Every living organism needs some substances that are
essential for it to survive and which cannot be manufactured in the organism's body.
These substances are used as sources of energy, for all the chemical reactions that go
on in the body and for the development of the basic bodily structure of the organism.
Nutrient is the term used for these substances.
In humans,
nutrients are usually classified into categories like carbohydrates, fats, proteins,
minerals, vitamins and water. There are several nutrients that the human body cannot
survive without and these are called essential nutrients, examples include proteins,
fats, water, etc. Others can be substituted by the essential nutrients or it can be said
that their absence does affect survival, examples of these are carbohydrates, substances
like anti-oxidants, etc.
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