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.
Another win for your morning cup of joe: Caffeinated coffee keeps things moving through the digestive tract. Since staying regular is key to a tighter-looking tummy, drinking about 8 to 16 ounces of java at the same time every day can help you stay on schedule. Remember: Sugary drinks can lead to weight gain, so skip fancy flavorings and synthetic sweeteners containing sugar alcohols, which can cause bloating.
The options for spin today are growing to be more intense and more entertaining at that, with options like SoulCycle, Flywheel, CYC fitness, and your local gym’s trusty spin class. Locking into a bike will not only skyrocket your fat burn, but the pack mentality may cause you to work harder in an effort to keep up with and surpass your fellow riders. “I definitely would put spinning up there as one of the best fat-burning workouts. First of all, you have that great social scene and music coming together [to boost drive and motivation]. Weight training can sometimes be boring alone, but adding spinning makes things more interesting,” says White. Researchers at the University of Southern California’s Department of Preventive Medicine found that when you work out with others, you’re more likely to enjoy your sweat session. When you enjoy something, you’re more likely to stick to it long-term. It’s a simple concept, but when it comes to losing belly fat it’s particularly important because fat loss is a marathon, not a sprint.

If you're among the 30% of Americans who sleep less than six hours a night, here's one simple way to whittle your waistline: catch more Zs. A 16-year study of almost 70,000 women found that those who slept five hours or less a night were 30% more likely to gain 30 or more pounds than those who slept 7 hours. The National Institutes of Health suggest adults sleep seven to eight hours a night.


2. Boxing: I let my clients do boxing as I feel that it’s a great way to pump up your heart rate and increase sweating. Higher the heart rate the more calories they’ll be burning. Usually I instruct my clients to do one minute of punches or combinations usually on boxing pads but can also be done on a punch bag followed by 30 seconds rest. Usually I repeat this exercise several times until my clients are fit. Then I let them hold the plank in between rounds as an active rest.


High-intensity interval training is high on every trainer’s list, and for good reason. “My No.1 pick for fat loss would be high-intensity interval training, just because you’re burning a lot of calories in a short amount of time. You’re getting more bang for your buck. I know a lot of guys that don’t have all day to work out in a gym, so when it comes to belly fat you have to focus on calorie burn and intense workouts,” says Jim White, owner of Jim White Fitness and Nutrition Studios in Virginia Beach. Think bootcamps, tabata, and series of burpees, box jumps, and sprints—those all do the trick. The best thing about HIIT is that it keeps your body working long after you leave the gym, burning calories and fat on your off hours via a phenomenon called excess post-exercise oxygen consumption, aka EPOC.


"This is where it's called visceral fat, which is in and around our organs -- whereas the fat present all over our body under our skin is subcutaneous fat. When there's high amounts of visceral fat, it increases the risk of developing those diseases like metabolic syndrome and heart disease. Being aware of, and managing, this is incredibly important."


You know you're supposed to eat more protein to lose weight, but you might not know exactly why. Well, it actually has to do with how your body handles insulin. "Your body starts to produce more insulin as you age, since your muscle and fat cells aren't responding to it properly," explains Louis Aronne, M.D., director of the obesity clinic at Cornell University.
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