Speeding up your metabolism is the holy grail of weight loss. But how quick your body burns calories depends upon several things:

Strength training
The metabolic rate is higher in people with more muscle. Every pound of muscle uses 6 calories a day, while each pound of fat burns about 2 calories daily. Which is why men burn more calories than women.

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If you gain a lot of weight, the body starts to store your fat in unusual places. When the regular areas to store fat are full, the fat is deposited into the organs and around the heart. If you've too much belly fat, you might be more likely to get high BP, dementia, cardiovascular disease, type 2 diabetes, and certain cancers.

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