The simple boost in metabolism will help you burn waistline fat more efficiently. Try to squeeze in a 30-minute walk daily, says Lyons. (Look for versions that contain the strains acidophilus and bifidobacterium, and are produced by reputable vitamin companies.) To ensure your plumbing is working at optimum capacity, Bowden suggests eating a daily serving of a probiotic-rich food like yogurt (or drinking a glass of buttermilk), or taking a supplement containing at least 50 milligrams of probiotics. 'Probiotics are 'good' bacteria that help your digestive system break down food, preventing the gastrointestinal issues that can keep you from having a flat stomach,' explains nutritionist Jonny Bowden, Ph.D., author of The Most Effective Natural Cures on Earth. Plus, when you eat fast, you're more prone to swallowing air, which can ratchet up your risk of developing a potbelly. 'The body has to work overtime to break down food in the stomach and intestines, which can lead to major gas and indigestion,' Dr. Rather than scarfing down meals, make a point of chewing each bite at least 10 times before swallowing. If you don't, it's too easy to give in to feeling rushed, and ignore the urge to go.' Once you've trained your brain to dismiss your body's signals, you set the stage for bloat-inducing constipation. 'Most women don't want to talk about it, but you really have to set aside a specific time each day to use the bathroom,' notes Judith Reichman, M.D., a professor of obstetrics and gynecology at the University of California, Los Angeles.

Try for at least six 200ml glasses of water or other fluids daily.

'Being dehydrated causes the body to hoard water,' says Lyons, which can lead you to carry up to four excess pounds around your midsection. 'When your posture is good, you're automatically engaging and toning your stomach muscles.' If you need to remind yourself to stand tall, she says, a few strategically placed Post-it Notes should do the trick. 'Straighten up,' advises The Biggest Loser trainer Kim Lyons, and your figure will look better.

How to get flat stomach in 3 days