GoKawiilOpposition to vaccines grew more visible during the COVID-19 pandemic.Credit: Mike Kemp/In Pictures via Getty
More than two-thirds of the public believe at least one false or unproven health claim — such as the idea that taking paracetamol during pregnancy causes autism — a new survey finds. The results hint that a large, and potentially growing, number of people are questioning scientific evidence.
The survey, of more than 16,000 people across 16 countries, asked whether they believed claims that are not supported by research, including that the ‘risk of childhood vaccinations outweighs benefits’, ‘fluoride in water is harmful’ and ‘raw milk is healthier than pasteurized’.
For each statement, between 25% and 32% of respondents said they believed it, and another sizeable percentage (17–39%) said they didn’t know whether it was true. In total, 70% of respondents believed at least one of the claims (see ‘Divided views’). The findings, which have not been peer reviewed and were published today by the Edelman Trust Institute in New York City, were described as ‘staggering’ in an accompanying article by the think tank’s chief executive, Richard Edelman.
Source: 2026 Edelman Trust Barometer report
The result “blows the lid off of this idea” that such beliefs are held by only a fringe population of individuals who are uninformed or ideologically driven, says David Bersoff, head of research at the Edelman Trust Institute. “This is not like a small problematic group.”
“There has definitely been a growing number of people who question widely accepted scientific evidence,” agrees Heidi Larson, who studies confidence in vaccines at the London School of Hygiene & Tropical Medicine. “It’s important to pay attention to.”
Controversial claims
Other recent studies have highlighted how commonly people question scientific consensus or evidence-based medical practices, at least in certain contentious areas, such as vaccines. One global 2023 study found that during the COVID-19 pandemic, people’s confidence that vaccines are important for children fell in 52 of 55 countries.
This year, a survey from KFF, a non-profit health-policy research organization in San Francisco, California, found that 34% of adults in the United States thought it was definitely or probably true that taking Tylenol (paracetamol) during pregnancy increases the risk of the child developing autism, even though scientific evidence does not support the link1.
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