It’s true that the rate of autism diagnoses in the U.S. have been rising.

Health Secretary Robert F. Kennedy Jr. argues that’s due to increased exposure to some still unfound environmental exposure.

But experts say that it’s most likely due to the expansion of autism diagnostic criteria since the 1980s, encompassing a much broader range of behaviors and developmental differences — a case born out by the fact that rates of ‘profound autism’ have mostly stayed the same in that time.

This week, the Trump administration announced that it was taking “bold action” to address the “epidemic” of autism spectrum disorder — starting with a new safety label on Tylenol and other acetaminophen products that suggests a link to autism. The scientific evidence for doing so is weak, researchers said.

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