Some of this doesn’t pass the smell test: > People who worked out but then plopped into chairs for 10 hours or more were as prone to dementia as people who had

Some of this doesn’t pass the smell test: > People who worked out but then plopped into chairs for 10 hours or more were as prone to dementia as people who hadn’t exercised much at all. This just isn’t plausible as a real effect. It suggests the causation is reversed. > If the men and women sat for at least 10 hours a day, which many of them did, their risk of developing dementia within the next seven years was 8 percent higher than if they sat for fewer than 10 hours. The risks ballooned from there, reaching a 63-percent greater risk of dementia for people who spent at least 12 hours chair-bound. Weird non-linear effects at arbitrary cutoffs are usually statistical artifacts. It seems unlikely that 9.5 hours is “fine” but at 10 hours you are doomed.