What Factors Affect Metabolic Rate?

Multiple factors affect metabolic rate, or the number of calories you burn. Check out the top determining factors below:

  • Age: The older you get, the slower your metabolic rate becomes. This is one of the reasons people tend to gain weight as they age.
  • Muscle mass: The greater your muscle mass, the more calories you burn.
  • Body size: The bigger you are, the more calories you burn.
  • Environmental temperature: When your body is exposed to cold, it needs to burn more calories to prevent your body temperature from falling.
  • Physical activity: All body movements require calories. The more active you are, the more calories you’ll burn. Your metabolism will speed up accordingly.
  • Hormone disorders: Cushing’s syndrome and hypothyroidism slow down metabolic rate and increase the risk of weight gain.

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