Home › Neurology > Women's Cognitive Health

Tokyo Geriatrician Reveals: Why Women's Brains Are Failing At Twice the Rate of Men's (And The Awful Immune System Discovery That Explains Everything)

The woman sitting across from me was 61 years old.

She had been a university professor. She spoke three languages. She had published two books.

She could not remember what she had eaten for breakfast.

Her daughter sat beside her, holding her hand, doing the thing I have seen a thousand daughters do — finishing her mother's sentences when the words stopped coming.

Smiling as though nothing was wrong. Holding everything together while everything fell apart underneath.

In 26 years of geriatric practice in Tokyo, I have watched this scene play out hundreds of times... Brilliant women. Strong women.

Women who built lives around their minds — losing those minds piece by piece while their families watched.

And for most of my career, when a daughter asked me, "Why is this happening to her?" I gave the answer every geriatrician gives. She is aging. The brain deteriorates. We will manage her symptoms as best we can.

Three years ago I stopped giving that answer. Because I found the real one. And it had nothing to do with aging.

The real reason two out of every three Alzheimer's patients are women has nothing to do with lifespan. It has to do with a part of your biology that was designed to protect you working against you.

Let me explain what I mean by that. Because when I first encountered this research, I did not believe it either.

Your body has an in-built defence that has protected you your entire life. Every infection you fought off. Every virus you survived. Every wound that healed. That defence has kept you alive even while other people around you got sicker, and recovered slower.

You may have noticed this already but women recover from illness faster than men. This plays a huge part in why we live longer, on average, by five to seven years.

There is a reason for that. Women simply have stronger immune systems. This is backed by tons of established, documented biology.

But it’s your unique immune system strength as woman, that’s slowly eating at your brain.

Here is how. Deep inside your brain, your immune system produces a protein called amyloid. 

For decades, the medical world treated amyloid plaque as the villain of Alzheimer's disease. The toxic buildup. The thing that kills your brain cells.

But Harvard researchers have suggested something that changes everything we thought we knew:

Amyloid is NOT the villain. It’s a protective helper.

See, your brain produces Amyloid to fight infections, neutralise toxins, and protect itself from invaders. It is supposed to be there. It is your brain's shield.

The problem is how much of it a woman’s immune system makes compared to a man’s.

Comparison: Amyloid density on a 58 year old man's brain on the left and a 58 year old woman's brain on the right.

While your brain is busy overproducing Amyloid in an effort to protect you — nothing is working hard enough to clear the excess.

So it builds. Year after year. Layer after layer. Think of it like snow accumulating on a roof that no one shovels.

One winter is fine. But ten winters, fifteen winters, twenty years of buildup with no one clearing it — the roof sags slowly till it suddenly starts collapsing. And one morning you wake up to the ceiling caving in.

That is what is happening inside the brains of millions of women right now.

Not because they are getting older. Not because they did something wrong. 

Because the strongest part of your biology will not stop building a protein that your body can’t clear fast enough on its own.

This is why brain imaging studies like the one above show women between 40 and 65 already carrying higher levels of amyloid buildup than men of the same age.

This is why women in their 60s are more than twice as likely to develop Alzheimer's over the rest of their lives as they are to develop breast cancer.

And this is why crossword puzzles barely work. Fish oil does not work. Ginkgo biloba does not work. Aricept — for hundreds of dollars a month — does not work.

Because none of them address the Amyloid overproduction.

Chronic neuroinflammation causes progressive cognitive decline as neural connections are damaged

Why Western Medicine Has No Answer For This

I must tell you something about my training, because it explains why I see this differently than most Western doctors.

I trained in two systems of medicine. Western neurology and geriatrics — the same training any doctor in London or New York or Sydney would receive. And Kampo — Japan's system of traditional plant-based medicine.

In the West, these are treated as entirely separate worlds.

Conventional medicine on one side. "Alternative" medicine on the other. And the two do not speak.

In Japan, they are not separate. Kampo is fully integrated into mainstream medical practice. It is taught in Japanese medical schools. It is prescribed by licensed physicians. It is covered by our national health insurance.

A Japanese geriatrician prescribing a medicinal mushroom compound alongside a conventional treatment is not practising alternative medicine.

In our world it’s simply just practising medicine.

