Summarize this blog post with:
We all know that a good night’s sleep is fundamental to health. However, few people realize this
How scientists measured sleep-related brain age
Researchers examined more than 27,000 adults from the UK Biobank database, with the mean age of participants being approximately 55 years. They used a machine learning (AI) model that analyzed more than a thousand parameters from magnetic resonance imaging (MRI) determine how old the brain was compared to a person’s actual age. [1]
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Sleep quality was assessed based on five common factors that participants self-reported in a questionnaire:
- whether they are morning or evening types
- how many hours they sleep per day (ideally 7-9 hours) [2]
- whether they suffer from insomnia
- or they snore
- whether they are excessively tired or sleepy during the day
Based on these factors, a healthy sleep index was made, rated on a scale of 0–5 points. The participants were divided into three groups: healthy sleep (≥4 points), moderate (2-3 points) and poor sleep (≤1 point).
What has the research yielded and why is it important?
People with poor sleep quality (1 point or less), compared to the healthy sleep group (4 points or more), had an average of 1 year biologically older brain than their actual age. So why does it matter? Scientists further explain that sleep quality is important for the brain because:
- Poor sleep can accelerate brain agingwhich increases the risk of later cognitive decline and dementia
- chronic inflammation (low-grade inflammation) in the body has been identified as one of the possible mechanisms driving the aging process of the brain. According to scientists, low-grade inflammation could be responsible for about 10% of the differences in biological brain age.
These findings are consistent with previous research showing that sleep is crucial for a wide range of biological functions, including: metabolism regulation, modulation of immune function, removal of toxins from the brain and memory consolidation. [3–5]
Should you worry about the biological age of your brain?
The research results are quite significant. However, the scientists’ message is not intended to scare people who have not slept optimally today. In conclusion, they emphasize that sleep is an influenceable factor. This means that it can be worked on and improved in different ways and with different methods. We have discussed these, for example, in the articles:
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What does this all mean for us?
Ultimately, this means that quality sleep can be the best anti-aging tool for the brain. We can slow down its aging by focusing on optimal sleep duration (7-9 hours per day) and quality. Of course, it’s also necessary to take your diet into account and focus on healthy fats, such as
Sources:
[1] Yuyang Miaoa, Jiao Wangc, Xuerui Lia, Jie Guoc, Maria M. Ekblomf, Shireen Sindih – Poor sleep health is associated with older brain age: the role of systemic inflammation – https://www.thelancet.com/journals/ebiom/article/PIIS2352-3964(25)00385-8/fulltext
[2] How much sleep is enough? – https://www.nhlbi.nih.gov/health/sleep/how-much-sleep
[3] F Haist, J Bowden Gore, H Mao – Consolidation of human memory over decades revealed by functional magnetic resonance imaging – https://pubmed.ncbi.nlm.nih.gov/11600889/
[4] Lulu Xie, Hongyi kang, qiwu xu, Michael J Chen, Yonnghong Liao, Menakshisundaraam Thirajan, John O’Donnel, Daniel J christeensen, Charles Nicholson, Jeffrey J Iliff, Takahiro Takan, Rashid Deane, Maiken Nedergar stimulates the clearance of metabolites from the adult brain – https://pubmed.ncbi.nlm.nih.gov/24136970/
[5] Jerome M Siegel – Sleep function: an evolutionary perspective – https://www.thelancet.com/journals/laneur/article/PIIS1474-4422(22)00210-1/abstract
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