GMO CORN If the corn is local, fresh, & grown with organic methods & is non GMO it is fine to eat. Aflatoxin, a known carcinogen, can be found in corn stored for prolonged periods. This can happen even with organic corn. Try to check out how the corn has been stored before purchasing grits, polenta, popcorn, corn bread, polenta, corn starch, fresh corn (how is it grown?), maize for making corn tortillas. Certain brands of corn tortillas contain an endocrine disruptor called propyl parabens.