Reza Hosseini Ghomi, MD, MSE

I lost a patient to dementia who had no usual risk factors.
 
No high blood pressure. No diabetes. No history of head injury. Active. Educated. Mediterranean diet.
 
What he had was loneliness.
 
His wife died 4 years before I met him. He had three adult children who all lived in different states. He told me, with a sad smile, that he could go a week without speaking to another person.
 
He was already showing early signs of cognitive decline at his first visit. I did everything I could clinically. But I knew the deeper problem was not something I could fix in 30 minutes.
 
Loneliness is one of the most underestimated dementia risk factors we have.

A 2024 meta-analysis published in Nature Mental Health pooled data from 21 longitudinal cohorts and more than 600,000 people. It found that loneliness raises overall dementia risk by 31%, Alzheimer's risk by 39%, and vascular dementia risk by 74%. The effect size is comparable to physical inactivity or smoking.
 
In the Framingham Heart Study, loneliness was associated with a ~50% increased 10-year risk of dementia, with even higher risk observed in certain subgroups. Across studies, the magnitude of risk associated with loneliness is similar to that reported for other major dementia risk factors, including carrying a single APOE4 allele.
 
Read that again. The way you spend your social time may affect dementia risk on a similar order of magnitude as your genetics.
 
Here's why loneliness wrecks the brain:
 
1. Chronic stress floods the brain with cortisol
↳ Long-term cortisol exposure shrinks the hippocampus
↳ The hippocampus is the part of the brain most vulnerable to Alzheimer's
 
2. Lonely people sleep worse
↳ Worse sleep means worse amyloid clearance
↳ Worse amyloid clearance means more dementia risk
 
3. Lonely people exercise less
↳ Lonely people drink more
↳ Lonely people skip preventive care
↳ All of these stack on top of each other
 
4. The brain literally rewires for threat
↳ Lonely brains scan more for danger and less for opportunity
↳ This pattern is associated with structural changes on MRI
 
Loneliness is not the same as being alone. Some people live alone and have rich social lives. Some people live with families and feel deeply alone.
 
What matters is whether you feel connected to people who matter to you.
 
If the answer is no, this is not a soft problem. It is a brain problem.
 
What I tell my patients:
 
Schedule the call you keep meaning to make.
Show up to the thing you keep saying you'll go to.
Volunteer somewhere. The brain benefits of giving are massive.
Ask for help if connection feels impossible right now.
 
You will not be a better friend, parent, or partner if your brain shrinks while you tough it out alone.
 
📌 Follow me (Reza Hosseini Ghomi, MD, MSE) for brain health that takes the whole person seriously
♻️ Repost to remind someone they matter
💬 Comment with the name of the person you're going to reach out to this week

I'm a brain doctor. I watch what dementia does to families.
 
I take my own brain seriously. Here are 5 of the things I do every day. Remember building habits takes time and best to focus on one at a time.
 
1. I get morning sunlight in my eyes
↳ I step outside within 30 minutes of waking
↳ 10 minutes is enough on a clear day
↳ This anchors my circadian rhythm, which improves sleep that night
↳ Sleep is when the brain clears Alzheimer's-related proteins
 
2. I move before I sit
↳ I do a short bodyweight routine or walk before opening my laptop
↳ Movement first thing primes blood flow to the brain
↳ Exercise boosts BDNF, which is fertilizer for new brain connections
 
3. I eat protein early
↳ My first meal is built around 30+ grams of protein split before and after I workout
↳ This stabilizes blood sugar, which protects against insulin resistance in the brain
↳ Stable blood sugar means stable energy and stable mood
 
4. I limit afternoon caffeine
↳ I cut off coffee by noon
↳ Caffeine has a half-life of 5 to 6 hours
↳ Late caffeine wrecks deep sleep, even if you can fall asleep
↳ Deep sleep is non-negotiable for memory consolidation
 
5. I close out the day with someone I love
↳ I make sure I have at least one real conversation every day
↳ Phone calls, dinner with family, time with friends
↳ Loneliness is a dementia risk factor on par with smoking
↳ Connection is medicine
 
These are not magic.
 
They are not expensive.
 
You don't need a wearable, a supplement protocol, or a longevity clinic to do them.
 
What they do require is consistency.
 
Small dials. Every day. For 30 years.
 
That's the formula.
 
I have seen too many families crushed by a dementia diagnosis to take any of these for granted. The earlier you start, the more the math works for you.
 
If you do nothing else, pick one of these and start tomorrow.
 
📌 Follow me (Reza Hosseini Ghomi, MD, MSE) for what brain doctors really practice
♻️ Repost to nudge a friend into a small daily habit
💬 Comment with the one you're going to start this week

I've been teaching residents and fellows for 12 years.
 
Most attendings will tell you it's a one-way street. The senior doctor passes down wisdom. The trainee absorbs it.
 
That's not what I've experienced.
 
Some of the sharpest insights I've gotten about my own field came from people who had been doing it for two months.
 
A few examples that stuck with me:
 
1. A first-year resident asked why we recommend a sleep study before diagnosing dementia
↳ I gave the textbook answer about reversible causes
↳ She pushed back: "But you only do it if the family mentions snoring. Why aren't we asking everyone?"
↳ She was right. I changed my workup permanently.
 
