Human study · Supplements / medicine · 2 Sept 2026
Each extra hour of prolonged sitting linked to 9% higher cancer death risk
Source: ScienceDaily
What the research found
Study (observational). University of Glasgow researchers writing in PLOS Medicine followed 91,292 UK Biobank adults who wore activity monitors for 7 days, then tracked them a median 12.38 years. Each extra hour of sitting lasting at least 30 minutes tracked with 9% higher cancer mortality (HR 1.09). Replacing one hour of prolonged sitting with light activity associated with 12% lower cancer death risk (HR 0.88). Interrupted sitting showed the opposite pattern. This is association, not proof that sitting causes cancer. UK Biobank volunteers tend to be healthier than average. Breaking up long sits is a movement habit, not a disease treatment.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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