Grain crops, or cereals, are by far the most important sources of plant food for the human race. On a world wide basis, they provide two-thirds of the energy and half the protein of the diet. These crops are: wheat, rice, maize (corn), oats, barley, rye, sorghum, and millet.
Source: The New Oxford Book of Food Plants, xvi, 1997, by J. G . Vaughan and C. A. Geissler.
Contributed by: Zaady