Metabolism, is the process of transforming food (e.g. nutrients) into fuel
(e.g. energy).

If you had no metabolism – that is, if you had no metabolic process that was converting food
into energy – then you wouldn’t be able to move.
The basic building blocks of maintaining your life – circulating blood,
transforming oxygen into carbon dioxide, expelling potentially lethal wastes through the
kidneys and so on – all of these depend on metabolism.
It’s also interesting to note that, while we conveniently refer to the metabolic process as if it
were a single function, it’s really a …

Metabolism is the set of chemical reactions that occur in living organisms in order to maintain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is usually divided into two categories. Catabolism breaks down organic matter, for example to harvest energy in cellular respiration. Anabolism, on the other hand, uses energy to construct components of cells such as proteins and nucleic acids. In short the burning of certain amount of energy (calories) by your body to maintain itself is called metabolism. …