9/30/2026
Vital Signs · nutrition

Blood tests reveal why astronauts get constipated in space

Filed by Dr. Iris Vale
Blood tests reveal why astronauts get constipated in space
Spaceflight may dramatically change the gut within weeks, causing bacteria to break down more protein as food moves more slowly through the intestines. The shift could help explain astronaut constipation and may have wider effects on health, making it an important concern for future missions to Mars.
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Dr. Iris Vale
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Blood tests reveal why astronauts get constipated in space — Vital Signs