Some People Get Dramatically Better

When you walk out of the appointment where somebody tells you your mom has dementia, you are usually handed a prescription and a follow-up date six months out, and that is about all. Nobody sits down with you and explains what is actually happening inside her brain, or what any of it has to do with the way she has been eating and sleeping and moving for the last thirty years. And so most families walk out believing the same thing — that a decision has been made about their loved one, and there is nothing left to do now but wait and watch it happen.

There are two things that are true instead, and almost nobody tells you either of them.

The first is that some of what looks like dementia is not dementia at all, and it reverses completely once somebody finds it. Low B12. A thyroid nobody checked. A medication that has been quietly fogging her for two years. Every one of those produces confusion and memory loss and personality change that reads exactly like early Alzheimer's, and every one of them can be fixed.

The second is that in people who genuinely do have dementia, the way they eat and move and sleep changes how well their brain works. Not a little, and not just in theory. Some people improve dramatically. Not everybody, and nobody can tell you in advance who — but it happens often enough, and in enough different places, that "there's nothing to be done" is simply the wrong answer.

What separates the people who improve from the people who don't is usually how early they started, and how seriously they took it.

Start with the things that look like dementia and aren't

Do this part first, because it is the fastest and because it gets missed constantly. Everyone — doctors included — sees grey hair and forgetfulness and stops looking any further.

Vitamin B12. Our ability to absorb it drops as we get older, and metformin and the acid reducers that so many older people take make it worse. When it gets low it causes memory problems, confusion, unsteadiness on the feet, and changes in mood and personality. It is a simple blood test, and correcting it can bring somebody a long way back. How far depends a great deal on how long it went unnoticed, which is the reason to ask for the test now rather than at the next visit.

Thyroid. An underactive thyroid makes a person slow, flat, foggy, and uninterested in things she used to care about. It reads as dementia to almost anybody watching. It is also a blood test, and it is treatable.

The medicine cabinet. This one is enormous and it is sitting right under everybody's nose. A whole category of common medications — many older antihistamines, bladder medications, certain antidepressants, most over-the-counter sleep aids — have what is called an anticholinergic effect, which means they block the very brain chemical that the dementia medications are trying to preserve. Two different doctors can each prescribe something perfectly sensible and still leave your mother on a combination that fogs her badly. Sleeping tablets and anxiety medications in the benzodiazepine family do their own version of the same thing.

Gather up every bottle in the house, including the ones from the drugstore shelf, and take the whole pile to one pharmacist or one doctor, and ask them straight out whether anything in it is adding to her confusion. Pharmacists are very good at this and it costs you nothing. Please do not stop anything on your own — some of these are genuinely dangerous to stop suddenly — but do ask the question. Getting a handle on the whole medication list is worth doing properly, and I wrote about how in Managing Medical Care When You Aren't a Doctor.

And then a few more worth ruling out: dehydration, a urinary tract infection, untreated sleep apnea, depression, and hearing loss that nobody has corrected. Every one of them can look like decline. If confusion comes on suddenly, over hours or a day or two, that is something different again and it is an emergency — I wrote about how to tell the difference in Dementia or Delirium?

What the research actually found

Two large studies are the reason I am able to write any of this down.

The first was called FINGER, done in Finland and published in The Lancet in 2015. They took more than a thousand older adults who were at risk of decline and put them through two years of structured exercise, real coaching on how to eat, cognitive challenge, and close attention to blood pressure and blood sugar. At the end of the two years, the group that did the program scored measurably better on tests of thinking and memory than the group that did not.

The second is US POINTER, published in JAMA in July of 2025. This is the American version, run by the Alzheimer's Association across five sites with more than two thousand people in it. Everybody in the study was given advice about lifestyle. Half of them were also given a structured program — exercise they were actually prescribed, a specific way of eating, regular cognitive work, and a team keeping an eye on their health numbers. After two years, the structured group had done better.

And here is the part worth holding onto. The structured group was not being compared against people who did nothing — everybody in that study got advice, and everybody was trying. What the numbers showed is that doing this seriously beat doing it casually, by enough to measure. The effort itself is what moved the needle. And effort is the one thing available to absolutely anybody, at any budget, starting this afternoon.

Alongside those two, the 2024 Lancet Commission — which is the closest thing this field has to an authoritative summary — identified fourteen things that raise the risk of dementia and can be changed. Hearing loss, high blood pressure, physical inactivity, isolation, depression, diabetes, air pollution, untreated vision loss, drinking, and others. Their conclusion was that addressing those fourteen could prevent or delay as much as 45 percent of dementia worldwide.

Where your loved one is in all of this changes what you should be aiming at, and both versions are worth having.

