In a press release issued on May 19, the American Academy of Environmental Medicine released a position paper calling for a moratorium on genetically modified foods. These foods--primarily corn, soy, canola and cotton, most of which are used in production of oils and animal feed--are linked, they claim, to mutagenic and other undesirable effects in not only the plants themselves but in those consuming them. Citing a lack of long term study of the modified plants (often referred to as GMO, or genetically modified organisms), the doctors of this organization want the food and agricultural industries to further study the impact of genetic engineering on the internal organs, reproduction, and disease resistance of animals fed such foods.