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Nearly half of Americans subscribe to a medical conspiracy theory, survey finds

By Los Angeles Times

POSTED:
LAST UPDATED: 06:51 p.m. HST, Mar 19, 2014


Is there really a link between vaccine and autism, cellphones and cancer, HIV and the CIA? Almost half of Americans believe the answer is yes for at least one of the many medical conspiracy theories that have circulated in recent years. And the attitudes and behavior of those conspiracists toward standard medical advice reflect that mistrust, says a study out this week.

A pair of University of Chicago social scientists set out to determine the extent of "medical conspiracism" among the U.S. public and conducted a nationally representative online survey of 1,351 adults. They gauged knowledge of and beliefs about six widely discussed medical conspiracy theories and explored how belief in those theories influenced individuals' behavior when it came to matters of health.

Their results appeared as a letter published online this week in the journal JAMA Internal Medicine.

Fully 37 percent of those surveyed endorsed the belief that the Food and Drug Administration, under pressure from pharmaceutical companies, is suppressing natural cures for cancer and other diseases, and 31 percent said they "neither agree nor disagree" with that idea, the researchers found.

One in five of those surveyed said they agreed that physicians and the government "still want to vaccinate children even though they know these vaccines cause autism and other psychological disorders." And 36 percent were on the fence, saying they neither agreed nor disagreed that there may be truth in the much-studied and widely discredited contention that vaccines cause autism.

Similarly, 20 percent said they believed that cellphones had been found to cause cancer but that the government had bowed to large corporations and would do nothing to address the health hazard. Though 40 percent disagreed, the remaining 40 percent withheld judgment on the idea that the government has been silenced about a known link between cellphones and cancer.

Less-widely recognized medical conspiracy theories concerned genetically modified foods, HIV and water fluoridation, and they were not without adherents.

Just 12 percent of respondents said they agreed with a widely discussed theory that genetically modified foods have been widely disseminated by Monsanto Inc. as part of a secret program called Agenda 21, launched by the Ford Foundation and the Rockefeller Foundation to shrink the world's population. While 42 percent disagreed, 46 percent stayed on the fence.

Just over half of Americans rejected outright a widely circulated theory alleging that the CIA deliberately infected African-Americans with the HIV virus under the guise of a hepatitis inoculation program. But 12 percent agreed, and 37 percent said they neither agreed nor disagreed.

The authors of the letter, J. Eric Oliver and Thomas Weed, said the conspiracy believers spanned the political spectrum and tended to espouse conspiracy theories outside of medicine as well. But they found that the more conspiracy theories a person endorsed, the more likely he or she was to take vitamins and herbal supplements and buy mostly organic food, and the less likely he or she was to get an annual physical, wear sunscreen, visit a dentist or get a flu shot.

Given that medical conspiracy theories are so widely known and embraced, said Oliver and Weed, it would be unwise to dismiss all those who believe them as a "delusional fringe of paranoid cranks." Instead, they suggested, "we can recognize that most individuals who endorse these narratives are otherwise normal" but use a sort of cognitive shortcut to explain complex and confusing events. Physicians can also glean a bit more about their patients -- and their readiness to accept medical counsel -- when they know that a conspiracy adherent has come for the occasional doctor visit.






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