What people eat is not well documented. Food writers prefer to focus on fashionable, expensive restaurants whose creative dishes reflect little of what most people are eating.

Salt is an unusual food product because it is almost universal - all human beings need salt, and most choose to eat more than is necessary.

Before refrigeration, most food was heavily salted. Many of these salted foods have persisted, such as sauerkraut, pickles, cured anchovies, cheese, salted butter, ham, corned beef, sausage, and bacon. We still eat these things because we like them. But they are no longer the mainstay of our diet.

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