Since 2018, a multi-year trial series has been running here to cultivate the sweet potato, which has so far grown mainly in Asia, America and Africa. It turns out that many common foods have already been genetically modified, by a bacterium called Agrobacterium. I'll start with the common sweet potato, or yam. But then we came along, and (apparently) we liked the taste of these naturally transgenic sweet potatoes, so those are the ones that we chose to cultivate. As a result, all the sweet potatoes we eat are GMOs, although it happened naturally.

Source: Forbes January 20, 2020 12:22 UTC