www.huffingtonpost.com - January 22nd, 2013
Sixty two countries have either banned or required mandatory labels for GMO foods (as of late 2012). This includes not only all of Europe, but also China, India, Brazil, Russia, and Syria. In Europe, GMO food represents a very small proportion of the food supply, but it's not banned.
In the USA, GMO food quietly entered the food supply in the 1990s and has been sold to unsuspecting consumers ever since, without any labeling. In that time, America has seen sharp rises in allergies, bowel-related diseases, and autism compared to countries that don't eat GMOs.There are many different GMO foods, and we have almost no scientific knowledge as to which ones are safe.
There have been very few controlled studies on the health impact of GMOs; no controlled human trials; and only one long-term animal study. Scientists are impeded from conducting tests. Researchers are legally barred from access to the GMOs, and the derivative foods are unlabeled, making controlled experiments nearly impossible.
The only long-term study found that GMO corn caused massive tumors and premature death in rats starting after one hundred days. Critics complained about the sample size and types of rats used in this study; but those were the exact same as the FDA-approval study, which cleared the GMO corn as "safe" after monitoring impact on rats for only ninety days. I believe the science so far is inconclusive, and I'd love to see more studies.