Corn bread is made from corn meal and one of the ingredients in cornbread is baking soda. Baking soda is an alkali very much like the lye used to make homini. So we have treated the corn meal used to make corn bread so the nutrients in cornmeal are available for human digestion.
The yield of corn or New World maize was so much higher that the traditional European crops of wheat, barley, rye, oats, etc that New World maize was thought to be a miracle crop because it offered to end the recurring famines that plagued Europe ever since the first European first scratched the Earth with a sharp stick.