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Although scientists have been able to demonstrate that GMOs are not toxic to the animals that eat them, as described above and elsewhere, what about side effects being passed on to our next generations?To discern whether GMO crops affect fertility or embryos during gestation, a group from South Dakota State University again turned to studies on rats.
To address these concerns, there have been over 100 research studies comparing the effects of traditional food to genetically modified food, the results of which have been reviewed in various journals , .
How these results affect regulation can be found through The Center for Environmental Risk Assessment, which hosts a GM Crop Database that can be searched by the public to find GMO crop history, style of modification, and regulation across the world .
To address buildup of toxicity over time, this group monitored the GMO-eating rats not only for the lifetime of one generation, but also three additional generations.
For each generation, they tracked the fertility of parents and compared the health of the embryos from parents that ate corn to those with parents that did not .
Three years earlier, a separate group had found the same results for a GMO tomato and a GMO sweet pepper .
These researchers had split rats into four diet groups: non-GMO tomato, GMO tomato, non-GMO sweet pepper, and GMO sweet pepper.
Despite massive ingestion of GMO potato, tomato, or sweet pepper, these studies demonstrated no differences in the vitality or health of the animals, even at the microscopic level.
Experiments like these on humans would be completely unethical.
To examine the affect of corn on testicular health, the researchers tracked testicular development in fetal, postnatal, pubertal, and adult rats for all four generations.
The group found no change in testicular health or litter sizes in any generation.