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Body size and composition

  If you are overweight or have more muscle mass, you will burn more calories at rest.  So for people who are overweight, the fast metabolic rate is not very low, because a portion of the excess weight is muscle tissue.
  If you are a man, your body fat and muscle mass are lower than a woman of the same age, so you burn more calories.
  As you age, your muscles decrease, which slows you down in calorie burn.  Breeding  Genetics also plays a role in whether you have slow or fast metabolism, and some genetic disorders can also affect your metabolism.
  Simple food
  Certain aspects of your diet can also affect metabolism.  For example, if you do not have enough iodine for optimal thyroid function, it may slow down your metabolism.
  Muscle mass
  The muscle needs more energy than the fat.  So the more muscle tissue you carry, the more your body just needs to exist.  (Although most exercises will help with muscle growth, resistance or strength training is most effective))
  Environmental factors
  Weather can also affect your metabolism;  If it is too cold or too hot, your body needs to work harder to maintain the normal temperature and it increases the rate of metabolism.
  Of drugs
  Caffeine and nicotine can increase your metabolism rate, but some antidepressants and ation medications, including anabolic steroids, can contribute to weight gain regardless of your diet.
  Hormonal causes
  Hormonal imbalances can affect your metabolism due to certain conditions, including hypo- and hyperthyroidism.
  Physical activity
  Regular exercise increases muscle mass and encourages your body to burn kilos at a faster rate while at rest.
  Weight gain
  This speeds up the metabolism because moving each movement requires more muscle contraction to move mass, even as the weight gain is fat.  However, fat is not active in metabolism, so the metabolic rate will be higher during metabolism.
  Mental state
  Stress and anxiety can quickly increase energy expenditure.  When a person is called on the edge or in a nervous state they are in high alert, various hormones promote blood vessels and communicate to cells to break down energy stores ready to supply more if needed.
  If we are too cool, we tremble which burns a lot of energy from the transparent contraction and relaxation of muscle cells that slowly try to produce heat to maintain body temperature.  When we are hot we process more calories by sweating.  When you train or exercise hard, at a fast pace, you naturally raise your body temperature.

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