Suspect you have a sluggish metabolism? You might have hypothyroidism, or an underactive thyroid gland, which afflicts about 25 percent of American women — many of whom don't know they have the condition, according to the American Association of Clinical Endocrinologists. "The thyroid gland controls your body's metabolism, so one of the first signs that it may be off is an inability to lose weight," explains Pamela Peeke, M.D., professor of medicine at the University of Maryland and author of Fight Fat After Forty. Your doctor can determine if you're suffering from hypothyroidism by running a blood test. If you do have an underactive thyroid, you'll be treated with a synthetic thyroid supplement, which you will need to take for the rest of your life (it will return your metabolism to normal, so it should be easier to drop unwanted pounds).
It is one of the biggest myths that doing only crunches help reduce waistline. Crunches are essential, however, they only strengthen the core muscles and build endurance. To lose fat around the waist, it is very important to combine high-intensity interval training (HIIT) moves along with crunches to get magnum results. Start with cardio moves like skipping, jumping jacks, burpee and hand walk.
A diet that’s low in fat and carbohydrates can improve artery function, according to a 2012 study by Johns Hopkins researchers. After six months, those on the low-carb diet had lost more weight, and at a faster pace. But in both groups, when weight was lost—and especially when belly fat shrank—the arteries were able to expand better, allowing blood to travel more freely. The study shows that you don’t have to cut out all dietary fat to shrink belly fat. For heart health, simply losing weight and exercising seems to be key. 
However, due to the intense exercise, the total calorie consumption is higher. We burn more calories due to the hard muscle work – even AFTER the run. The body needs more energy for recovery, thereby burning even more calories. That’s how you benefit from post-workout fat burning and the afterburn effect (EPOC, excess post-exercise oxygen consumption).
1. Start keeping a food journal. Today 90% of the population uses some version of a smart phone that gives us the opportunity to download various apps. Two food apps that I recommend playing around with are “lose it” or “my fitness pal.”As we have all heard a million times “Abs are made in the kitchen, not in the gym.” Becoming aware of what you are putting in your body throughout the day is your first step at creating a long lasting program that will help you trim down your waist and start losing weight on the scale.
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While eating carbohydrates early in the day provides us with the energy needed to power through training sessions and complete our daily tasks, and the evening meal containing them helps us to replace lost glycogen from our final workout for the day, consuming carbohydrates after 6:00pm (or around this period) will only lead to an unnecessary output of insulin, an anabolic hormone responsible for, among other functions, increasing fat storage.

"Only doing abdominal-focused workouts, like crunches, won’t help you banish the bulge. Belly fat is simply where your body stores energy, so you need to take a whole-body approach to tackle it. HIIT training (high intensity interval training) is a great way to burn fat and get your heart rate up. Squats, burpees and treadmill sprints are all examples to try." https://www.youtube.com/watch?v=eXyOlGTT9QE
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