Most people experience constipation at some point in their lives. For astronauts, it’s a common occurrence. The problem is that no one knew exactly why. Now, science seems to have figured out the No. 1 reason why astronauts have problems going No. 2 in space.

Research dating back nearly three decades has explored the effects of low- or zero-gravity environments on human digestion. A new study published in Nature by researchers at the University of Copenhagen working in tandem with NASA suggests that because astronauts spend so much time in microgravity, this state of near weightlessness causes food to move more slowly through the gut.

To carry…

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