Genetically modified foods (GMO foods) have been shown to cause harm to humans, animals, and the environment, and despite growing opposition, more and more foods continue to be genetically altered. It’s important to note that steering clear of these foods completely may be difficult, and you should merely try to find other sources than your big chain grocer. If produce is certified USDA-organic, it’s non-GMO (or supposed to be!) Also, seek out local farmers and booths at farmer’s markets where you can be ensured that the crops aren’t GMO. Even better, if you are so inclined: Start organic gardening and grow them yourself. Until then, here are the top 10 worst GMO foods for your “do not eat” GMO foods list (in no particular order).