Tumors Linked to Genetically-Modified Corn

In a study published in Food Chemical Toxicology, scientists at the University of Caen, Institute of Biology, in France found severe effects of Round-up tolerant genetically modified (GM) corn, even when the pesticide Round-Up was not used.

The study was done on rats to determine whether there are any health effects of eating genetically-modified corn. The rats were studied for two years. In both males and females, the death rate was two to three times higher in those eating the genetically-modified corn, compared to the controls.

Females developed large mammary tumors more often than controls and experienced pituitary gland abnormalities. The pituitary gland is found in the brain and aids hormonal balancing. The scientists also found that hormone balance was negatively affected by eating genetically-modified corn without Roundup and with Roundup alike.

Males experienced liver damage and premature death of liver cells that were 2.5 to 5.5 times higher than controls. Males eating the genetically-modified corn also suffered from severe kidney damage. There were four times more tumors in rats that ate either genetically-modified corn or Roundup-sprayed GM corn.

Scientists link the hormonal effects and tumors to the known endocrine-disrupting effects of Roundup but also to metabolic effects related to the overexpression of the genes used in the genetic-engineered corn.

While I’m never a fan of animal tests, I thought it was important to share this study with you, particularly because GM corn (among other food) was unleashed on an unsuspecting public and is now in widespread use in our food supply.  GM corn is found in most prepared and packaged foods in various forms including as corn starch, corn, and corn syrup (high-fructose corn syrup).

Considering the commercial stakes and the threat to GM-food giant Monsanto’s seeming attempts at food totalitarianism, it is no surprise to me that the scientists came under attack for their study.

For me, the important message that comes out of the study is the importance of eating organic and avoiding genetically-modified foods at any cost. We simply don’t know enough about the long-term effects of eating food that has been artificially tampered with using the genes from other species. GM foods should never have been “grandfathered-through” as “generally-recognized as safe” (GRAS) by the FDA, Health Canada, and other organizations, when there was insufficient research on their safety.

For more information about genetically-modified foods, read the excellent books by Jeffrey M. Smith Seeds of Deception and Genetic Roulette.  I’ll discuss more of the problems linked with GMOs in upcoming blogs.

Note: This study was conducted on a small number of subjects. Further investigation and long-term, independent studies are needed to determine the effects of genetic modification.

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Tanja W.
Tanja W3 years ago

thank you!!!

Karen H.
Karen H4 years ago

FDA’s deputy commissioner of policy, Michael Taylor, declared on behalf of the FDA that GMOs are safe and require no further testing. But did you know Taylor was previously Monsanto’s attorney? After he left the FDA, he returned to Monsanto as vice president. What's wrong with this picture?

Morgan Hartman
Morgan H4 years ago


Becca McCoy
Cuppy M4 years ago

Corn was originally a grass so people that complain about GMF shouldn't be eating corn to begin with...

Debbie Crowe
Debbie Crowe4 years ago

Reading this is bad timing - I have a craving for Corn on the Cob. How do I find Organic???

Lynn C.
Lynn C4 years ago


Mit Wes
Mit Wes4 years ago

This is just a rehash of the discredited Seralini study that allegedly found increased cancer rates when RR Corn, RR Corn Roundup and Simply just Roudnup with non-gmo corn was fed to differnet groups of rats. All three groups had about the same frequency of the same cancers, regardless of concentrations. All three groups had about the same frequency of cancers that one would expect from the strain of rats used. The only curious thing was the control group. It had cancer rates much lower than would be expected from that strain of rats. In any case the study has been dismissed by many groups, including the EU and six acadamies of science in France, Seralini's homeland.



Deb L.
Deborah L4 years ago

I stopped buying fresh & canned corn a couple years ago because of this. I now will only buy packaged Non-GMO Organic corn at Trader Joe's & hope it's truly clean!

Latoya Brookins
Latoya Brookins4 years ago

I can't believe someone on here actually tried to justify torturing and murdering innocent animals. They should not be forced to suffer because of human wrongdoing.