What is nutrition?

Nutrition starts with eating food and drinking drink. The body
then breaks down the food and drink into its respective nutrients.
These nutrients then travel around the body to be used wherever
necessary. Carbohydrates are converted into glucose or fuel for
the body, protein is broken down into amino acids and fats are
broken down into fatty acids. For a person to be healthy, a
person must eat enough food to get a good supply of all the key
nutrients.

There is a set of guidelines that the government publishes for 20
or so different vitamins, minerals and nutrients and those values
are based on population studies, where they go out and look at
the health of the general population and consider what people
consume on a regular basis.