METABOLISM

The last photo is the Scribe Valdemir Mota de Menezes ( brown dress) when he was thin and young, as they grew older, the body was already a different metabolism.
metabolism is "all the chemical phenomena which transform matter into energy in a living being." Aurelius is perhaps the clearest; "set of physical and chemical phenomena that produce organized and living substance, also the leading in the body, the conversion of substances in products to be excreted."

Anyway, we know that all we eat is broken down into tiny particles through the process of digestion. These particles will be exploited, often processed to form energy and keep us alive. That's it. Sounds easy, but many things and situations can influence this mechanism, for example:

• Age: the older we get, the slower our metabolism;