Muscle is typically more dense than fat and uses more energy as a result. The National Health Service (NHS) in the UK states that those who have a higher muscle to fat ratio tend to have a higher BMR because of the fact it requires more energy to maintain. For every pound of muscle, the body burns 50 calories to maintain a person's BMR. Exercising to build muscle will help boost your metabolism as you get your body in shape.
Boosting metabolism is the holy grail of weight watchers everywhere, but how fast your body burns calories depends on several things. Some people inherit a speedy metabolism. Men tend to burn more calories than women, even while resting. And for most people, metabolism slows steadily after age 40. Although you can't control your age, gender, or genetics, there are other ways to improve your metabolism. Here are 10 of them.
Muscle burns more calories than fat. So will building more muscle not boost your metabolism? Yes, but only by a small amount. Most regular exercisers only gain a few pounds (kilograms) of muscle. That is not enough to make a big difference in the number of calories you burn. Plus, when not in active use, muscles burn very few calories. Most of the time, your brain, heart, kidneys, liver, and lungs account for most of your metabolism.
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Tea, often used in many diet fads is scientifically proven to boost your metabolism while trimming your waist line. In a study published in the Journal of Medicine Investigation, researchers tested the effects of oolong tea on energy metabolism in 11 healthy Japanese females who either consumed water, oolong tea, or green tea. In comparison to water and green tea, oolong tea increased energy metabolism by 10 percent which increases the overall metabolic rate. The polyphenols — compounds found in tea — are said to be responsible for the enhancement of the females' metabolism.

“Hormones dictate how our body utilizes the energy we give it,” says nutritionist Lisa Jubilee. “Between our reproductive, thyroid and growth hormones, appetite, insulin, and hunger hormone leptin and ghrelin, our bodies have to perform a tricky balancing act to keep us lean, energized and viable reproductive beings.” Those tasks have become much more difficult because of the hormone residues we consume via cage-raised foods. If you want to give your metabolism a leg up, Jubilee says, switch to organic, grass-fed, pasture-raised beef, eggs, and dairy products, thereby avoiding those nasty hormones at mealtime.
Cardio improves definition and burns the fat that covers your muscles, especially belly fat. Combining regular aerobic exercise with strength training will give you the slimming effect you've been going for. After all, toning without cardio is like building a house on a weak foundation. Blast calories with these 20-minute cardio workouts from celebrity trainer Jackie Warner.
Even when you’re at rest, your body is constantly burning calories. In fact, 75 percent of the calories that you burn each day are being used up just keeping you alive. “Resting metabolic rate” is much higher in people with more muscle, because every pound of muscle uses about 6 calories a day just to sustain itself. If you can pack on just five pounds of muscle and sustain it, you’ll burn the caloric equivalent of three pounds of fat over the course of a year.
Studies conducted at The Nutrition Institute at the University of Tennessee suggest that consuming dairy may help your body metabolize fat more efficiently. Other studies have shown that increased calcium intake from dairy products (though not from supplemental calcium carbonate) caused study participants to poop out more fat as opposed to it sticking around on the body.
Bodybuilders have long sworn by eating every few hours to keep their muscles fueled, but don’t discount the weight loss potential of three squares a day. A study in the journal Hepatology put two groups of men on weight-gain diets. One group divided the calories among three small meals with snacks in between while the second group ate the same number of calories in three square meals. While both groups gained weight, researchers found that belly fat—the dangerous kind that increases heart-disease risk—only increased in the high-meal frequency group.

Weight loss doesn’t get easier than this: Simply drinking more water may increase the rate at which healthy people burn calories, according to a study in The Journal of Clinical Endocrinology and Metabolism. After drinking approximately 17 ounces of water (about 2 tall glasses), participants’ metabolic rates increased by 30 percent. The researchers estimate that increasing water intake by 1.5 liters a day (about 6 cups) would burn an extra 17,400 calories over the course of the year—a weight loss of approximately five pounds! 
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