to a lower-calorie diet that's full of healthy, unprocessed foods. Go for lean protein, fresh produce and whole grains at meals. When you have just a week to lose as much as possible, ban all sweetened drinks -- including soda and juice -- bakery treats and ice cream. Also avoid refined grains, such as pizza and white bread, as well as alcohol. Keep your portion sizes to just 2 to 4 ounces for meats and other proteins and about 1/2 cup for grains. Over the long term, these dietary revisions help you drop belly fat.
Luckily, exercise can help spur things along when it comes to that pesky stomach fat. “Visceral fat responds well when… [you] start exercising and watching your calories and what you eat,” Harris-Pincus says. And while endless crunches aren’t your ticket to a flat stomach, it is still important to train your ab muscles. “Everything radiates from the center of your body – your balance, your posture, your functional movement,” says Joe Ardito, founder of Fit Crush NYC. “You can perform better when you have a strong core.”
If antioxidants are the good guys of gut health, trans fats are the supervillains. These sneaky fats actively contribute to your wobbly waist – not just by adding new fat, but by moving fat from other areas of your body to your belly. During a six-year study at Wake Forest University, monkeys that were fed an 8 per cent trans fat diet had 33 per cent more belly fat than monkeys that were fed an 8 per cent monounsaturated fat diet.
Bring on the heat! "Spicy chili peppers contain capsaicin, a compound known to increase satiety and decrease caloric consumption," says Hever. "It also helps encourage fat burning. Enjoy capsaicin by sprinkling ground cayenne or chili pepper over food or in beverages such as tea or lemon water, or cook hot peppers into stews, chilis, and soups." Or, you know, pop raw ones straight. If you're really brave!
“Include lots of nutrient-rich vegetables, a source of protein and some healthy, unprocessed carbs,” says Belalij. “Start with leafy greens such as spinach, kale and collard greens, then add carrots, broccoli and peas. Lean meats, including turkey and chicken, are ideal as they are lower in fat and therefore calories, or, if you are vegetarian/vegan, add in tofu or a handful of nuts such as pine, cashew or almonds and a sprinkling of seeds (sunflower, sesame, pumpkin). When it comes to carbohydrates, rice, quinoa and potatoes are perfect.”