From the Desk of a Doctor Newsletter
🧠 The Overlooked “Nutrient” Transforming Cognitive Health
What if one of the most powerful tools for brain health isn’t found in a supplement bottle — but in your daily routine?
A 2023 study in Sleep Health from University College London (PMID: 37344293) found that habitual daytime napping is associated with slower brain aging and larger brain volume, a marker of long-term cognitive resilience.
Importantly, this wasn’t just an observational study. Researchers used Mendelian randomization, a genetic method that helps reduce reverse causation and confounding.
The Study:
378,932 participants from the UK Biobank
Genetic analysis of daytime napping habits (to correct for people who are genetically predisposed to naps and make sure it’s the napping itself that makes a difference, not genetics)
Brain MRI data used to assess structural aging
Key Findings:
✅ Habitual nappers had 15.8 cm³ larger total brain volume
✅ This difference equates to ~2.6–6.5 fewer years of brain aging
✅ Suggests neuroprotection against age-related brain shrinkage
❌ No significant association with hippocampal size or short-term cognition
Why it matters:
Brain volume loss is a hallmark of aging and neurodegenerative risk. Preserving volume reflects greater neural reserve, which may help delay cognitive decline even if symptoms don’t change immediately.
How to nap for brain health:
💤 10–20 min: Best for alertness and energy
💤 30–60 min: Some cognitive benefit, possible grogginess
💤 ~90 min: Supports learning, memory, and brain recovery
Takeaway:
Napping isn’t laziness — it may be a low-effort strategy to preserve brain structure and slow cognitive aging.
— Dr. Myro Figura
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About the Author
I’m Dr. Myro, a board-certified doctor and med school educator who somehow ended up with over 6 million followers watching my science videos on
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and Facebook.
I’ve published 60+ scientific abstracts and even written a book, but this newsletter is my favorite project. Here I get to share the good stuff — simple, actionable health tips delivered twice a week. Happy to have you here.
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