The Open Question
Can the cells that insulate your brain’s wiring also damage it?
Your brain has insulating cells. Their only job is to make myelin, the coating that lets signals travel fast along nerve fibers. But a University of Edinburgh study of 866 people, published in Nature Medicine this month, found a problem. When a protective protein called NRF2 drops inside those cells, they produce too much abnormal myelin. In mice, that damaged nerve fibers. In people aged 70 to 82, lower NRF2 tracked with steeper cognitive decline.
Several drug programs aim to boost myelin in aging brains, and this finding suggests that approach could backfire.
The human data is observational. Mouse experiments support a cause, but while a drug targeting the NRF2 pathway is already used in people for multiple sclerosis, none has been tested in these cells. The answer is still open.
Daily Brain Exercise
 
Missing Vowel
Word recognition is how your brain reads words from partial clues. See how sharp your instincts are today.
Play Missing Vowel →

Score Your Sleep in Five Questions

Five yes-or-no items

Two or more points means your deep sleep is shorting you

Grab a pencil. Give yourself one point for each of these.

☐  You wake between 2 and 4 AM more nights than not.

☐  Your mind starts running the moment your eyes open.

☐  You feel wired and tired at the same time.

☐  Mornings need two coffees before you feel sharp.

☐  Your best sleep happens after the alarm goes off.

Zero or one point… your nights are fine. Two or more, keep reading.

Here is what those points mean. Waking at 3 AM flips your body into stress mode.

Cortisol rises… and cortisol is the enemy of deep sleep. That is the stage where your brain runs its cleanup crew.

Most men reach for melatonin at this point. The data on that is thin. Meta-analyses show the pills add about 8 minutes of sleep. And a 2023 JAMA analysis found gummies carrying anywhere from 74 to 347 percent of the labeled dose.

Now the number that got my attention. In a lab-measured trial, a tart cherry approach added 84 minutes. That is roughly ten to one.

A short video shows the 30-second evening version. This video is made for a general audience… the protocol inside is the useful part.

Watch the method here

THE PROTOCOL:

WHEN: evening, about 30 minutes before bed.

DURATION: two weeks. Then re-take the audit above.

RULES: 30 seconds in the kitchen… and no, it is not cherry juice.

My verdict: at 30 seconds a night, worth the test. 

See it here.

Research
 
Why Statins Make Your Muscles Ache
Millions of men take statins. Muscle pain drives many to quit. Until now, no one could show exactly why.
The answer came from Vancouver. Dr. Steven Molinarolo and colleagues at the University of British Columbia, along with the University of Wisconsin-Madison, found that statin molecules latch onto a protein in muscle cells and force open a channel that controls calcium flow. The university drew attention to the work this month.
Let me explain what happens inside the cell. Three statin molecules cluster inside a pocket of the calcium channel and pry it open. Calcium leaks out all the time. Think of a faucet jammed open, dripping all night. That slow, steady leak damages the muscle tissue around it.
The team studied atorvastatin, one of the most prescribed statins. But similar interactions may occur with others in the same family. Senior author Dr. Filip Van Petegem called it the first clear view of how statins activate this channel.
  In mice that could not tolerate statins, a Columbia University team tested compounds called Rycals that stabilize the calcium channel. The drugs stopped the leak and cut muscle weakness. It is a clear target for redesigning statins that spare muscle tissue.
The Rycal fix has only been tested in mice, so this is still research in progress. And the work focused on one statin. I believe this is the clearest picture anyone has drawn of why statins cause muscle pain. It points toward a fix that does not mean giving up the drug.
If you take a statin and your muscles ache, bring this study to your doctor.
University of British Columbia · Nature Communications · November 20, 2025
Worth Trying
 
Cut Your Daily Salt to One Teaspoon
Americans eat too much salt. The average is more than 3,300 milligrams of sodium a day, according to the CDC. The recommended ceiling is 2,300 milligrams. That is about one teaspoon of table salt.
A Fujita Health University study published in July found that mice on a high-salt diet performed worse on memory tests and withdrew from social contact. The salt disrupted prostaglandin signaling, a protective pathway built from fatty-acid molecules that helps brain cells communicate.
The 2026 Alzheimer’s prevention guidelines from the World Health Organization do not list sodium reduction among their recommendations.
It starts with one label.
The Protocol
When
Every meal.
Duration
Ongoing. The biggest changes tend to show within the first four weeks.
Rules
Aim below 2,300 milligrams of sodium a day. Most sodium hides in bread, deli meats, canned soups and restaurant meals. Rinse canned beans and vegetables before cooking. Cook at home when you can.
 
Watch your blood pressure for a month and see if the numbers move. Start with the next meal you cook.
Lab Notes
Daily Blueberries Shifted Gut Bacteria in Older Adults With Mild Depression
The sample was tiny. Hebrew SeniorLife ran a pilot with 18 sedentary adults aged 65 and older. Ten took blueberry powder, equal to about two cups of fresh berries, every day for three months. The blueberry group showed shifts in gut bacteria genes. But mood scores did not reach statistical significance. A larger trial would tell us more.
Journal of Nutrition, Health and Aging · October 2026
A Blood Test Can Now Stage Alzheimer’s as Accurately as a Brain Scan
This is an update. On October 14, new Alzheimer’s blood tests made the news. Now a Samsung Medical Center team has found two tau protein fragments in blood plasma. Those fragments rise at distinct stages of the disease. In 1,263 participants, the markers matched brain-scan accuracy for staging. The test still needs validation in more diverse populations before it can reach a clinic near you.
Nature Communications · October 2026
A Prenatal Plasticizer Mix Was Tied to a 3-Point IQ Drop
Chemical exposure starts early. An INSERM team at Grenoble Alpes University measured plasticizer levels in pregnant women and tested their children’s intelligence at age three. Each step up in a mix of two bisphenols and four phthalates was tied to a drop of about 2.86 IQ points. The study is observational and does not prove cause. But it adds to the case that chemical exposures may shape brain capacity from before birth.
Environmental Health Perspectives · October 2026
The Debate
Statins and the Brain
Side A
The vascular case is strong. Statins lower cholesterol and calm inflammation in blood-vessel walls. Your brain depends on steady blood flow for oxygen and glucose. If the supply lines stay clear, the brain stays fed. The 2024 Lancet Commission lists high cholesterol as a modifiable risk factor for dementia. Several observational studies link statin use to lower dementia rates. An Oxford review found more than 98 percent of people who qualify face low risk of serious muscle problems. And today’s statin finding may remove a barrier: if a compound can stop the muscle pain, more people could stay on the drug long enough to benefit.
Side B
Your brain uses cholesterol to build myelin and cell membranes; the FDA flagged memory complaints on statin labels in 2012; and large randomized trials have tested whether statins help or hurt cognition over the long run.

© 2026 Better Brain. Not medical advice. Talk to your doctor before changing anything.