This article is from the Food Science FAQ, bypking123@sympatico.ca (Paul E. J. King) with numerous contributions by others.
There is enough salt naturally present in food to satisfy our
daily 1 g need. However, salt is sometimes added during processing or
cooking of food, and is also often sprinkled on a meal by consumers
to enhance and improve the taste and flavour. Bread, tomatoes, boiled
eggs do not taste good enough for many people unless salt is added.
It is also used to preserve some foods. Salt curing is one of the
earliest known forms of food preservation.
 
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