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Longest-Running GMO Safety Study Finds Tumors in Rats PDF Print E-mail
Written by Joan Russow
Sunday, 16 June 2013 10:46

Are GMOs dangerous? A new study shows that Monsanto’s genetically modified corn and Roundup herbicide cause negative health effects in rats, and is raising questions about the safety of GMOs.


By Tom Philpott  Mother Nature
April/May 2013

Read more: http://www.motherearthnews.com/natural-health/gmo-safety-zmgz13amzsto.aspx#ixzz2WPG10POQ

Monsanto’s Roundup-Ready corn caused a host of negative health effects in rats, including tumors and premature death.

Photo Courtesy AFP Photo/Criigen

Cornbread is an essential accompaniment to many good country meals. I think it's best when cooked a...

More than two decades ago, the U.S. Food and Drug Administration (FDA) granted GMOs “generally regarded as safe” status, meaning the industry had no obligation to conduct long-term safety studies. And while GMOs don’t have what scientists call “acute” effects, what about “chronic” effects — those that come on gradually and can’t easily be tied to one cause? The French study — the most comprehensive GMO safety assessment ever conducted — highlights that concern. It involved 200 rats and spanned two years, the life expectancy of the species of rat used. Previously, the longest study had lasted 240 days, says Michael Hansen, senior scientist at Consumers Union and an expert on GMO research. Industry-funded studies typically last just 90 days.

The researchers investigated how eating Monsanto’s Roundup-Ready corn (and any Roundup herbicide traces that may come with it) affected rats’ health. They separated rats into 10 groups: Three had part of their standard diet replaced at varying levels with Roundup-Ready corn that had been treated with Roundup in the field; three received the same feed protocol, but with untreated Roundup-Ready corn; three ate no GM corn but had tiny amounts of Roundup herbicide in their drinking water; and one control group ate two-thirds standard rat chow and one-third non-GM corn. Each group contained 10 females and 10 males.

The researchers say their results show “severe adverse health effects, including mammary tumors and kidney and liver damage, leading to premature death” from Roundup-Ready corn and Roundup herbicide, whether they were consumed separately or together. Almost all of the ill effects manifested after 90 days. By the end of the study, 50 to 80 percent of the females had developed large tumors, compared with 30 percent developing tumors in the control group. In males, liver congestion and necrosis were 2.5 to 5.5 times higher than in the control group, and there were 1.3 to 2.3 times more instances of kidney disease. Overall, among the rats receiving GM corn and/or Roundup, up to 50 percent of males and 70 percent of females died prematurely, compared with only 30 percent and 20 percent in the control group.

So does the study close the case? Are GMOs dangerous? Predictably, industry-aligned scientists are questioning the study, but even longtime critics of GMOs, including Hansen, have concerns. Hansen says that while the new study was longer and better designed than any of the industry GMO safety studies, the sample size — 10 males and 10 females per group — was too small to draw conclusions from.

Hansen says, however, that while the individual comparisons may not be statistically significant because of sample size, the results still paint a troubling picture. The study made 54 comparisons between treated rats and control rats, and in all but four, the treated rats showed worse outcomes. “That’s suggestive that there’s something going on and that there should be further research,” Hansen says, adding that a possible reason the researchers didn’t use a greater number of rats to get more robust results is because multiyear rat studies are extremely expensive.


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