There are
7 tips to speed up your metabolism. Calories do count, but it's also about how efficiently your body burns those calories. Your metabolism plays a big part in regulating your weight. Metabolism is the way your body uses up calories from the food you eat and turns them into energy.
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it's primarily to do with
it's primarily to do with hormones and hormonal change, also the sun has a lot to do with hair's color change.