Dr. Theoharis Theoharides is a physician and a PhD pharmacologist. He holds five degrees from Yale including an MD, spent 37 years on the faculty at Tufts University School of Medicine, and has published more than 500 peer reviewed papers on inflammation and mast cells. He was the first researcher to connect mast cells to autism. When he names a test or a dose in this episode, that is the researcher who did the work giving you clinical context.
Context is not a prescription. The right number for any individual child depends on age, weight, lab results, and everything else that child is already taking. Do not start, stop, or change anything because you heard it on a podcast. Bring it to your child's doctor and have the conversation there. If your doctor will not have that conversation, that is worth knowing too, and this episode has something to say about it.
With that said.
Dr. Theo is back, and this time we went straight at the stuff that has been all over the news. Leucovorin. Tylenol. Benadryl. Every few weeks another autism headline lands, and every few weeks a bunch of us are left working out whether it means anything for our kid.
The throughline is simple. A diagnosis is a label, not a treatment plan. Underneath that label there is measurable biology, and most workups never go looking for it.
He is also the most careful guest I have had on this subject. He hedges his own claims, he tells you when to stop taking something, and he says out loud that nothing helps every child.
What a mast cell actually is
Mast cells were discovered in 1887 and medical school teaches them as allergy cells. Dr. Theo says that covers about one percent of what they do. Each one holds roughly 1,000 sacs of preformed molecules and can release around 300 different ones.
The ones that matter here sit in the brain, in the meninges and near the amygdala, which is the part that regulates behavior, fear, and memory. When they fire, they open the blood brain barrier and disrupt connectivity between regions.
His line for it: "I cannot change the spark plugs of the brain, so I've got to remove the rust, which is inflammation."
His lab measured MMP-9, an enzyme mast cells release, at four times higher in donated autistic brain tissue than in controls. That is the part that makes this science rather than opinion.
Check the cereal box
Propionic acid is made by bad gut bacteria. Inject it into an animal brain and you get autism-like effects. It is also one of the most common preservatives in the food our kids eat, including cereal.
That was the moment in the recording where I stopped and wrote something down.
The four things he wants checked
Brain inflammation, folate, vitamin D3, and oxidative stress. He says vitamin D runs low in roughly 30 percent of children no matter how much sun they get.
None of those four are standard in a typical autism workup, which is the whole point.
The folate test most kids never get
A multivitamin is not always enough. MTHFR variants limit how well the body converts folate, and folate receptor antibodies can block folate from getting into the cell at all. The test for that is called the FRAT, the Folate Receptor Autoantibody Test, and it has to be ordered by a physician.
Here is the part that surprised me. If folate or B12 looks high in the blood, that is not automatically good news. It can mean the folate is piling up outside the cells instead of getting in. He asks for RBC folate and RBC B12 so you can see what is actually making it inside.
The 30-second test at your kitchen table
Drag a fingernail firmly down your child's forearm in a straight line. Wait two minutes. If a raised red welt comes up along that line, that is dermatographia, and it means mast cells fired from pressure alone.
It is not a diagnosis. It is a flag worth bringing to an appointment.
The thing nobody checks first
"I've never seen behavior changes so much as when a kid is constipated."
Before you add anything, he says ask for a flat abdominal X-ray. A kid who is backed up cannot always tell you that, and the behavior is the only signal you get.
When the doctor says no
A mother asked her pediatrician for the folate receptor antibody test. He refused to order it.
Dr. Theo's reaction: "He just refused to order the test. And I don't get it because there's no skin off his back."
If you have sat in that chair, you already know the feeling. All the doctor had to do was sign.
How not to get ripped off
Run from anything that says it boosts the immune system. As he puts it, if you have inflammation you do not want to boost the immune system, you want to regulate it.
Check the source, check the purity, and check whether an independent lab tested it. Pharmaceutical grade luteolin runs about 500 dollars a kilo, so when you see 100 milligrams for ten dollars, the math does not work. "There's no way on Earth that 100 milligrams can cost 10 bucks."
The fad graveyard
Twenty years of hyperbaric oxygen, hemp oil, imported worms, and mucus plug flushes that people were told were parasites. "It wasn't tapeworm. It was actually the mucosa of the gut that was sloughing off."
On stem cells sold abroad, he is blunt. They do not cross the blood brain barrier, and the damage is to the connectivity between regions, not to the neurons themselves. "If you give stem cells, you're replacing cells, but you're not replacing the connectivity."
The most honest thing he said
"I hate the term therapeutic because I don't know what I'm treating."
That is a man who helped develop a supplement line saying he will not call it a treatment. He also gave the cleanest stopping rule I have heard. You should see improvement by three months, and if six months brings nothing, stop.
The line I keep thinking about
"The brain is working. The fact that they don't speak doesn't mean anything."
If your kid is non-speaking, read that one again.
Questions parents ask
What is the FRAT test?
The Folate Receptor Autoantibody Test. It checks for antibodies that block folate from getting into the cell, which is a different problem from how much folate is in the blood. It has to be ordered by a physician.
What is dermatographia?
A raised red welt that comes up where the skin was scratched or pressed. It means mast cells released their contents from pressure alone. It is easy enough to check for at home, and it is a flag rather than a diagnosis.
Why would normal bloodwork still be wrong?
Because blood levels tell you what is circulating, not what is getting inside the cells. High folate or B12 in the blood can mean it is accumulating outside the cells. RBC folate and RBC B12 answer the question the standard panel does not.
What does propionic acid have to do with autism?
It is produced by certain gut bacteria and it causes autism-like effects when introduced into animal brains. It is also a widely used food preservative, which is why Dr. Theo tells parents to read the label on the cereal.
How long should you try something before stopping?
Three months to see improvement, six months at the outside. If six months brings nothing, he says stop.
About Algonot
This episode was not sponsored and the conversation was not paid for. Dr. Theo co-founded Algonot and helped develop the products he mentions, and he says so himself, unprompted, on the record. That is the connection worth knowing when he talks about NeuroProtek, Vital Folinic with MTHF, PureLut, or Viral Protect. Code ROB5.
Resources mentioned
FRAT, the Folate Receptor Autoantibody Test. Must be ordered by a physician.
MTHFR gene analysis.
RBC folate and RBC B12, to see what is getting inside the cells.
Flat abdominal X-ray, when behavior spikes and nobody can explain it.
Astelin (azelastine) and NasalCrom (cromolyn), over the counter nasal sprays.
Dr. Theo's website and intake form: drtheoharides.com
Dr. Theo on Instagram: @drtheoharides
More Seen and Heard episodes: listen.theautismdad.com
Preorder Rob's book: theautismdad.com/book
Dr. Theo sees patients in Fort Lauderdale the third week of each month, adolescents and adults only, not young children.
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