Blood tests have revealed a physiological reason for constipation in astronauts during spaceflight.

What it means

A new study analyzing blood samples from 52 astronauts has identified a physiological cause for the constipation commonly experienced during spaceflight. Within weeks of entering microgravity, astronauts' gut bacteria shift to break down more protein, which slows intestinal transit and leads to constipation. The findings, based on 488 plasma samples, offer a biological explanation for a known problem and may have implications for long-duration missions.

Accuracy & sourcesGrounded

The claim is solid, based on a peer-reviewed study (likely from researchers at the University of Copenhagen) that analyzed blood samples from 52 astronauts. Multiple reputable outlets (Science Daily, Space.com, Live Science, Euronews) report consistent details, indicating the reporting is close to the primary source.

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