You sit all day? Scientists tested tiny breaks.

Meta-analysis of randomised trials. 166 people. each trial = one lab day of 5-8 h of sitting per condition (acute, 1-day); no long-term follow-up.

Many trials, added up. In each one, chance decided who did what.

Who: Adults (mean ages 24-70 across trials), mostly sedentary and overweight or with obesity; 5 UK + 2 US trials; 2 trials women-only (postmenopausal, impaired glucose regulation), 1 men-only. 166 people in total by summing Table 1 (10+17+10+34+10+25+60); the paper's '461 participants' counts each person once per comparison/arm

• Walking breaksLowerblood sugar
• Standing breaksA bitlower sugar

Each test lasted just one day.

More to know, from our read of the paper:

• Acute lab studies only: one day per condition; the authors say these results 'cannot easily be extrapolated' to long-term health. No outcomes like diabetes, weight or heart disease were measured
• NOT a 'walk right after a meal' study: the breaks were spread across the whole 5-8 h sitting day (e.g. 2 min every 20 min, 5 min every 30 min), starting around fixed test meals/drinks. The outcome was the post-meal (postprandial) glucose/insulin response over the day. Don't claim a specific timing like '10 minutes after dinner'
• Effect sizes are standardised (Cohen's d: 0.2 small, 0.5 moderate, 0.8 large), not mmol/L. The only plain-unit figure is the authors' descriptive average % reduction across studies (walking about -17%, standing about -9.5%), with wide ranges; it is not the pooled meta-analytic estimate
• Small evidence base: 7 trials, 166 people in total, glucose analysis only 7, insulin 4, SBP 4 trials (the text says 3 in the abstract and 4 in the results for SBP). Very high heterogeneity (I² 87-95% for most pooled results)
• Possible publication bias: Egger's test was significant for walking vs sitting (glucose and insulin) and walking vs standing (glucose and insulin); the authors note Egger's test can give false positives when results are heterogeneous

166 grown-ups, most of them overweight, sat in a lab for 5 to 8 hours. On some days they broke up the sitting with short breaks, usually 2 minutes every 20 minutes. Slow walking breaks kept blood sugar and insulin lower after meals; standing breaks lowered blood sugar only a little, and blood pressure did not change. Each test lasted one day, so long-term health was never checked (7 lab tests, added up: a meta-analysis of 7 randomised crossover trials).

We read the abstract and the full text of this paper and checked every number on this page against it (19 facts, checked on 2026-10-03). The study design is named above. Cohort and other observational studies are described as linked, not proven. Found an error? Email theis@onestudyaday.com.