The researchers found that the more servings of oranges, grapefruits or juices from these fruits that the participants consumed overall, the higher their risk of melanoma. Subjects who consumed a serving of these fruits or their juices at least 1.6 times a day, for example, were found to be at 36% higher melanoma risk. It may be because the fruits are rich in psoralens and furocoumarins, which are believed to make the skin more sensitive to the sun. “These substances are potential carcinogens, as found in both mice and humans. Psoralens and furocoumarins interact with UV light to stimulate melanoma cells to proliferate,” explains Dr. Marianne Berwick, of the University of New Mexico in Albuquerque, in an editorial linked to the study.
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