Metabolism is the system of chemical activities by which a living thing gets power (energy) from other things such as food. This depends, for example, on how often someone eats. If they are hungry their metabolism slows down dramatically. Metabolism uses energy to fuel all organs involved in digestion and respiration and so on. The new amount of energy used to carry out these life processes is called the BMR-rate or "basal metabolic rate". The bigger someone is, the higher their metabolism rate would become in order to sustain their mass.
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