07/06/2026
If a pill reduced your dementia risk by 66%, you'd take it every day without question. That pill exists. It's not a pill. 🧵
2,315 Finnish men. 20.7 years. 204 dementia cases tracked. The KIHD cohort didn't study a drug. They studied a sauna.
The result: 4–7 sessions per week → 66% lower dementia risk. 65% lower Alzheimer's risk.
Here's what nobody talks about. The dose-response isn't linear. 2–3x/week = 22% protection. 4–7x/week = 66% protection. One extra session crosses you from modest protection to near-total protection.
Every major Alzheimer's drug trial in the last decade failed to clear 20%.
A wooden room at 80°C hit 66%.
The protocol: 4 sessions. 20 minutes each. 80 minutes a week. Less time than most people spend scrolling before bed on a single night.
The barrier isn't willpower. It's access.
Laukkanen JA, et al. Age and Ageing. 2017;46(2):245–249.