GMO is short for Genetically Modified Organism. Sometimes the term GE (Genetically Engineered) foods is used. When it comes to farm crops, it means that a gene from a non-plant species is forced into the genetic makeup (DNA) of a particular plant type. That never happens in nature.
Some GMO crops are designed to survive being sprayed with the herbicide Roundup. These are know as “Roundup Ready” crops. The latest figures from the USDA say that 93% of the soybeans and 85% of the corn grown in the US for all uses is GMO. They are the two main farm crops fed to feedlot animals. http://www.ers.usda.gov/data-products/adoption-of-genetically-engineered-crops-in-the-us/recent-trends-in-ge-adoption.aspx#.Ut6YTPtOnCN
While biotech companies were able to convince the US government that GMO food is safe and essentially the same an non-GMO food,they never had to prove it. And in recent years, studies have surfaced strongly suggesting that is NOT the case.
Animals fed GMO foods have been shown to develop serious ailments, and there is ever increasing evidence that we are developing the same ailments. In fact, epidemiological patterns show there’s an identical rise in over 30 human diseases correlated with our increased usage of glyphosate and the increased prevalence of genetically engineered proteins in our food.