Why do we fall sick?

Actually most people like me do not know that why we keep falling sick. But fortunately due to some coincidental situations - my girl keeps falling sick after going to childcare, I get to know someone who shares about the knowledge of our immune system.

 Firstly, let us see what is immune system - immune system is a network of cells, tissues, and organs that work together to defend the body against attacks by "foreign" invaders. These are primarily microbes such as bacteria, parasites, and fungi that can cause infections. Viruses also cause infections, but are too primitive to be classified as living organisms. It is the immune system’s job to keep them out or, failing that, to seek out and destroy them.
When the immune system hits the wrong target, however, it can unleash a torrent of disorders, including allergic diseases, arthritis, and a form of diabetes. If the immune system is crippled, other kinds of diseases result. The immune system is amazingly complex. It can recognize and remember millions of different enemies, and it can produce secretions (release of fluids) and cells to match up with and wipe out nearly all of them.
By knowing that immune system helps our body to defend against many "foreign" invaders in a day, we should know by now that we fall sick as the immune system is malfunctioning. Hence how do we maintain the health of our immune system? It is common knowledge that cars need regular servicing to ensure peak performance. Likewise, the immune system needs proper nourishment daily for optimal functioning of the body. This often requires a double-pronged approach: providing nutrients to fortify the immune system against diseases during the day while focusing on regeneration and repair of immune cells at night.



Credits to:
https://www.vaccines.gov/basics/prevention/immune_system/index.html

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