There are numerous things that have an impact on your speed of metabolism.

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Another simple tip on how to speed up metabolism is to understand the impact of body composition on metabolism. Your muscle mass and fat composition is a significant determinant of your speed of metabolism.

Muscle uses more calories to maintain itself than fat and therefore generates a higher speed of metabolism. A great way how to speed up metabolism is to increase your muscle mass.

A person who has a higher proportion of muscle to fat (lower body fat percentage), all else being equal is likely to have a higher rate of metabolism.

In simple terms; increase your muscle mass and you will speed up your metabolism.
The most effective method of increasing muscle mass is to undertake some form of regular physical activity that involves resistance training such as weight training.

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