short non-fiction · body & health
Sitting is not “the new smoking”
A short idea drawn from Spark: The Revolutionary New Science of Exercise and the Brain by John J. Ratey & Eric Hagerman.
Long sedentary time is associated with poorer health outcomes, and public-health guidance recommends limiting it. But the slogan that sitting is “the new smoking” collapses different exposures, effect sizes and evidence. Tobacco smoke is a toxic exposure with no safe form; sitting is also a necessary posture whose risk depends on duration, context and activity around it.
Correcting the comparison does not make prolonged inactivity harmless. It restores proportion so evidence can be read without borrowing smoking's emotional weight. Movement and sedentary time are related but distinct parts of a day, and population associations do not turn a chair into a cigarette.
Based on the work of
John J. Ratey & Eric Hagerman
· 2008
Why this bookAn energetic account of movement and brain health, usefully tempered by newer evidence.
What to keep in view
Sedentary behaviour is associated with health risks, but individual risk varies and comparisons need matched evidence.