Why Chronic Exhaustion Is a Bigger Risk for Women's Brains Than Men's

This study followed 5,219 women and 3,967 men, all free of cardiovascular disease, for six to nine years as part of the Copenhagen City Heart Study, tracking who went on to have a stroke. In women, there was a clear dose-response relationship: as vital exhaustion scores rose, so did stroke risk, reaching more than double the risk for those with the highest scores, an association that barely changed after adjusting for other risk factors. In men, despite a comparable range of exhaustion scores, there was no meaningful link to stroke risk at all, a genuine sex difference rather than a smaller version of the same effect.

With around 400 strokes recorded across the full cohort, the number of events specifically in the highest-exhaustion group was still modest, and as an observational study it can show a strong association without proving direct causation. The sex-specific finding is nonetheless striking and consistent with a broader pattern in this research area: chronic exhaustion appears to carry meaningfully different cardiovascular weight for women than for men, a distinction easily lost in research or guidance that treats the two as interchangeable.