More knowledge changes opinions on G.M. food

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People’s attitudes about genetically modified food would change if the public understood the underlying science better, according to new research.

Jonathon McPhetres, a PhD in psychology from the University of Rochester, admits he’s “personally amazed” what we can do with genes, specifically genetically modified food—such as saving papayas from extinction.

“We can makes crops better, more resilient, and more profitable and easier for farmers to grow, so that we can provide more crops around the world,” he says.


attitudes toward genetically modified foods chart
(Credit: U. Rochester)

One reason for the divide is that critics of genetically modified food have been vocal, often decrying it as “unnatural” or “Frankenfood”—in stark contrast to a 2016 review of published research that found no convincing evidence for negative health or environmental effects of GM foods.

“Political orientation and demographics inform attitudes and we can’t change those,” says McPhetres, the study’s lead author. “But we can teach people about the science behind GMOs, and that seems to be effective in allowing people to make more informed decisions about the products that they use or avoid.”

Understanding and acceptance

In a series of studies, the team discovered that people’s existing knowledge about GM food is the greatest determining factor of their attitudes towards the food—overriding all other tested factors. In fact, existing GM knowledge was more than 19 times higher as a determinant—compared to the influence of demographic factors such as a person’s education, socioeconomic status, race, age, and gender.



In one study, using a representative US sample, participants responded on a scale of 1 (don’t care if foods have been genetically modified), 2 (willing to eat, but prefer unmodified foods), to 3 (will not eat genetically modified foods). Next, the team asked 11 general science knowledge questions—such as whether the universe began with a huge explosion; antibiotics kill viruses as well as bacteria; electrons are smaller than atoms; and how long it takes for the Earth to orbit the sun.


The team found that specific knowledge about GM foods and procedures is independent from a person’s general science knowledge—making the first (GM knowledge) a nearly twice as strong predictor of GM attitudes.

How to overcome the skepticism?

The researchers followed up by conducting a five-week longitudinal study with 231 undergraduates in the US to test, first, if a lack of knowledge about GM foods could be overcome by teaching participants the basic science behind GM technology, and second, if greater knowledge would alter attitudes. McPhetres worked with Jennifer Brisson, an associate biology professor, who vetted the students’ learning materials.


Their findings, the team argues, lend direct support for the deficit model of science attitudes, which—in broad terms—holds that the public’s skepticism towards science and technology is largely due to a lack of understanding, or absence of pertinent information.

The team’s online modules avoid confrontational approaches “which threaten preexisting beliefs and convictions,” suggesting a relatively simply guide for how to overcome skepticism about GM foods: focus on the actual underlying science not the message.

For McPhetres, the studies tie neatly into his larger research focus on people’s basic science knowledge and general interest in science—and how to improve both.

Knowledge and appreciation of science—”that’s the kind of information that people need to make informed decisions about products they use, and the food they eat,” say McPhetres who’s now heading to Canada for a joint postdoctoral appointment between the University of Regina in Saskatchewan and the Massachusetts Institute of Technology.

The new findings appear in the Journal of Environmental Psychology. Additional researchers from the University of Amsterdam in the Netherlands and Cardiff University in Wales contributed to the work.

Source: University of Rochester