It sits in published research journals while doctors in the western world prescribe five-hundred-dollar-a-month drugs that manage symptoms, and never once address the immune system overproduction that is causing the damage in the first place!

Turkey Tail mushroom extract was approved in Japan as a clinical complement to cancer treatment decades ago.

It is prescribed alongside chemotherapy in Japanese hospitals to this day. It passed clinical trials.

It modulates the immune system — calms it where it is overactive, supports it where it is weak — without the devastating side effects of immunosuppressant drugs.

Reishi (Ganoderma lucidum) — known in Japanese medicine as the mushroom of immortality — has been prescribed in Kampo practice for over a thousand years for immune regulation also.

This concept — immunomodulation — is the foundation of how Japanese medicine approaches the immune system. And it is the exact concept that Western Alzheimer's research is still so behind on. 

Explaining the drastically higher rates of brain disorders in the western world.

The clinical tradition of using them exists and has existed for centuries.

What does not exist is a financial incentive for any Western pharmaceutical company to tell you about them.

So nobody tells you. And your brain continues to drown in a protein designed to protect you that won't stop producing.

The Four Compounds I've Used To Help Thousands of Women Restore Their & and Sharpness

Timeline of medicinal mushrooms reversing amyloid overproduction and restoring brain function

When I explain this to patients in my clinic, I do not hand them a complicated protocol. I explain it the way I am about to explain it to you.

The damage from Amyloid happening in your brain has four layers. Each layer requires a different intervention.

And each one maps to a specific mushroom compound that has been studied, published, and used in Japanese medicine for generations.

Layer 1 — Stop the overproduction.

If you do not address this, nothing else matters. Reishi is one of the most studied natural immunomodulators in existence.

It tells your immune system to produce only the necessary amounts of amyloid.

Layer 2 — Support the clearance

Your body has natural cleanup processes — designed to identify and clear waste in the brain.

Turkey Tail (the same compound that Japan approved along chemotherapy) helps boost the cleaning machinery in your body that's been buried under years of excess production.

Layer 3 — Calm the inflammation

Excess amyloid triggers a chronic inflammatory response in the brain because your immune system detects that buildup as a new threat to attack.

Chaga mushroom addresses the damage that the amyloid buildup is actively causing and fights it to support cognitive decline and memory loss.

Layer 4 — Repair the loss.

After stopping Amyloid overproduction, clearing waste and healing inflammation it's time to address the repair.

Lion's Mane directly stimulates the production of Nerve Growth Factor (the protein your brain needs to repair damaged neural connections and grow).

Why these work best for cognitive decline ONLY when combined

I must address something here, because I see this mistake constantly.

Women read about Lion's Mane and buy a bottle of Lion's Mane capsules. Or they read about Reishi and buy Reishi tea. Hoping it will be enough.

It will not be enough. And here is why.

Each of these compounds addresses a different layer of the same problem.

Taking Lion's Mane alone won’t rebuild neural connections if the brain is still drowning in Amyloid plaque.

Taking Reishi alone slows the overproduction but does nothing about the fifteen years of accumulation already there.

These four compounds are ONE system. They were designed — by nature, and refined by centuries of Kampo practice — to work together.

That is how I prescribe them in my clinic. That is how the research supports using them. And that is how you should be taking them.

What I Tell My Patients

I do not tell them this will cure Alzheimer's disease. No compound on earth magically cures Alzheimer's disease. Any product that claims otherwise is lying to you, and I want no part in that.

What I tell them is this:

Your brain is under assault from a protein your own immune system is overproducing.

And for the first time, you can address it directly — without a drug that masks the symptoms while the underlying damage continues unchecked. 

And I tell them to start now. Not next month. Not after their next doctor's appointment.

Now. Because every month the amyloid overproduction continues unchecked is a month closer to damage that becomes very difficult to address.

What I've seen in the last three years

I am a clinician. I am cautious by nature and by training. I do not make claims I cannot support with observation. Here is what I have observed:

The women who begin in their 50s and early 60s, while the brain fog and memory loss is still something they shrug off as stress, or poor sleep or "just getting older" — those are the women who report the most noticeable changes.

The first thing most of them report is deeper, less interrupted sleep within the first two weeks. This is consistent with what we know about Reishi's effect on immune-mediated sleep disruption.

The second is a subtle shift they struggle to describe at first. One of my patients called it "the volume turning back up." 

