Proponents of genetic engineering often make comments such as: "We’ve been eating genetically engineered food for years in the United States and there have been no problems, no-one has even caught a cold.” Considering that there have been no studies done (following people who’ve eaten genetically engineered food over years, comparing them with a control group of people who have not eaten GE food, taking blood samples etc) how on earth would we know if people are being affected? Many scientists feel that we would need to study the cumulative effects of eating genetically engineered food over years to know if we are being affected.
"Antibiotic resistance, the threat of new allergic reactions and the unknown hazards of transgenic DNA mean that on health grounds alone the impact of GMOs must be fully assessed before they are released. The environmental implications and the long term effects on human health cannot be safely predicted at this stage and caution must therefore prevail." - British Medical Association
"This technology is being promoted, in the face of concerns by respectable scientists and in the face of data to the contrary, by the very agencies which are supposed to be protecting human health and the environment. The bottom line in my view is that we are confronted with the most powerful technology the world has ever known, and it is being rapidly deployed with almost no thought whatsoever to its consequences." - Dr Suzanne Wuerthele, US Environmental Protection Agency (EPA) toxicologist