A grain of wheat is composed mainly of germ, albumin and cortex. The latter, in turn, consists of three layers under which it is found, in a more or less solid state, depending on the degree of humidity, the albumin full of starch. At the point where the albumen becomes very consistent is a small and hard seed, shaped like a walnut, the germ, that is, the part from which the future plant is to be born. The cortex protects it against the outside and the albumen layer will feed it until it has its own roots with which to extract its food from the soil. All other cereals have the seed made up according to the same principle, and they can all serve equally well in the production of bread—barley, oats, rye, millet, and even corn.

Wheat differs from other cereals, in that it is the only one that contains the whole series of vitamins of group B, without which life would be unthinkable, and that is why bread is considered from ancient times as "the daily food".
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