I assume you mean 'grains' as in cereal. Cheddar cheese does not have these grains.

Cereal grains are grasses cultivated for their edible seeds.

Whole grains are cereal grains that contain cereal germ, endosperm, and bran, in contrast to refind grains, which retain only the endosperm. Whole grains can generally be sprouted with refind grains generally will not sprout.

By pounding

Hi, whoever you are. Cereal is grains, different grains such as wheat, corn, etc.... combined together to get your corn flakes, Cornmeal porridge, Hominy Corn Porridge,etc... So to answer question Cereal is originally from wheat grains and corn.