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| What the sauna may do for your brain |
| Heat may be quiet brain care. Finland handed us the best clue. For years, doctors there followed thousands of middle-aged men and tracked how often each one used the sauna. The men who went most often got dementia the least. |
| Let me explain the numbers, because they are big. Researchers followed about 2,300 men for two decades. Set against one sauna a week, four to seven a week came with roughly 65% lower risk of Alzheimer’s. That is not a gentle nudge. That is a wide gap. |
| So what could heat be doing up there? A hot room works your body a little like a light walk. Your heart speeds up. Blood flows harder, and blood pressure eases over the months. Your cells also switch on ‘heat-shock proteins’ — a repair crew that helps fix or clear damaged proteins, the same sticky junk that clogs an aging brain. |
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One honest catch. These men had used saunas since childhood, so we cannot say the heat alone did it. Calmer, healthier, better-off people may simply sauna more. No large trial has settled the question yet. |
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| So I could be wrong about how much of this is the heat itself. We are talking about research still in progress. But the habit is pleasant, the cost is low, and the good it does your heart rests on firmer ground. |
| If your heart is not well, ask your doctor first. If it is, I urge you to enjoy the heat and let your brain take the bonus. |
| University of Eastern Finland, Kuopio study (Laukkanen et al.) · ~2,300 men, 20-year follow-up |
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| Eat a serving of leafy greens a day |
| Leafy greens are humble but mighty. You have heard ‘eat your vegetables’ your whole life. Here the science gets oddly specific. In a long study of older adults, those who ate about one serving of greens a day had thinking that looked roughly 11 years younger than those who ate almost none. |
| The nutrients do the work. Greens carry folate, vitamin K, lutein, and nitrates — the kind that help shield brain cells and keep blood moving to them. Think spinach, kale, collards, romaine, arugula. Cooked or raw, both count. |
| One serving is easier than it sounds. Here is the plan. |
| The Protocol |
| When |
| Once a day, at any meal — a handful is about one serving |
| Duration |
| Daily — give it a few months to settle into routine |
| Rules |
| One packed cup raw, or half a cup cooked. Rotate types so you do not get bored. Add a little olive oil — the fat helps you soak up the good stuff. Frozen greens count, and they cost less. |
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| You will not feel a thing day to day. This is a slow, steady deposit. I urge you to start with tonight’s dinner. |
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| A slow thyroid can look like brain fog |
| Fog is not always aging. Your thyroid, a small gland in your neck, sets your body’s pace. When it runs slow — common after 60, and easy to miss — it can dull memory, focus, and mood in a way that mimics early decline. The good part: a simple blood test can catch it, and treatment often lifts the fog. If your thinking feels off lately, ask your doctor to check your thyroid before you fear the worst. |
| Thyroid and cognition review, Frontiers in Endocrinology · 2026 |
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| Dirty air reaches the brain too |
| Your lungs are not the only target. A 2026 study of nearly 28 million older Americans tied dirtier air to more dementia. The likely culprit is fine soot from traffic and smoke — specks small enough to slip from your lungs into your blood, and on toward the brain. You cannot scrub the whole sky. You can help the air you breathe most: run a good air filter at home, vent the kitchen when you cook, and skip the jog beside a busy road at rush hour. |
| Analysis of ~28 million older U.S. adults (ScienceDaily) · 2026 |
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| A pet may go with slower decline |
| Your dog may be doing real work. In studies of older adults, pet owners — especially those who live alone — held onto memory and thinking a little better over time than people with no pet. Nobody says the pet is medicine. But a dog gets you walking, a cat gives you company, and both hand your day a shape and someone to care for. If you have a pet, that daily routine is quietly on your side. |
| Pet ownership & cognition studies, JAMA Network Open and others · 2023–2026 |
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| Dr. Andrew Huberman |
| Neuroscientist; tenured professor at Stanford School of Medicine; host of the Huberman Lab podcast |
| Huberman built his name on daily habits, and he keeps a strict morning. He gets sunlight in his eyes within an hour of waking — 5 to 10 minutes outside, no sunglasses — to set his body clock. He waits 90 minutes to two hours before coffee, so the caffeine does not blunt his natural morning alertness. He often skips breakfast and eats later. Most days he trains, rotating cardio and weights across the week, and takes a short cold shower or plunge, then heat. For sleep he leans on a small stack: magnesium (the threonate form), a little apigenin (from chamomile), and L-theanine. He adds fish oil and vitamin D. And midday he lies down for ‘non-sleep deep rest’ — 10 to 20 minutes of quiet, guided calm to reset without sleeping. |
| Here is the honest part. The free habits — morning light, steady sleep, exercise, timed caffeine — sit on solid ground and cost you nothing. The supplement stack runs ahead of firm proof, and what fits a lean man in his 40s may not fit you; the cold plunge alone is no small thing for an older heart. He is a teacher, not your doctor. Take the low-risk habits, and run the rest past someone who knows your health. |
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