Approximately 12 million U.S. citizens consider themselves vegetarians, and 13.5 percent of all U.S. households claim to have at least one family member practicing some form of vegetarianism. In the past 30 years, scientific endeavors in the area of vegetarian nutrition have progressively shifted from investigating dietary concerns held by nutritionists and other health professionals to creative solutions for various medical conditions and preventive approaches to chronic diseases. Although professional interest in vegetarian nutrition has now reached unprecedented levels, scientific knowledge regarding vegetarian diets and their positive effects on human health is far from complete.

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