Sitting all day is risky. Unless you do this.
People say: “Sitting is the new smoking” We read the study.
Meta-analysis of cohort studies. 1,005,791 people. follow-up 2 to 18.1 years depending on the cohort.
Many studies, added up. People were watched, not told what to do. A clue, not proof.
Who: Adults in 13 cohorts with sitting data (mostly older than 45, almost all from the USA, western Europe or Australia; one Japanese cohort), mostly apparently healthy at baseline; TV analysis: 6 cohorts, 465,450 people
- Sits 8h+, inactive+59%higher death risk
- Extra risk: sits 8h+, activenoneno clear extra risk
- Sits <4h, inactive+27%higher death risk
Sitting 8+ h a day but active ~60–75 min a day: no clear extra risk of death
TV was different.
More to know, from our read of the paper:
- Observational cohorts pooled: association, not causation; residual confounding possible (stated by the authors)
- Sitting, TV time and physical activity were all self-reported, once, at baseline
- Activity counted only walking + leisure-time/recreational activity (exercise, sports); work and household activity not included
- '60-75 min/day' is an approximate conversion of the top quartile's lower boundary (>35.5 MET-h/week) into moderate-intensity minutes; only about a quarter of participants reached it
- Most participants older than 45; all but one study from the USA, western Europe or Australia, so may not generalise beyond these populations
Active ~1 h a day: no clear sitting risk.
- Move ~1 hour a dayModerate pace, like brisk walking.
- Less still helps25–35 min a day already showed smaller risks.
- Watch the TV hours5+ h a day stayed risky, even for the active.
A Lancet meta-analysis of over 1 million adults (mostly 45+, US/Europe/Australia): the most active quarter, about 60–75 min of moderate activity a day, had no clear extra death risk from sitting 8+ hours. TV was a different story. Self-reported, observational: linked, not proven.
Ekelund et al. (2016). Does physical activity attenuate, or even eliminate, the detrimental association of sitting time with mortality? A harmonised meta-analysis of data from more than 1 million men and women. The Lancet.
Design: Meta-analysis of cohort studies · harmonised meta-analysis of 16 prospective cohort studies (linked, not proven)
DOI: 10.1016/S0140-6736(16)30370-1
Goals:
We read the abstract and the full text of this paper and checked every number on this page against it (18 facts, checked on 2026-10-01). The study design is named above. Cohort and other observational studies are described as linked, not proven. Found an error? Email theis@onestudyaday.com.
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