The JAMA Neurology study found that both sleeping six hours or less and sleeping nine hours or more per night were associated with higher body mass index compared to sleeping seven or eight hours per night.
Notes on verification
Directly confirmed by the primary JAMA Neurology study (Winer et al., 2021) and corroborated by PubMed, Ovid reproduction, and independent secondary reporting (Healio, Fox News). [tier=gold indep_score=0.9 clusters=4 claim_tier=notable | framework convergence=single on Winer et al. 2021 JAMA Neurology study using A4 study cohort data (upstreams: A4 study (Anti-Amyloid Treatment in Asymptomatic Alzheimer's Disease), Winer et al. 2021 JAMA Neurology) — publishers independent, evidence may not be | kind=attributed eligibility=high]
Sources
- How much sleep keeps cognitive decline at bay? - Harvard Health (seed:psychology_and_neuroscience)
- https://pubmed.ncbi.nlm.nih.gov/34459862/ (corroboration)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC8406215 (corroboration)
- https://www.healio.com/news/neurology/20210908/short-long-sleep-duration-worsen-older-adults-amyloid-beta-burden-cognition (corroboration)
- https://www.foxnews.com/health/alzheimers-risk-sleep-study.amp (corroboration)
- https://www.ovid.com/journals/janeu/pdf/10.1001/jamaneurol.2021.2876~association-of-short-and-long-sleep-duration-with-amyloid- (corroboration)