This article is from the Food Science FAQ, bypking123@sympatico.ca (Paul E. J. King) with numerous contributions by others.
Salt is essential to a healthy diet. We need about 1 g of salt a
day. However, many of us consume about 10 g a day, ten times as much
as we really need. A single dose of ten times that amount could be
fatal! There is evidence that, for some people, too much salt can be
a contributory factor to high blood pressure. Just how much is 'too
much' varies from person to person. Prudent advice would be to reduce
consumption to around 5 g per day.
 
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