Early on, you are protecting thinking and memory, and that is where the strongest results in the research are. Further along, the wins look different and they are worth every bit as much — steadier moods, better sleep, fewer hard afternoons, and keeping the ability to walk and dress and feed herself for months or years longer than she otherwise would have. Exercise studies in people who already have dementia show exactly those gains. Anybody who has lived through a bad stretch of this will tell you those are not small things.

Food

The pattern with the most research behind it is what gets called the Mediterranean or MIND way of eating. Vegetables, and especially leafy greens. Berries. Olive oil, nuts, beans, fish, whole grains. Not very much red meat, fried food, pastry or sugar.

Here is the thing the research keeps showing, and it is the most useful sentence on this page: every large study that improved people's thinking changed more than one thing at once. The food and the walking and the sleep and the blood pressure, all together. That is good news, because it means you are never relying on one change to carry the whole weight. Feed her well, get her moving, sort out her sleep — and the pieces add up in a way that no single one of them does alone.

Two specific things matter more than most people realize, and they get missed.

Protein. Older adults need more of it than you would think, and they very often eat far less, because appetite falls away and cooking gets hard and meals shrink down to toast and tea. Losing muscle costs a person her mobility, and mobility is what independence is made of, and weakness is what makes a fall likely. Try to get protein into every meal rather than just dinner — eggs at breakfast, something with lunch.

Water. Thirst stops being a reliable signal as people get older, and even mild dehydration produces confusion that looks like decline. A great many older people are quietly a little dehydrated most of the time.

Supplements, and what the evidence says

Test first, then correct. B12, folate, and vitamin D are all worth testing, and if a level comes back low, correcting it is genuinely valuable.

There is good evidence for a few things. In people with mild cognitive impairment who also have raised homocysteine — that is an inflammation-related marker you have to ask for specifically — B12 and B6 and folate taken together slowed the rate at which the brain was shrinking on scans, in the Oxford research known as VITACOG. The test is cheap and it is worth asking for by name.

A plain daily multivitamin improved cognition in the COSMOS trials. That is real randomized evidence, and a multivitamin costs almost nothing.

Omega-3 has the best support in people still at the at-risk stage, which is the moment to take it.

And then the ones that are sold hardest. Coconut oil, ginkgo biloba, and the branded reversal programs that bundle thirty supplements together and charge thousands of dollars. There is no trial evidence that any of them reverses dementia. I mention it because families spend money they do not have on these at the exact moment when they are least able to stand back and judge a claim. If somebody promises you reversal, that is how you know.

Movement, which is the one I would not skip

If you take only one thing off this page, please make it this one.

Exercise has more consistent support behind it than anything else in this entire field. It increases blood flow to the brain, it improves the body's handling of blood sugar, it lowers inflammation, and it raises a protein called BDNF that helps brain cells survive and grow. In people who already have dementia it improves physical function, mood, and sleep — which, when you think about what actually makes a hard day hard, is most of it.

What counts is about 150 minutes a week of something that gets the heart rate up and makes it a little harder to hold a conversation. Brisk walking is enough. Add some resistance work twice a week — bands, light weights, or simply standing up out of a chair over and over — because muscle is what keeps a person on her feet. And add something for balance, because a fall is the single event most likely to end somebody's independence, and there is a great deal you can do about that around the house as well (the home-safety walkthrough is here).

Something every day beats one heroic effort on a Saturday. And if you walk with her, you get the benefit too, which matters more than you think it does right now.

The three that get skipped

Sleep. The brain clears out its own waste products, including amyloid, mostly during deep sleep. Untreated sleep apnea is very common in older adults, very often undiagnosed, and treating it can noticeably improve how somebody thinks during the day. Snoring plus daytime sleepiness is worth raising with the doctor.

Hearing. Untreated hearing loss is one of the biggest changeable risk factors on the Lancet list, for two reasons. Straining to hear uses up the mental effort that was meant to go to everything else, and people who cannot follow a conversation stop joining in, and the isolation does its own damage. The evidence that hearing aids help cognition is strongest in exactly the people we are talking about here. Push for it.

Blood pressure. Treating it properly lowers the chance of cognitive impairment later. The small vessels in the brain take the damage first, and quietly, and you get no warning at all.

Why the medications don't get at the cause

This is worth understanding plainly, because it changes what you should expect from them.

Donepezil, rivastigmine, galantamine, and memantine — the medications almost everybody is given — do not slow the disease down. They were never designed to. The first three keep a signalling chemical called acetylcholine hanging around longer in a brain that has stopped making enough of it, and memantine quiets a different signal that has become overactive. It is the difference between repairing a failing generator and turning up the lights it is still managing to power.

They can help. Some families notice steadier attention, a bit more engagement, an easier afternoon. Others notice nothing at all. The benefit is modest, it fades as things progress, and it does nothing about the underlying damage. That is not a scandal — it is exactly what the label says. It is simply that nobody explains it, so families are left assuming the prescription is doing more than it is.

