Article: The U.S. food supply series: selected food and nutrient highlights, 1909 to 2000.

The variety and types of food commodities in the U.S. food supply and the nutrients they provide have undergone significant changes since 1909. In the 1930s, advancements in food-processing technologies introduced into the marketplace canned, frozen, and packaged items such as canned soups and vegetables, frozen vegetables and fruits, and packaged cereals. The result has been an increase in national availability and shelf life of these foods. During the 1930s, margarine was fortified with vitamin A and beta-carotene (for color) and milk was fortified with vitamins A and D. In the 1940s, flour and flour products were enriched with thiamin, riboflavin, niacin, and iron. Such ...

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