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Structure/function statements describe the role of a nutrient or dietary ingredient intended to affect normal structure or function in humans. They may also characterize the means by which a nutrient or dietary ingredient acts to maintain such structure or function. Additionally, structure/function statements may also describe a benefit related to a nutrient deficiency disease (like vitamin C and scurvy), as long as the statement also tells how widespread such a disease is in the United States. The Food and Drug Administration (FDA) is the primary federal regulatory agency that has the responsibility of regulating such statements that appear on the labels or labeling of food products.