Food is anything solid or any beverage which when we ingest, digest and it assimilate, gives energy and essential material for body building and maintenance.
1. Classification by origin
a. Food of animal origin
b. Food of vegetable origin
2. Classification by chemical composition
3. Classification by nutritive value
4. Classification basis of function
a. body building food
b. energy giving food
c. protective food
Food contain organic and inorganic compound which are called elements of food.
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