The Biohacker’s Crack
Bryan Johnson sells longevity.
He posts bloodwork. He obsesses over protocols. The goal? Defy aging, or at least look like you do. It’s a performance. A viral spectacle.
But Monday changed the script.
Johnson shared news that cracks the perfect health facade. After months of crushing fatigue, he got a diagnosis: autoimmune gastritis. His own description? The stomach eating itself.
Not glamorous. Not “optimized.” Just… broken.
It’s not the headline autoimmune condition everyone knows, but it’s everywhere. And it’s invisible until it isn’t. If your doctor says your labs are “normal” despite your fog, your exhaustion, or that nagging anemia… keep reading. You might have a blind spot in your health narrative.
It’s Not What You Think
Let’s clear up the confusion. Most gastritis comes from H. pylori bacteria. You get antibiotics. It clears up. Simple.
Autoimmune gastritis is different.
There is no infection. No bug to kill. Here, your immune system loses its mind. Specifically, it targets parietal cells.
What do they do? These tiny workers in your stomach lining produce acid. More importantly, they make intrinsic factor. This protein is the key. Without it, your body cannot absorb vitamin B12.
Your body decides parietal cells are invaders. It attacks them. Over years—quietly, insidiously—these cells die. They’re replaced by scar-like tissue.
Result? No acid. No intrinsic factor. Your digestion starves of its own tools.
It usually hits the body of the stomach. It doesn’t spread like a wildfire. It burrows deep.
The Symptom Mirage
Do you feel sick? Maybe not.
Many people have zero symptoms in the early stages. Nothing to see.
Then, slowly, the fog rolls in. Bloating. Heartburn. A vague “offness.”
Sound familiar?
We chalk it up to stress. Bad pizza. Too little sleep. But here is the trap: doctors might prescribe acid reducers. PPIs. The irony? Your stomach already has too little acid. These pills don’t fix the cause; they might actually worsen the downstream effects by stripping away what little acid you have left.
The condition is a master of disguise. It hides.
Often, it’s found by accident. You go in for an unrelated endoscopy. A pathologists peers at a biopsy slide and spots the damage. Only then do you realize you’ve been living with an immune storm for years.
Why is recognition so poor?
The lack of specific symptoms leads to delays that cascade into systemic issues.
When The Dominoes Fall
The stomach isn’t where the story ends.
When B12 absorption fails, the body pays. B12 isn’t just about energy. It’s about nerves. Brain. Blood.
First comes the iron deficiency. Less acid means less iron uptake. You feel tired. Lightheaded. Anemic. This often appears before the B12 crisis. If you’re an adult with no clear reason for iron loss (menstruation, etc.), this is a red flag. 🚩
Then, the pernicious anemia sets in. This is the classic hallmark of the disease.
But it gets neurological.
Numbness in your fingers? Tingling toes? Brain fog that won’t lift? Memory slipping through your fingers like sand? These aren’t just “aging.” They are signs of long-term B12 starvation affecting the nervous system. Mood changes follow. Anxiety. Depression. The body turns on itself, inside out.
And there’s a longer shadow.
Research indicates a slightly increased risk of stomach tumors. Specifically, neuroendocrine tumors. The rate is low (around 2.8% per year for certain tumors, less for cancer) but it’s a non-zero number. It means surveillance matters.
Who Is On The Hook
Does gender matter? Yes.
It’s more common in women. Middle age is the usual suspect, but it can hit younger folks. Roughly 0.3% to 2.7% of us have it. That sounds small until you do the math. It’s thousands. Maybe millions. Undiagnosed.
Autoimmune disease clusters. That’s how it works.
Have Hashimoto’s thyroiditis? Type 1 Diabetes? Your risk jumps. Your immune system is already primed for error. One glitch leads to another.
Clinical guidelines say: if you have this stomach condition, check the thyroid. If you have the thyroid issue, keep an eye on the stomach. They travel in pairs. Or trios.
The Diagnostic Gap
Blood tests. Biopsy.
It sounds simple. It isn’t.
Doctors look for anti-parietal cell antibodies. These are the missiles your body fired at itself. They check B12. They check ferritin (iron stores).
But the gold standard? Tissue. An upper endoscopy pulls a sample from the lining. A pathologist looks for atrophy. For metaplasia.
Here is the frustration.
Because the bloodwork can be patchy—and B12 levels can look normal for a long time despite tissue damage—the diagnosis slides by. Years slide by. You feel like you’re crazy. The numbers don’t add up. The symptoms don’t match the textbook.
You need a detective. Or luck.
Damage Control, Not Repair
Can we reverse it?
No. The scar tissue doesn’t undo itself. The immune system doesn’t suddenly decide to chill out. There is no cure for the root cause.
But. You can manage the fallout. Hard.
B12 injections. This is non-negotiable for many. Pills bypass the issue; injections go straight to the blood. High-dose sublingual supplements are the alternative if shots are impossible. Ask your doctor. Do not guess.
Iron. Supplement. Monitor. Treat the anemia aggressively. It lifts the fog. It restores the blood.
Watch the acid drugs. If you take Omeprazole or similar, talk to your doc. You might not need them. You might need something else to manage reflux that doesn’t tank your remaining acid.
Surveillance. Endoscopy on a schedule. Catch those tiny tumors early, if they form.
Check the neighbors. Screen for thyroid issues. Type 1 diabetes markers. If your body attacks the stomach, where will it strike next?
The Open Question
Bryan Johnson wanted to control his biology. He measured everything. He still got hit.
Maybe the body is more unpredictable than we think.
Or maybe we’ve just been ignoring the quiet failures until they scream.
If you have that unexplained fatigue. That persistent anemia that baffles the lab. The neurological zings.
Don’t let “normal labs” dismiss you.
Ask for the antibody test. Ask for the biopsy.
What are you ignoring in the name of “stress”? 🧠
