Before we answer those questions, it’s important to understand how fuel (carbs, fat and protein) is transformed into energy and in which cases they are stored as fuel. To be used by our cells, the different types of fuel must go through several stages of transformation to become the one and only form of  “usable” energy: adenosine triphosphate — more commonly referred to as ATP. ATP is the universal energy currency for many living organisms from mammals to insects and fungus to plants.

Belly fat is is different from fat elsewhere in your body. The extra weight some people carry around their waists, arms, and love handles isn’t the same — that’s subcutaneous fat, which sits beneath the skin and is relatively harmless, according to Harvard Medical School. The stuff in your belly, visceral fat, lodges deeper down, around your abdominal organs. It's metabolically active tissue that actually functions like a separate organ, releasing substances into the rest of your body that, in excess, can increase your risk of disease.
Seriously: Your flab can help you shed pounds. How? Just as there's more than one kind of fat in food, there's more than one type in your body. White fat is the bad stuff you want to zap. But a second kind, brown fat, actually torches calories. "Up to 80 percent of adults have brown fat deposits in their bodies," says Aaron M. Cypess, MD, PhD, an assistant professor of medicine at the Joslin Diabetes Center and Harvard Medical School. This good fat is powerful because it's packed with mitochondria, the parts of cells that generate heat. When activated, as little as two ounces of brown fat can gobble up as much as 20 percent of your body's calories.
You're more likely to stay slim if the view out your window includes hills, water, a park, or a street that leads to one of those things. In a North Carolina study, counties with more natural amenities, including mountains and lakes, had lower obesity rates. "It could be that there's something healing and calming about simply being outside," says Stephanie Jilcott Pitts, PhD, an assistant professor at East Carolina University. For instance, research has shown that people tend to be happier walking outdoors than inside. They also stride faster, yet feel less exertion, than they do on a treadmill. Not only that, hoofing it outside curbs cravings along with calories: In a study, regular chocolate eaters who took a brisk 15-minute stroll consumed about half as much of their favorite treat as those who didn't go for a walk. So take your workout outdoors. If your neighborhood isn't made for exercising, find a park nearby and head there as often as you can to bike, run, or hike.
One study from the University of Adelaide in Australia suggests you may lose more weight when you work out towards the end of your menstrual cycle, as opposed to right when a new one begins. That’s because the hormones estrogen and progesterone tell your body to use fat as an energy source. "Women burned about 30 percent more fat for the two weeks following ovulation to about two days before menstruation," study author Leanne Redman says.

“Most people who have been lean their whole lives have a much better understanding of proper portion size than people who are overweight,” says Deborah Riebe, Ph.D., a professor in the department of kinesiology at the University of Rhode Island. “If they go out to eat, they’re much more likely to ask for a doggie bag right away or to leave food on their plate rather than cleaning it up.”

To lose weight fast and keep it off, you must adopt a healthy lifestyle that involves making healthier food choices and keeping yourself physically active on a daily basis. As quick fixes to their weight problem, some people opt for yo-yo dieting, which can be harmful to the health. Yo-yo dieting, also known as ‘weight cycling’, is also believed to be ineffective because most dieters gain back more weight than they lost. Yet, if you’re struggling to lose weight, it may be that you’re doing it the wrong way. These 5 simple tips can help you shed the excess flab and keep you on the right track to reach your goals. Read - Weight loss: Include these 5 Ayurvedic medicines in your diet to lose weight and get a flat tummy
A number of athletes told us that they don't abandon heavy free-weight workouts when trying to get cut. "I've lifted weights for over 10 years," says Louisville personal trainer Lindsay Cappotelli, "and I've found that heavy weights lifted for 5-8 reps with a focus on big lifts like the squat, deadlift, and bench press has worked best for me. You always hear, 'Train with light weights for high reps to burn fat,' but I've found the opposite to be true."
While there may be no scientific studies showing it’s the ultimate fat burner, water will help fill you up more – something that staves off hunger and stops you overeating. A good trick is to drink one or two glasses of water 10 minutes before you eat a meal – especially if you’re out at a restaurant – this will help with dietary adherence and stop you over-eating. We advise clients to try and drink a litre of water per 25kg of bodyweight every single day.
Successfully flattening your stomach is a matter of burning body fat and building muscle. The best way to burn body fat is through cardio exercises such as running, walking, elliptical training, and bicycling. With these exercises, burning stomach fat, shedding love handles, and building a six pack is completely do-able. So send your body the memo: flat abs are in style and it’s time to get yours!
"Been there, done that" may explain your attitude toward not-so-new endeavors like movie reruns and mohawk haircuts, but few of us have ever "been there, done that" when it comes to achieving single-digit body fat levels. Dropping fat to stage-ready percentages is no easy feat, and a hardcore cut usually ends up burning as much motivation and strength as it does fat. https://www.youtube.com/watch?v=rdTJx8IDG0Q
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