When the dangers of ultraviolet light exposure are so well recognized, why has it been so hard to discourage people from spending time in the sun? A new study from Massachusetts General Hospital (MGH) investigators adds important support to the theory that ultraviolet (UV) light can actually be addictive, finding that chronic UV exposure raises circulating levels of beta-endorphin in mice and that UV-habituated mice exhibit withdrawal symptoms if beta-endorphin ...
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