Genetically modified food is permitted without labeling in Mexico. Here is a listof some foods that you might find were made with GMOs, or maybe not. These products were not necessarily grown or made in Mexico. This article in La Jornada from February of this year addresses the existence of GMOs in processed food lines here. The illustrations are NOT endorsements. They are just a sad effort to liven up the appearance of the list.
MASECA: Maseca is a tortilla-making mix. Maseca with Vitamins may have genetically modified corn in it.
MISIÓN: Tortillas made ith 100% maize. Maseca and Misión both are part of Gruma, SA de C.V.
GRUPO MINSA: Masa de Nixtamal Instant, La Unica tortillas, tortillas from fresh masa La Única (brand) and tostada plana (toasted flat tortillas) La Única (brand)
BIMBO (Mexican company that owns Wonderbread) (Their products are "packed with goodness and made with love".) Milpa Real (brand) Toasted Corn Tortillas, white bread, multigrain bread, whole wheat bread, Pinguinos, chocolate rolls, Rocko, Triki-Trakes, and some more things available in Mexico, but I don't recognize what they are.
SMUCKERS: Jams and jellies (J.M. Smucker de México)
DEL FUERTE: Canned pickled chipotle peppers, corn, bottled catsup.
DEL MONTE: Canned jalapeño chiles in slices, whole jalapeño, sliced carrots, pickled chipotles, corn, marinated garbanzo beans, bottled catsup.
HERDEZ: Canned bean salad, jalapeño chiles, marinated green sliced jalapeños, nachos with pickled jalapeños, corn, vegetable salad, pickled mushrooms.
NESTLE (uses a LOT of our water, among other things): Baby food, dried milk drink for kids, Carnation, Cerelac, Cerelac Infantil, Mom , Bebé menu (dried milk drinks for mom and baby.) (When a product says drinks, it seems to mean that it's not pure milk. Has other stuff in it.) (When we were in the Peace Corps in Uganda about 45+ years ago [YIKES] Nestle worked hard to promote infant formula over breastfeeding.) sopón de frijol (I have no idea what this is), Carlos V chocolates, Kit-Kat candy bars, Tin Larin chocolate bars (Mexico), Nestea, Nestle's Gold, Corn Flakes, Zucosos and Chocapic cereals, dog Alpo and Friskies (Nestlé México).
CLEMENTE JACQUES: Jams and jellies (Anderson Clayton and Co.-Unilever)
CAPULLO: Edible vegetable oil (Anderson Clayton and Co.-Unilever)
RAGÚ: (Anderson Clayton and Co.-Unilever) (I don't know which products).
MAFER: Japanese peanuts, special peanuts, toasted peanuts, classic peanuts (Anderson Clayton and CO.-Unilever.
PRONTO: Toppings (Anderson Clayton and Co.-Unilever)
HOLANDA: Ice cream (Anderson Clayton and Co.-Unilever)
HELLMAN'S: (Dressings and mayonnaise (Cocina Corn Products (S.A: de C.V.)h
KNORR: Mole, adobo y Pipián (I think this means dried versions. (Cocina Productos de Maíz, S:A: de C.V.)
KARO: Baby food, high fructose corn syrup, maple syrup (Cocina Productos de Maíz, S.A. de C.V.)
BETTY CROCKER: Arroz con Leche (rice with milk), Brownies, toppings, (Cocina Productos de Maíz, S.A. de C.V.)
ADES: Soy drinks (Cocina Productos de Maíz, S.A. de C.V.)
MAIZENA: Atoles (corn-based drinks) (Cocina Productos de Maíz, S.A. de C.V.)
SABRITAS: Doritos and Ruffles and Fresqui Bon Bebidas (which seems to be some kind of drink mix)
KRAFT: Jell-O, Kool-Aid, Tang (Kraft Foods of Mexico, S.A. de C.V.)
GREAT VALUE: Catsup, Mayonnaise, BBQ sauce, Corn Flakes and sugared cereals (Servicios Administrativos Wal-Mart, S.A.de C.V.)
PRINGLES: Potato chips, pizza, cheeses (Procter and Gamble. Ex president Ernesto Zedillo has something to do with Pringles)
DANONE: Danette, Danup (Danone de México, S.A. de C.V.)
GAMESA; Cookies and crackers (Grupo Gamesa S.A. de C.V.)
MACMA: Cookies (Macma, S.A. de C.V.)
ESTEC: Pancake mix (South West International)
NABISCO: Three Stars cake flour, Royal baking powder, Oreos. (Nabisco, S.A. de C.V.)
DEL VALLE: Fruit juices Del Valle and Florida Juice 7, Shrimp, chicken (Nissin brand) and beef soup.
(Jugos del Valle, S.A. de C.V.)
PEPSI: Pepsi Cola (Pepsico de México, S.A. de C.V.)
SONRISA Fruit juices (Valle Redondo)
SANTA CLARA: Ice creams (Santa Clara Productos Lácteos, S.A de C.V.)
KELLOGG'S: Corn Flakes, Corn Pops, Corn Flakes crumbs, Froot Loops (Kelloggs de México, S.A. de C.V.)
MAIZORO: Corn Flakes and I think Sugared Corn Flakes (Maizoro, S.A. de C.V.)
PURINA: Various dog and cat foods. (Agibrands Purina México, S.A. de C.V.)
GRUPO MODELO: Various beers (Grupo Modelo, S.A. de C.V.)
CERVESERIA CUAHTEMOC: Various beers (Cervecería Cuahtémoc en México, S.A. de C.V.)
DELIMEX: Taquitos (Delimex Mexicana, S.A. de C.V.)
AURRERÁ, COMERCIAL MEXICANA (MEGA), NUTRISA, SUPERAMA, WAL-MART: Various proprietary labels.