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Similarly, sociologist Melanie DuPuis has described how milk was central to the construction of the modern Western nation state. The nutritionally “perfect” white drink was symbolically linked to the white-skinned bodies that were better able to digest it due to a genetic mutation known as lactase persistence. Early 20th century milk advertisements perpetuated this trope, often juxtaposing images of healthy-looking, light-skinned people with sickly-looking, darker-skinned ones. “By declaring milk perfect,” says DuPuis, “white northern Europeans announced their own perfection”.