The internet is buzzing again. Donald Trump made headlines suggesting Tylenol might be linked to autism. Before that, it was vaccines at the center of the storm.
And here's what's interesting: it almost doesn't matter which side of this argument you're on. If you think the idea is ridiculous, you're outraged it's being discussed. If you think there might be something to it, you're outraged it keeps getting dismissed. Either way, there's a lot of anger and very little thinking.
That anger might be the real problem. Because it's stopping us from asking a better question.
The Correlation Trap
One of the most frustrating challenges in human health is the problem of correlation.
Yes, there are studies showing an association between acetaminophen use in pregnancy and autism. Yes, children's vaccination schedules overlap with the timing of autism diagnoses. But none of these studies demonstrate causation. The data is messy, contradictory, and confounded by hundreds of variables: genetics, infections, socioeconomic factors, even differences in how often children get screened.
Remember when COVID-19 started spreading and maps appeared correlating 5G cellular networks with infection rates? People genuinely believed one caused the other. To make a point, I produced a map showing the layout of fast-food restaurants, dry cleaners, and banks. Guess what? They correlated with both 5G rollout and COVID-19 infections.
Why? Because all of those things require human population. Every one of those maps simply reflected where people were. That's it.
So maybe we're asking the wrong questions entirely. Instead of treating Tylenol or vaccines as villains or saviors, maybe we should look for what else they have in common. What larger pattern are we missing?
This is the kind of thinking that evolutionary mismatch forces you into. Stop looking for a single villain. Start looking for the system.
Fever: The Defense We Keep Shutting Down
When a child gets sick, or when they receive a vaccine, the body often responds with a fever. This is not a malfunction. Fever is an evolved, built-in defense mechanism that slows pathogens and rallies the immune system. Heating the body makes the environment hostile to invaders and, at minimum, slows their replication.
For most of human history, fever ran its course. Then modern medicine gave us drugs that could bring it down. About twenty years ago, medical guidelines shifted from "fight the fever" to "fight the discomfort, not the fever." In practice, though, the result was often the same: we suppressed the fever and, with it, an important immune function.
Think about this carefully. People develop a fever when a pathogen enters the body, whether that invasion is natural or introduced by a vaccine. If we let the body do its job, the fever slows the pathogen's progression and limits the damage. If we suppress it, we may be giving pathogens and inflammatory processes more room to operate at exactly the moment when a developing brain is most vulnerable.
That deserves a closer look.
The Global Pattern
Zoom out and you start to see something in the cultural data.
Some countries, like the United States and Canada, have what we might call a 2025-style medical culture: quick to medicate, quick to suppress discomfort, quick to reach for pharmaceutical solutions. Other countries sit earlier on that timeline. They're more conservative in prescribing, less reflexive about suppressing fever.
When you compare those medical cultures to autism prevalence, another pattern emerges: countries further along in suppressing fevers also tend to be further along in reporting and diagnosing autism.
This is not proof. But it is a correlation worth noticing. And it points somewhere different than the usual debate.
The Glutathione Problem
There's another layer to this story, and it's one that rarely gets discussed in the public conversation.
The brain depends heavily on glutathione, the body's master antioxidant. Infections deplete glutathione. Vaccines, by triggering an immune response, may deplete it too. And acetaminophen, the most common fever-reducing drug on the planet, uses up glutathione as part of its metabolism.
Now imagine the sequence: a child or a pregnant mother gets an infection, their glutathione levels drop, and then acetaminophen is given, depleting glutathione further. At the very moment when the developing brain most needs antioxidant protection, the reserves may be at their lowest.
We also know that pathogens themselves can cause neurological harm. Maternal infections during pregnancy have been linked to higher autism risk. Animal studies show that maternal immune activation can alter brain development. Viral and bacterial infections, from influenza to meningitis, have been shown to leave lasting neurological marks.
So if fever suppression and glutathione depletion allow pathogens to persist longer or multiply more freely, even subtle brain injuries become more likely.
Put these three factors together:
- Suppressing fever during infection or vaccination
- Depleting glutathione at a vulnerable moment
- Pathogens capable of neurological harm
And you have a combination that could be creating conditions where subtle, cumulative injuries contribute to developmental outcomes. That's a hypothesis worth testing. It's certainly more useful than screaming about Tylenol on one side or dismissing every concern on the other.
Trust the System
I'm not claiming to have the answer. I am saying we may be asking the wrong questions.
Evolutionary mismatch may be at the heart of this. The real issue might not be Tylenol or vaccines themselves. It might be our reflexive need to suppress fever. Of course we want to end discomfort. That impulse is human and understandable. But in acting on it, we may be weakening the very defenses that nature spent millions of years building.
This is the same pattern I write about in The Gap book and in my work on health and wellness. Modern life creates a gap between how our bodies were designed to function and how we actually live. That gap shows up everywhere: in what we eat, in how we move, in how we sleep, and, quite possibly, in how we handle fever.
For decades, hospitals taught "fight the fever." Then came "fight the discomfort, not the fever." Maybe the next step is to trust the fever. Support comfort without disabling the mechanism designed to keep us safe.
The true correlations may not lie in the easy scapegoats. They may lie in how we interfere with the body's own immune intelligence.
If we could get past the politics, past the outrage, past the noise, we might start exploring questions that lead us somewhere useful. My hope is simple: that this piece opens a door. The next step is not to slam it shut with certainty but to walk through it with curiosity.
I wrote WildFit because this same pattern of mismatch shows up in our relationship with food. Different system, same underlying problem. A brilliant biological design built for a world that no longer exists, and industries that profit from our confusion about how it works.
Frequently Asked Questions
The hypothesis is that suppressing fever during infection or vaccination may allow pathogens to persist longer while simultaneously depleting glutathione, the brain's key antioxidant. This combination, rather than any single drug or vaccine, could create conditions where subtle neurological injuries become more likely during critical developmental windows.
Countries quicker to medicate and suppress fever tend to report higher autism diagnoses. This correlation does not prove causation, as diagnostic practices and screening intensity also differ. But the pattern raises the question of whether aggressive fever management plays an underexamined role alongside improved detection.
Glutathione is the body's master antioxidant and is critical for protecting the developing brain. Infections deplete it, immune responses from vaccines may deplete it, and acetaminophen uses it up during metabolism. When all three coincide, antioxidant reserves may be at their lowest exactly when the brain needs protection most.
