In that age range, girls are just hitting puberty. It is a period of faster growth than any other time in their lives since infancy. Limiting calories is therefore not a good idea for girls in that age group, since their bodies need extra energy in order to grow, unless they are having health problems due to weight. Making healthy dietary choices and getting plenty of exercise are good ideas. Just keep in mind - the belly fat that many girls accumulate early in puberty tends to move elsewhere in their later teens.

Having good posture doesn't just make you look more confident — it's also a great way to flatten your tummy. Whether you're sitting at your desk at work or taking your dog on a walk, Harvard Medical School says good posture trims your figure, building up your core almost effortlessly and helping you get rid of belly fat as you go about your daily routine.

If you're one of the 32 percent of Americans who want to lose belly fat for good, but have no idea what actually works anymore, you're not alone. A recent survey found that 76 percent of people didn't follow a diet or workout plan last year because, well, there seems to be a fad diet popping up every day and nobody knows what's what. So let's cut through the clutter — these are the 23 out-of-the-box strategies that are guaranteed to give you results. Pick the ones that work best for your lifestyle and say hello to your skinny jeans once more.


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.
“Under normal conditions, humans absorb only about 80% of the nutrients from the food they eat,” says A. Roberto Frisancho, Ph.D., a weight-loss researcher at the University of Michigan. But, he says, when the body is deprived of nourishment, it becomes a super-efficient machine, pulling what nutrients it can from whatever food is consumed. Start eating again normally and your body may not catch up; instead it will continue to store food as fat.
Grains get a bad rap when it comes to weight loss, but that's because refined grains (read: processed foods!) are linked to wider waists. 100% whole grains are bloat-busting superstars, however, as they're packed with minerals and de-puff by counter-balancing salt. Stick to brown rice, quinoa, wheat, barley, millet, farro, sorghum, and amaranth for the biggest benefits.
Which means, sadly, the more glasses of rose and chocolate-coated pretzels you eat, the longer it will take to reach your flatter belly goals. “When you digest large amounts of calories, your body allocates some of these to functional systems which work to keep you alive (think the brain, muscles and organs),” says Belalij. “It also uses it to fill up energy stores. Any excess is then stored in fat cells around the body – typically being those of the belly.”
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