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Why are eggs not classified as dairy products?

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Eggs are not classified as dairy products because they are not derived from milk. By definition, a dairy product consists exclusively of milk or foods manufactured from the milk of mammals, such as butter, cheese, ice cream, and yogurt.1

While eggs are a common animal-based food, they do not originate from the mammary glands of animals, which is the fundamental requirement for a product to be categorized as dairy.1