2. A nurse practitioner trainee questioned my reflex to start cholinesterase inhibitors
↳ I had been doing it for years on autopilot
↳ Her question forced me to look at the data again with fresh eyes
↳ I now have a more nuanced conversation with each family
 
3. A medical student noticed I rushed through care planning at the end of long visits
↳ "The diagnosis takes 5 minutes. The plan takes 30. You're giving it 3."
↳ I restructured how I run new patient visits because of that comment
 
Here is what I've learned about teaching that I wish I'd known earlier:
 
The trainee with the least experience often asks the most useful question.
↳ They haven't learned yet what they're "not supposed to" question.
↳ Protect that. Don't beat it out of them.
 
Your job is not to make them think like you.
↳ It's to make them think clearly.
↳ Those are different goals.
 
The best teaching moments happen when you say "I don't know."
↳ It models that medicine is a continuous learning process.
↳ It gives them permission to admit uncertainty later in their careers.
 
Most clinicians I know who left academic medicine cite the bureaucracy. The teaching is the part they miss.
 
I get it. Watching someone you trained make a great call on a hard case is one of the most satisfying things in this profession.
 
The pipeline of physicians caring for cognitive disorders is dangerously thin. We need every attending who has the bandwidth to take a trainee under their wing.
 
You will get more out of it than you put in.
 
📌 Follow me (Reza Hosseini Ghomi, MD, MSE) for honest healthcare leadership stories
♻️ Repost to thank a mentor or a great trainee
💬 Who was the mentor who shaped how you practice today?

Benzodiazepines are among the most prescribed medications in the United States.
 
Xanax. Ativan. Klonopin. Valium.
 
Millions of Americans take them for anxiety, insomnia, or muscle tension.
 
Many have been on them for years.
 
And long-term use is linked to a significantly increased risk of dementia.
 
A meta-analysis found that benzodiazepine use was associated with a 50% increased risk of developing dementia. The risk increased with longer duration and higher doses.
 
What benzodiazepines do to the brain over time:
 
Suppress deep sleep and REM sleep
↳ The exact sleep stages your brain needs for waste clearance and memory consolidation
↳ You feel sedated but your brain isn't getting restorative sleep
 
Impair executive function
↳ Planning, organizing, decision-making, impulse control
↳ The frontal lobe functions that decline look identical to early dementia
 
Create dependence
↳ Stopping abruptly is dangerous (seizure risk)
↳ Many patients can't distinguish between withdrawal anxiety and their original anxiety
↳ Tapering takes months and requires careful medical supervision
 
The diagnostic challenge:
 
I've evaluated patients referred for "possible dementia" whose cognitive impairment was substantially driven by years of benzodiazepine use.
 
Their executive function was impaired. Their memory was foggy. Their processing speed was slow.
 
After a careful taper (months, not weeks), their cognition improved meaningfully.
 
They didn't have dementia. They had a medication side effect that mimicked it.
 
I'm not saying benzodiazepines are never appropriate. Short-term use for acute anxiety or seizure disorders has clear clinical value.
 
But long-term daily use, especially in older adults, should be questioned.
 
If you've been taking a benzodiazepine daily for more than a few months, talk to your prescriber about alternatives and a safe tapering plan.
 
This is not something to stop on your own. But it is something worth a conversation.
 
📌 Follow Reza Hosseini Ghomi, MD, MSE for medication truths your doctor might not bring up
♻️ Repost if you think more people need to know about this
💬 Have you or someone you know been on a benzodiazepine long-term? Was anyone monitoring the cognitive effects?

Citation: Zhong G, Association between benzodiazepine use and dementia: a meta-analysis, PLoS One, 2015.

Your brain runs on glucose.
 
Until it can't.
 
One of the most consistent findings in Alzheimer's research is that the brain stops using glucose efficiently years before symptoms appear. Some researchers now call this Type 3 Diabetes, because the metabolic pattern looks so similar to insulin resistance in the body.
 
This is one reason why diabetes, prediabetes, and metabolic syndrome all dramatically raise dementia risk.
 
Here's what your brain wants you to know about your blood sugar:
 
1. Insulin resistance damages the brain
↳ The same process that hurts your kidneys and eyes hurts your hippocampus
↳ Type 2 diabetes roughly doubles the risk of Alzheimer's
 
2. Sugar spikes are not just a weight issue
↳ Repeated glucose surges drive inflammation and small vessel damage
↳ Small vessel damage in the brain accelerates cognitive decline
 
3. Your fasting glucose matters more than you think
↳ Fasting glucose in the high-normal range (95-105) is associated with brain shrinkage
↳ The "you're fine" zone for blood sugar may not be fine for your brain
 
4. The fix is mostly behavioral
↳ Walk after meals (even 10 minutes drops glucose meaningfully)
↳ Protein and fiber before carbs flatten the post-meal spike
↳ Sleep affects glucose almost as much as food
↳ Strength training improves insulin sensitivity faster than cardio
 
5. The medications that help diabetes appear to help the brain
↳ GLP-1 drugs (semaglutide, tirzepatide) are now being studied for Alzheimer's prevention
↳ Metformin has decades of mixed but interesting cognitive data
 
I'm not saying everyone needs to track their glucose with a continuous monitor.
 
I am saying that if you've been told your blood sugar is "borderline" or "a little high," your brain is paying attention even if your primary care isn't.
 
The earliest fingerprint of Alzheimer's may be a sluggish brain glucose uptake decades before any forgetfulness.
 
You don't see it. But it's there.
 
The good news: this is one of the most modifiable risk factors we know of.
 
📌 Follow me (Reza Hosseini Ghomi, MD, MSE) for brain-first medical insights
♻️ Repost to help someone connect the dots between metabolism and memory
💬 When was the last time you looked at your fasting glucose number?