GMO's are (genetically modified organisms) it's an organism that has had its DNA modified in someway. GMO's have made it so plants can grow bigger and faster, also some are changed so that they can have round-up sprayed on them and they won't die. Some plants have a bunch of different things done to their dna and sometimes the things they have done to the dna is good for you when you eat it. For an example, there was some engineers who modified a tomato to produce higher levels of nutrients called anthocyanins, which have been shown to be protective against a wide variety of human diseases. But it also isn't always good to you it's only some of them that are, because they aren't always the same. Like some gmo's have bad things added to their dna and it isn't good for your body.