The newer antibody drugs, lecanemab and donanemab, are a different thing, and it would not be fair to lump them in. They genuinely do target a cause — they clear amyloid out of the brain, and the scans show it plainly. In people with early Alzheimer's they slowed decline compared with placebo.

But be clear-eyed about what slowing means here. The difference between the treated and untreated groups after eighteen months was small — real on a statistical test, and hard to see across a kitchen table. They require infusions, a scan first to confirm there is amyloid there at all, and repeated MRIs afterward, because a meaningful number of people develop swelling or small bleeds in the brain. They are expensive, and most people with dementia are not eligible for them.

So the older medications manage symptoms and never claimed otherwise. The newer ones go after a cause and buy a modest amount of time, at real cost and real risk. And neither of them is doing a single thing about blood flow, or fuel, or inflammation, or sleep.

That is the ground you are standing on, and it is a great deal larger than anybody told you.

What is actually happening in there

Alzheimer's usually gets explained with two words, plaques and tangles. Plaques are clumps of a protein called amyloid that build up between brain cells. Tangles are a different protein, tau, twisting up inside them. Both are real and both are visible, and for thirty years almost all the research money went into clearing them out.

That picture turned out to be incomplete in a way that matters enormously to you.

Most dementia in older people is not pure Alzheimer's. When researchers look at the brains of people who died with dementia, most of them show mixed changes — amyloid and tangles, yes, but alongside damage to the small blood vessels from years of high blood pressure, or the protein deposits of Lewy body disease, or scarring from strokes so small that nobody ever noticed them happening. The person had one diagnosis. Her brain had three things going on at once.

That matters because those other things are the ones that answer to how somebody lives. And underneath all of it sit three processes, which is where food and movement get their grip.

Blood flow. The brain is about two percent of your body weight and it takes roughly twenty percent of your blood supply, and it holds almost nothing in reserve. Anything that narrows or stiffens the small vessels — high blood pressure, diabetes, smoking, years of sitting still — starves tissue that cannot afford to wait.

Fuel. Brain cells run on glucose, and in Alzheimer's their ability to take it in starts falling years before any symptom shows up. Some researchers have taken to calling it type 3 diabetes, which overstates it, but the observation underneath is solid — the brain's energy supply is disrupted early, and insulin resistance in the body tracks right along with it.

Inflammation. The brain has its own immune cells, and in dementia they get stuck in a permanently switched-on state and begin damaging the very tissue they exist to protect. What keeps them switched on includes poor sleep, belly fat, gum disease, and long-running low-grade infection. This is also where the research on the gut is pointing, because inflammation that starts in the body does not politely stay in the body.

Not one of those three is a plaque. All three of them answer to what a person eats, how she moves, and how she sleeps. And that is the whole reason the rest of this page works.

What this does and does not mean

It does not mean anybody caused this by eating the wrong things. Age and genetics and plain luck do most of the work here, and there are people who did everything right and got dementia anyway. If you are looking for something to feel guilty about, this is not it, and I would gently ask you not to make it that.

What it means is that the path is not already decided. Several of the things pushing it along are things you have some say over. And the sentence most families walk out of that appointment believing — that there is nothing to be done — is not true.

Some people get dramatically better. The tools are not exotic ones. Food, movement, sleep, hearing, blood pressure, and an honest look at what is in the medicine cabinet.

Where to start this week

You cannot do all of this at once and I would not want you to try. Pick two.

1. Get the blood work done. B12, folate, thyroid, vitamin D. It is one draw, and you can ask for it over the phone.
2. Take every bottle in the house to a pharmacist and ask what is adding to the fog.
3. Get her hearing checked if it has been more than a year.
4. Walk together, every day. Twenty minutes. You get the benefit too.
5. Protein at breakfast, not just at dinner.

Keeping a record of what you changed and what happened afterward is most of how you will ever know whether any of it is working. Somewhere to write down the medication list, the test results, and what a good day and a bad day actually looked like turns "I think she seems a little brighter" into something you can put in front of a doctor and be taken seriously about. Family Harbor keeps all of that in one place your whole family can see and add to, so you are not the only one holding it — though a notebook and a shoebox will do the same job if you are disciplined about it.

Resources

• National Institute on Aging — plain-language guidance on dementia, from the NIH
• Alzheimer's Association — 24/7 helpline, 800-272-3900
• Eldercare Locator — connects you to services near you, 800-677-1116

Reviewed September 2026. This is information, not medical advice, and it is no substitute for the doctor who actually knows your mother — particularly before starting, stopping, or changing any medication.

Get the blood work done, and take the bottles to a pharmacist. Those two, this week, before anything else on this list.