Genetic engineering is the process of changing the genetic material of a living organism to produce some desired change in that organism’s characteristics. This process is often used to develop new plant and animal varieties that are later used as sources of foods, referred to as GE foods. For example, genetic engineering is often used to improve a plant’s resistance to pests or to allow a plant to withstand the use of pesticides. Some of the most common GE crops include varieties of corn and soybeans. In 2011, 88 percent of all corn and 94 percent of all soybeans produced in the U.S. were grown from GE seeds. Other common GE crops include alfalfa, canola, cotton, papaya, sugar beets, and zucchini. In addition, GE crops are used to make food ingredients (such as high fructose corn syrup) that are often included in processed foods (meaning foods that are not raw agriculture crops). According to some estimates, 40 percent to 70 percent of food products sold in grocery stores in California contain some GE ingredients.
source: CA Secretary of State