RFK Jr. has vowed to find the root cause of the ‘autism epidemic’ in months. Scientists have doubts.

Is the government studying autism?
Health Secretary Robert F. Kennedy Jr. last month launched a “massive testing and re­search effort” that he says by September will reveal the mystery of what causes autism— and what is behind a surge in diagnosed cases. Kennedy, who has for years promoted the discredited claim that vaccines cause autism, didn’t mention childhood shots when announcing the study. But he proclaimed his certainty that an “environ­ mental toxin” is behind rising case numbers, and said scientists will look at food additives, mold, pesticides, medicines, ultrasound scanning, and other poten­tial factors. “This is a preventable disease,” Kennedy said. “We know that it’s an environmental exposure.” Experts say his claims are deeply flawed. The overwhelming majority don’t believe that autism—a neurological and developmental disorder with a range of symptoms that typically include impaired communication and social skills—is caused by environmental factors. And while autism rates are trending higher, “it seems very unlikely that it is an epi­demic, in the way that people define epidemics,” said Catherine Lord, an autism researcher at University of California, Los Angeles.

Have rates climbed significantly? 
Autism incidence in the U.S. has gone from 1 in 150 children in 2000, to 1 in 54 in 2016, to 1 in 31 in 2022, according to the CDC. But experts believe much or all of this rise is due to im­proved diagnosis and a broadening of the criteria for who quali­fies as autistic. There’s no blood test or brain scan that can detect autism spectrum disorder; diagnoses come through observation, with universal screenings recommended since the 1990s for 18 and 24 months. Experts say clinicians and parents have become better attuned to symptoms and that cases that once would have been labeled as mental retardation and language disorders now fall under ASD. “You’re cap­turing more subtle presentations,” said Roma Vasa, a psychiatrist at Johns Hopkins Uni­versity School of Medicine. There is evidence to back this up. Severe cases involving non­ verbal children, which are easily diagnosed, have held steady. And there’s been a dispro­portionate rise in cases among Black and Latino children, which could correlate with improved access to diagnostic services. But exactly what causes autism is not yet clear.

What do we know? 
Scientists say the primary cause of autism is genetic, with environmental factors play­ing a secondary role. Powerful evidence of this can be seen in studies of twins. In iden­tical twins, who share all their DNA, if one twin has ASD, the other typically does as well. And in fraternal twins, who share about half their DNA, if one twin has au­tism, the chance the other will also ranges from 53 percent to 67 percent, according to a review of studies. Researchers have iden­tified more than 250 genes associated with elevated odds of ASD, and linked most autism cases—about 80 percent—to inher­ited genetic mutations and at least another 10 percent to noninherited mutations. While autism generally surfaces during toddler­ hood, experts believe it is “established in the earliest stages of brain development, in the womb,” said Mady Hornig, an epidemiol­ogist at Columbia University. It’s possible that environmental factors may play a con­tributary role in utero.

What types of factors? 
Numerous studies have linked maternal exposure to air pollution, especially late in pregnancy, with higher risk of an autistic child. It’s suspected that ultrasmall particles of fossil fuel pollution may trigger biological cascades that effect brain development, and that individuals with a genetic predisposition to autism are more vulnerable to these harm­ful effects. Researchers have examined other toxins. A UCLA study found that pregnant mothers who live near farms that spray com­monly used pesticides were up to 16 percent more likely to have children diagnosed with autism than those who live farther away. Vitamin deficiencies could also play a role: Several studies have noted a lowered autism risk among pregnant mothers who took folic acid, or vitamin B9; in a 2013 Norwegian study, the drop was almost 40 percent. Scientists have also drawn connections between autism and certain physiological risk factors in parents.

How strong are those links? 
There seems to be a powerful correlation between autism and pa­rental age, especially among children born to older fathers. An Israeli study found that children fathered by men in their 40s or older were six times more likely to have autism or related disorders than those fathered by men younger than 30. Preterm births may also be a pre­dictor for autism: A study of 4 million births in Sweden found that a child born between 28 and 33 weeks is about twice as likely to be diagnosed with autism than one born at full term, and that those born between 22 and 27 weeks are four times as likely to be diagnosed. Meanwhile, a study of Swiss moth­ers showed that those who’d been hospi­talized for an infection during pregnancy were 37 percent more likely to have a child with autism. All these findings indi­cate “autism is an extraordinarily complex condition,” said Hornig, “probably influ­enced by hundreds of genetic, environ­mental, behavioral, and dietary factors.”

