Humans have been consuming cereals and grains for thousands of years. Grains are composed of the bran, the germ, and the endosperm. They are further divided into whole grains and refined grains. Whole grains are unpolished and contain all three components while refined grains lack the germ and the bran, also minimizing their nutrition component compared to whole grains. Barley, Sorghum, Wheat, Oats, Brown Rice, Bulgur, Corn, Amaranth, and Quinoa are some of the most commonly consumed grains.