Humans have been eating GMOs for a few centuries now. For example, corn is an utterly artificial creation. The plant can not survive without human intervention. Also, there's many hybrids of other plants that people have been breeding for years that form the basis of many food crops.
If you want to get to GMOs where we directly manipulated the DNA, most people have been eating them for around 5 to 10 years.
If you'd like to prove GMOs are harmful, first you'll have to come up with some mechanism by which they could actually cause harm. Because then you'd have something to look for. That's been the big problem with the folks opposed to GMOs - they have lots of scary sounding stories, but they don't have a mechanism where the GMO can affect your body. Well, affect your body in a way other than being food.
ETA:
"They should have to study it first before releasing it!!"
They did. Before a GMO is planted in the wild, studies are done to see if the genes spread in unexpected ways. Or if the plant develops unexpected traits.
And then they ship it, and people demand more study.
GMOs sound spooky to people who don't understand what's being done. And unfortunately, our crappy education system means lots of people fall into that category. As a result, there's demands for "more studies". The problem is you can call for more studies forever. There will always be someone with a claim that a product is terrible. Heck, there's a large group of people who insist all food and drink are awful (the "Breatharians"
.
So, find a way where they can cause harm. Then it can be studied.
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