Although soybeans have been a staple crop in China for thousands of years, they have come to Western kitchens only in recent years. In 1904 George Washington Carver noted that the soybean is a rich source of protein and oil. By the early 1930s these beans were grown commercially in the United States. Since then they have been widely used to feed livestock and are currently one of the biggest cash crops in America.
Today soy is known as an inexpensive source of protein. Both the Food Guide Pyramid and Nutrition and Your Health: Dietary Guidelines for Americans, fifth ed., list soy foods as a way to meet dietary guidelines. A one-cup (8 oz.) serving of tofu, for example, is listed as a serving suggestion in the meat and beans Group.
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