How do Schneider and Schneider define genetically modified foods?

They explain what a genetically modified food is this way: "A genetically modified (GM) food or genetically modified organism (GMO) results from the use of recombinant DNA biotechnological procedures that allow the genetic makeup of a food or organism to be altered in some way. This 'recombination' can be accomplished by moving genes from one organism to another or by changing genes in an organism that are already present. These changes result in the expression of attributes not found in the original organism."