The following is an excerpt from a Scientific American article debunking recent conspiracy theories surrounding the causes of autism in children. Read the full article here.
Robert F. Kennedy, Jr., head of the Department of Health and Human Services, struck an alarmist tone about new findings that one in 31 eight-year-olds in the U.S. have an autism diagnosis at a press conference today.
Kennedy called autism a “tragedy” that “destroys families.” And his statements also included assertations that autism experts say are out of date, such as the idea that autistic kids “regress” around their second birthday. In fact, while autism is often diagnosed at this age, researchers have found brain differences as early as six months of age among kids who were later diagnosed as autistic. Some studies have also found subtle differences in motor behavior and social behavior, such as looking less at people than typically developing kids do, in babies who were later diagnosed as autistic.
But Kennedy’s greatest breach with the scientific consensus was likely his insistence that autism is an “epidemic” that must be caused by an environmental exposure that has been introduced within the past several decades. In fact, researchers say, autism is between 60 and 90 percent heritable. And in up to 40% percent of cases, doctors can find a specific set of genetic mutations to explain the condition. While there are environmental risk factors for autism, such as air pollution, rising rates are mostly attributable to broadened diagnostic categories and more comprehensive screening.
“The problem from a science communication standpoint is that the causes are complex,” says Annette Estes, director of the University of Washington Autism Center. “It’s not like Down syndrome, where we can say, ‘There is one genetic change that leads to this syndrome, and everybody with this syndrome has these characteristics.’ Even though the amount we’ve learned is unbelievable, it’s also not a simple story.”
The new finding that one in 31 kids born in 2014 are autistic comes from a newly released report from the Autism and Developmental Disabilities Monitoring Network (ADDM), which started tracking data in 2000. That year one in 150 eight-year-olds were diagnosed as autistic, and the number has been steadily rising since. Kennedy also cited numbers from the 1970s and 1980s that showed rates of autism that represented around one to three in 10,000 people.
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