Corn[edit]
Corn used for food has been genetically modified to tolerate various herbicides and to express a protein from Bacillus thuringiensis (Bt) that kills certain insects.[35] About 90% of the corn grown in the U.S. was genetically modified in 2010.[36] In the U.S. in 2015, 81% of corn acreage contained the Bt genetic modification, and 89% of corn acreage contained the glyphosate-tolerant genetic modification.[18] Corn can be processed into grits, meal and flour as an ingredient in pancakes, muffins, doughnuts, breadings and batters, as well as baby foods, meat products, cereals, and some fermented products. Masa flour is variety of flour that is produced using the alkaline-cooked process. A related product, masa dough, can be made using corn flour and water. Masa flour and masa dough are used in the production of taco shells, corn chips, and tortillas.[37]