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If you spend too much time in the sun, everyone can see it in your red, burnt skin. But if you get just enough sun exposure, scientists can see it in your poop — at least, according to a new study in the journal Frontiers in Microbiology.

Specifically, the researchers studied people with low Vitamin D to see how they reacted to UV light. This kind of sunlight is one of the main ways our bodies get enough Vitamin D, and the scientists saw that UV exposure did