Conversations easier to follow. The world feeling sharper. Colours more vivid. Like a return to something they did not realise they had been missing.

By week four to six, the changes become harder to dismiss as coincidence.

Words come easier. Thoughts complete easier.

The anxiety that something is wrong every time they forget a word or lose a train of thought — begins to lift.

One of my patients, who’s a retired school principal, told me after eight weeks:

"I feel like I've been living behind a dirty window for years and someone finally cleaned it. Life just has so much color now? I'm always doing my makeup, going out and actively making conversation. I'm a people person but my insecurity about my forgetfulness was really hurting my relationships."

Another — a 58-year-old executive in a prive bank whose mother died of Alzheimer's at 71, came to me terrified that she was watching her own future unfold.

After twelve weeks on this protocol she told me: "Listening to me is the best decision she’s made for her health in years."

I want to be careful here. These are individual experiences. Every woman's biology is different, and I cannot promise you will feel exactly what these women felt.

But I can tell you — as a physician who has treated cognitive decline for 26 years — that I have never seen this pattern of consistent, early-stage improvement from any protocol I have recommended before. 

Clinical studies validating the therapeutic effects of medicinal mushrooms on brain health and cognitive function

I practise medicine in Tokyo. My patients are Japanese women and the rare expat. They have access to Kampo medicine as a standard part of their healthcare.

They can walk into any major hospital in Japan and find a physician trained in both Western neurology and medicinal mushroom therapeutics.

Finally, there is a product available in the West that contains all four proven compounds — Reishi, Turkey Tail, Chaga, and Lion's Mane — in precise extract form, at dosages consistent with the published research I use in my own clinical practice.

It is called Sky Nutrition Ultimate Mushroom Daily Gummies.

I have reviewed the formulation. I have checked it against the studies. I have recommended it to several women in the west and heard amazing experiences.

It is the closest product I have found to what I recommend to my patients in Tokyo, if not better. Two gummies. Every morning.

They offer a 90-day money-back guarantee. A full refund if you feel nothing.

NOTE: That is more confidence and integrity than pharmaceutical companies will offer you for drugs that cost ten times as much and address none of what I have described here today.

Stocks runs low regularly due to high demand.

What happens if you don't do anything?

The amyloid buildup in your brain is happening right now. It did not start last year. It has been building since your 40s.

Every year of unchecked overproduction adds another layer. Every year without intervention narrows the window.

The women who come to me in their early 50s — the ones who notice the fog, acknowledge it, and act — those women have options. Real, meaningful options. 

Their brains are still capable of responding powerfully to the support these compounds provide.

The women who come to me at 70 — after two decades of accumulation, after the diagnosis, after the children have already had the quiet phone call about "what we should do about mum" — those women I can help less. 

I am not telling you this to create panic. I am telling you because you have spent your entire life being told comfortable lies by a medical system that profits from managing your decline rather than addressing its cause.

You deserve the truth. And the truth is that time matters.

If you are forgetting words mid-sentence — time matters.

If you are writing lists you never used to need — time matters.

If you are arriving early to gatherings so you can read faces before you have to say names — time matters.

If you watched your mother or a loved one go through this and you are quietly terrified that you are watching the first act of your own decline — time matters.

You are in the crucial window to address it. Today. Right now.

Stocks runs low regularly due to high demand.

Scientific References

The information in this article is supported by peer-reviewed scientific research. Below are the sources referenced:

Comments

THIS IS AN ADVERTISEMENT AND NOT AN ACTUAL NEWS ARTICLE, BLOG,

OR CONSUMER PROTECTION UPDATE

MARKETING DISCLOSURE: This website is owned and operated by Sky Nutrition.

Statements made on this website have not been evaluated by the U.S.

Food and Drug Administration. These products are not intended to diagnose,

treat, cure, or prevent any disease. Information provided by this website or

this company is not a substitute for individual medical advice.

© 2025 All Rights Reserved.

THIS IS AN ADVERTISEMENT AND NOT AN ACTUAL NEWS ARTICLE, BLOG,

OR CONSUMER PROTECTION UPDATE

MARKETING DISCLOSURE: This website is owned and operated by Sky Nutrition.

Statements made on this website have not beenevaluated by the U.S. Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Information provided by this website or this company is not a substitute for individual medical advice.

© 2026 All Rights Reserved.