Food And Nutrition: Meaning Of Food Purchasing, Food Processing And Food Preservation

Meaning Of Food Purchasing, Processing, Preservation And Food Safety.


This the process of procurement of food by means of a financial transaction. Food Purchasing Is obtain food in exchange for money or its equivalence; to buy food, food may be purchased in raw, cooked or processed forms.


This is the transformation of raw ingredients, by physical or chemical means into other forms of the food.

It involves activities such as mincing, liquefaction, emulsification, cooking (such as boiling, broiling, grilling), pickling and preservation, canning or jarring.

These activities or a combination thereof, result in the manufacture of ready-to-cook or precooked food products like confectionery, instant foods, flavored and health drinks, pickles, jams, canned foods, purees, jellies, powders and mixes, sauces, etc.


This involves preventing the growth of bacteria, fungi (such as yeast) or any other micro-organisms,as well as retarding the oxidation of fats that cause rancidity (spoilage of fat).

Food Preservation can also include processes that inhibit visual deterioration, such as the enzymatic browning (reaction in apples after they are cut), which can occur during food preparation.


Food safety is a scientific discipline describing handling, preparation and storage of food in ways that prevent food-borne illness. It involves a number of routines that should be followed to avoid potentially severe health hazards. Food safety goes through these processes:

i. Prevent contamination of food with pathogens which can spread from people, pets, and pests.

ii. Separate raw and cooked foods to prevent contaminating the cooked foods.

iii. Cook foods for the appropriate length of time and at the appropriate temperature to kill pathogens.

iv. Store food at the proper temperature.

v. Use safe water and cooking materials.

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