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| Your muscles make a hormone that cleans the brain |
| Your muscles talk to your brain. They do it with a hormone called irisin. Every time you work them, they send it out. Some of it reaches the brain. And in people with Alzheimer’s, irisin runs low. |
| Let me explain what it does up there. Irisin nudges your brain’s support cells — the astrocytes — to make more of an enzyme called neprilysin. Think of neprilysin as a cleanup crew. Its one job is to chew up amyloid, the sticky gunk tied to Alzheimer’s. More irisin, more cleanup. A Massachusetts General Hospital team, led by Christiane Wrann and Rudolph Tanzi, showed this in a lab-grown model of the disease. |
| Now there’s a first look in people. Researchers scanned 74 older adults and measured their irisin. The more someone moved, the more irisin they carried — and the larger their hippocampus, the brain’s memory hub. The link ran straight through the hormone. Movement fed the memory center by way of irisin. |
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The target here isn’t a pill. It’s a hormone your own legs can make. |
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| I could be wrong, of course. This human work is early and small, and a win in a dish often shrinks in a body. But it fits everything we know. Exercise protects memory — and now we can see one wire that carries the signal. |
| You don’t need a lab to use this. I urge you to move most days — walk, lift, garden, dance. Your muscles will make the medicine. |
| Neuron, 2023 · Aging Cell, 2026 |
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| Eat one fermented food a day |
| Your gut and brain share a line. Trillions of tiny bugs live in your gut, and they send signals north. When they break down food, they make short-chain fatty acids like butyrate — a calming compound that reaches the brain and quiets inflammation. |
| A wider mix of bugs makes for calmer signals. And fermented food is the simplest way to widen it. A Stanford team (Justin Sonnenburg and Christopher Gardner) put adults on ten weeks of fermented food. Their gut variety grew, and their markers of inflammation dropped. |
| You don’t need a supplement for this. You need your fork. |
| The Protocol |
| When |
| With one meal a day — breakfast or lunch is easy |
| Duration |
| Every day; judge it at eight weeks |
| Rules |
| One to two servings of live-culture foods — plain yogurt, kefir, kimchi, sauerkraut, miso. Check the label for “live” or “active cultures.” Keep the added sugar low. Start small so your gut can adjust. |
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| A little gas at first is normal, and it settles as your gut finds its balance. Give it eight weeks before you judge. I urge you to try it. |
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| The brain has a drain you’ve never heard of |
| Scientists found little-known cells called tanycytes that act like a drain. They pull toxic tau — the protein that tangles in Alzheimer’s — out of the fluid around the brain and hand it to the blood, where the body clears it. In Alzheimer’s brains, these cells were broken and frayed. And when the team blocked them in mice, tau built up faster. A fresh cleanup route worth watching. |
| Cell · 2026 (Kyoto University & INSERM) |
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| A faster resting pulse tracked with faster decline |
| Check your pulse when you’re sitting still. In a 2026 analysis, adults with a resting heart rate of 70 beats a minute or higher slipped faster on memory and thinking tests over time. The sweet spot sat between 60 and 69. It’s only a link. But a lower resting rate is one more reason to keep moving — a fitter heart tends to beat slower at rest. |
| GeroScience · 2026 |
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| Sound waves are prying open the brain’s front gate |
| The brain sits behind a tight security gate — the blood-brain barrier — that keeps most drugs out. Doctors are now aiming focused sound waves at it to open it safely for a few hours. In a small 2025 trial, that helped clear amyloid, with only mild headaches as a side effect. A new round of the study is set to begin this August. |
| Focused Ultrasound Foundation · 2025–2026 |
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| This is a big year for Alzheimer’s drugs. Eight late-stage (Phase 3) trials reach their finish line, and 29 mid-stage trials report back. And the search keeps widening past amyloid — toward tau, inflammation, and the immune system. Here are three worth knowing. |
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| A pill that shields the brain’s memory switchboard |
| The maker is CervoMed. The drug is neflamapimod, an oral pill for dementia with Lewy bodies — the second most common dementia after Alzheimer’s. It calms an inflammation enzyme (called p38) and protects the basal forebrain, the hub that feeds the brain its memory-and-attention signals. In a mid-stage trial, it slowed the shrinking of that hub. A larger trial is being planned. |
| Phase 2b RewinD–LB · 2026 |
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| A once-a-day pill for early Alzheimer’s just finished its big test |
| AriBio’s drug, AR1001 (also called mirodenafil), is an oral tablet from the same family as blood-flow pills used for the heart. It aims at toxic amyloid clumps and helps neurons stay alive. Its Phase 3 trial — 1,535 people with early Alzheimer’s across 13 countries — wrapped up its treatment phase on July 27. The full results come in November. |
| Phase 3 POLARIS–AD · results Nov 2026 |
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| An oral drug that breaks up amyloid — without the brain swelling |
| The amyloid antibodies now on the market can cause brain swelling or tiny bleeds. Priavoid’s pill, PRI-002, takes a different path: it’s a small molecule you swallow that pulls apart toxic amyloid clumps. In a mid-stage trial of 304 people with early Alzheimer’s, it showed none of that swelling. The trial finishes at the end of the year. |
| Phase 2 · readout late 2026 |
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