Might RFK Jr.’s study shed any light? 
Odds are low at best, say scientists. Properly conducted, such an effort would re­quire years, not months. And the study’s premise, that a sole environmental cause can be found and eliminated, refutes everything known to date about autism. We’re dealing with “the complexity of the formation of the human brain,” said Janine LaSalle, a professor of microbiol­ogy and immunity at University of Califor­nia, Davis. “If there were a single smoking gun, it would have been found by now.”

An enduring myth 
More than a dozen major studies involving hundreds of thousands of children across three continents have proved comprehen­sively that vaccines do not cause autism. But the idea of a link between childhood shots and autism—in particular the measles, mumps, and rubella vaccine—has shown dogged staying power. A recent Gallup survey found 13 percent of Americans believe in the connec­tion and half were unsure. The fears over MMR date to 1998, when British doctor Andrew Wakefield published an article in The Lancet tying vaccines to autism in a dozen children he studied. Scores of problems were found with the study, which was retracted by the journal. But “the cage door got open, and the devil came out,” said vaccine expert Paul Offit. Scientists note several reasons the debunked theory has such legs, including that the first MMR dose is given between 12 and 15 months—around the time autism typically emerges. And blaming vaccines for causing autism gives parents a simple explanation for a condition that continues to puzzle scientists. Whatever the cause is, said UCLA autism researcher Lord, “it’s not vaccines.”

“Democrats might be tempted to take solace” from President Trump’s tumbling poll numbers, said Noah Rothman in National Review. “They shouldn’t.” While Trump’s net approval rating has sunk more than 5 percentage points since he took office in January, to about 45 percent, Democrats are doing even worse, with only 33 percent of voters viewing the party favorably. Since Democrats held a healthy 6-point lead over Republicans at this point in Trump’s first term, that’s bad news for the party’s 2026 midterm prospects and proof that “the well of mistrust Democrats cultivated in the Biden years goes deep.” To win back voters, top lawmakers have offered only “impotent theatrics.” Sen. Cory Booker and House Minority Leader Hakeem Jeffries staged a pointless 12-hour sit-in on the U.S. Capitol steps to protest the Trump agenda, while Senate Minority Leader Chuck Schumer went on TV to tout a “very strong letter” he wrote to the president. They clearly have no idea how to “repair their party’s image.”

JB Pritzker does, said Renee Graham in The Boston Globe. In a speech to New Hampshire Democrats last week, the Illinois governor blasted the “simpering timidity” of party leaders in the face of Trump’s authoritarian threat and called “for mass protests, for mobilization, for disruption.” And he slammed “do-nothing Democrats” who want to blame the party’s 2024 losses “on our defense of Black people and trans kids and immigrants—instead of their own lack of guts and gumption.” It’s an electrifying wake up from the “Schumer stupor” and sure to be welcomed by Democratic voters and left-leaning independents, 74 percent of whom think elected officials aren’t pushing back against Trump hard enough. Democrats should give Pritzker “a serious look as a presidential candidate,” said Perry Bacon Jr. in The Washington Post. A billionaire from a deep-blue state, he may not be the ideal nominee for 2028. But “he’s great for the party now.” 

A message of “all resistance, all the time” will not fix the “working-class-size hole” in the Democratic coalition, said Ruy Teixeira in The Liberal Patriot. Freshman Arizona Sen. Ruben Gallego has an approach that could do the job: The Marine veteran criticized the Biden administration for lax border enforcement, has railed against Trump’s government cuts, and is “unafraid to highlight the non-woke priorities of Latino working-class men who all want, as he put it, a ‘big-ass truck.’” Progressive primary voters may not tolerate such “apostasy,” and the mission of detoxifying the Democratic brand “may not matter” if Trump’s approval rating keeps nose-diving. But outrage alone is not a winning strategy.

Bella Ramsey was not a typical teenager, said Tim Lewis in The Observer (U.K.). The British actor struggled to make friends with other children growing up but fit right in with the adult cast of Game of Thrones, which they joined at age 11 in 2013. “Immediately it felt like a place where I belonged, which I’d never felt anywhere else in my life,” says the actor. “I feel like I went from kid to adult. I had to show up on set every day and be responsible and have this very adult job.”

Now 21 and the star of HBO’s The Last of Us, Ramsey has moved into a London apartment and has “a small group of friends who are my age—for the first time.” Being diagnosed as neurodiverse helped Ramsey’s confidence, a process that began in 2023 when someone on The Last of Us set “just assumed that I was autistic. They had a kid who was and were like, ‘You are, right?’ And I was like, ‘Whoa!’ It turns out I am, which has been so helpful for me. Like, every day.” That same year, Ramsey also publicly came out as nonbinary. “It’s been a mixed bag,” the actor says, because they weren’t prepared for the subsequent flood of media attention. “But overall, it was a good thing, just for me living more freely, without feeling like I’m keeping a secret.”