Small Breaks From Prolonged Sitting May Cut Cancer Risk
A UK Biobank study of 91,292 adults finds that each extra hour of prolonged, uninterrupted sitting is linked to about a 9% higher risk of cancer death, while breaking up sitting with light activity lowers cancer incidence and mortality (roughly a 12% reduction when replacing an hour of sitting). These findings imply that how sedentary time is accumulated matters, not just total time, and suggest benefits from regular, light movement—even without intense exercise—though the study is observational, with only seven days of monitoring, so causality and broad generalizability are limited.