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| Daily peanuts helped memory areas answer insulin |
| Your brain runs on insulin too. Most of us think of insulin as a blood sugar hormone. But it also works inside the head. It helps memory cells take in fuel. It tells small blood vessels to open. When the brain stops listening, scientists call it brain insulin resistance. That’s why some call Alzheimer’s “type 3 diabetes.” |
| A Dutch team tested a plain snack. Peter Joris and Lucia Kerkhof work at Maastricht University Medical Center. They signed up 31 healthy adults aged 60 to 75. For 16 weeks, each ate 60 grams of unsalted, skin-on roasted peanuts a day. That’s about two small handfuls. For another 16 weeks, they ate none. So each person was compared with himself. |
| Let me explain how you measure this. The team sprayed a little insulin up each nose. From there it reaches the brain in minutes. A scanner then tracked how blood flow shifted in reply. Think of ringing a doorbell and timing how fast someone answers. |
| After the peanut months, the answer improved. It showed up in a cluster on the right side of the brain. That cluster held the memory hub and the areas wired close to it. The same group saw a hint last year, too. Daily peanuts raised blood flow across the whole brain by 3.6%. Word memory scores rose 5.8%. |
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Peanuts carry good fats, fiber and arginine. That’s a building block the body uses to relax blood vessels. Which part does the work is still a guess. |
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| Now weigh it fairly. This was 31 people. The Peanut Institute Foundation, an industry group, paid for it. The team says the funder had no say in the work. And it measured a brain signal, not dementia. I could be wrong to read much into it. Still, I believe the direction is worth watching. Brain insulin is one of the clearest threads from blood sugar to memory. |
| So if you snack, pick plain peanuts. I urge you to skip the salted and honey-roasted kind. Sixty grams runs about 340 calories. Let them replace the chips, not join them. And skip this one if you have a peanut allergy. |
| Maastricht University Medical Center · Food & Function · September 30, 2026 |
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| Own the sleep machine? Wear it all night. |
| The machine only works on your face. Plenty of men with sleep apnea own one. Plenty of those machines sit in a closet. Now there’s ten years of data on what that costs. |
| Sleep apnea closes your airway at night. Breathing stops, then starts with a jolt. Christopher Kaufmann’s team at the University of Florida studied 777 older adults on Medicare with the condition. Each took memory and thinking tests every year from 2011 to 2021. Everyone slipped a little. But the ones who never used a pressure machine slipped 69% faster than the ones who did. |
| Each pause starves the brain of oxygen. It lasts a few seconds. It can happen dozens of times an hour. Picture a well pump that keeps losing its prime. The brain never gets a long, quiet stretch to rest. |
| This study came out in July. It shows a link, not proof. Men who wear the mask may also take their pills and walk more. But the fix already sits by a lot of beds. So set it up like this. |
| The Protocol |
| When |
| Every time you sleep — the whole night, and naps too |
| Duration |
| For good. The study followed people for ten years. |
| Rules |
| Aim for at least 4 hours a night. That’s the bar Medicare uses, and more is better. If the mask leaks, dries your mouth or hurts, call the supplier for a refit. Don’t quit. Clean the mask and hose once a week. No machine yet? If you snore loudly, wake up gasping or doze off by day, ask your doctor about a home sleep test. |
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| Give it two weeks. Most men need that long to stop noticing the mask. Watch for clearer mornings and fewer afternoon naps. I urge you to try it. |
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| Gum disease tracked with a bit more dementia |
| Gum disease is a slow infection. It sits at the base of your teeth. A team at Dalhousie University in Halifax pooled the long-term studies on it. They read 13, and four could be combined. People with gum disease had about 12% higher dementia risk. That’s modest. And it may run both ways. A man whose memory is slipping may stop brushing well. Still, two cleanings a year cost little. Keep them on the calendar. |
| Dalhousie University · review of 13 studies · October 2026 |
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| An old head knock rewired the stress switch, in mice |
| A blow to the head can echo. María Dolores López’s team at the University of Malaga worked with Ohio State on male mice. After a brain injury, the mice later faced stress. Their hypothalamus, the brain’s stress control room, ran hotter with inflammation. The brain’s immune cells stayed primed. The mice acted more anxious and kept away from others. Yet the stress hormone in their blood looked normal. So a routine blood test would miss it. These are mice. But if you took hard hits in football or the service, mention it when stress lands harder than it should. |
| University of Malaga · Brain, Behavior, and Immunity · October 2026 |
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| Old blood cells came back as fresh brain stem cells |
| Bonn scientists skipped a step. Oliver Brüstle’s team took cells that normally grow into red blood cells. With a mix of gene switches, they turned them straight into brain stem cells. Those are cells that can become neurons. Even cells from an 80-year-old came out looking young. The chemical age marks on their DNA were largely wiped. The reset took about 100 days, so the team could watch it step by step. This is a dish, not a treatment. But it gives scientists a way to test what speeds the reset or slows it. |
| University of Bonn · Aging Cell · October 9, 2026 |
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| Do brain-training games do anything? |
| Side A |
| One trial says yes, decades later. Starting in 1998, U.S. researchers trained 2,802 adults aged 65 and up. One group practiced a fast task on a computer. Spot things on a screen, quicker and quicker. Ten sessions over five or six weeks, with refreshers at one year and three. In February, the team checked Medicare records 20 years on. In the speed group with refreshers, 40% had a dementia diagnosis. With no training, 49% did. That works out to 25% lower. The task got harder as people improved, and backers say that’s the point. |
| Side B |
| Most games make you better at the game. In 2014, about 70 scientists signed a statement through the Stanford Center on Longevity. They found no solid proof the games prevent or reverse decline. A 2016 review led by Daniel Simons at the University of Illinois agreed. Gains on the trained task rarely carried into daily life. That same year, the Federal Trade Commission made Lumosity pay $2 million over its brain claims. And the 20-year result came from one of three training types. Memory and reasoning practice showed nothing. The diagnoses came from billing records, not exams. |
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