Study links weightlessness to slower digestion and constipation in astronauts

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  Researchers at the University of Copenhagen investigated how low gravity affects digestion and bowel transit in space.

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  The study followed 52 astronauts from different countries who served on the International Space Station, using blood tests taken before and during their missions.

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  Researchers found that food takes longer to pass through the intestines in low gravity, giving gut bacteria more time to digest fibre and then ferment proteins.

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  The article says this increased fermentation contributes to constipation and may affect the brain, potentially causing anxiety or problems with concentration.

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  The findings point to possible countermeasures, including diets richer in fibre and treatments that help intestinal muscles speed up transit.

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  The results may also help researchers understand digestive problems in people on Earth who spend long periods lying down.

Who

Researchers at the University of Copenhagen and 52 astronauts who served on the International Space Station

What

A study examined how low gravity slows intestinal transit and affects digestion

When

Published on 10 October 2026; the study's dates are not stated

Where

The International Space Station

Why

To understand and help counter digestive problems linked to low gravity and prolonged periods lying down

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