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This week’s deep dive
The Sauna Dose-Response Study
Most sauna coverage, including ours, repeats the same headline: four to seven sessions a week, dramatically lower dementia risk. What gets left out is the shape of the curve either side of that number.
A separate, larger Finnish cohort — 13,994 people, followed for up to 39 years — found the lowest dementia risk sat at 9–12 sessions a month, not higher. People using a sauna daily or near-daily didn’t show additional benefit over that group. The sweet spot for duration and heat was specific too: 5 to 14 minutes, at 80–99°C. Sessions above 100°C were linked to higher dementia risk, not lower.
A new March 2026 paper, from researchers across four institutions including NYU Grossman and Washington University, adds a plausible mechanism — heat shock proteins that may help manage the misfolded proteins central to Alzheimer’s. The upshot: more isn’t better past a point, and the specifics matter more than the headline number ever suggested.
Read the full piece →
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