"Grains, also called cereal or cereal grains, are the seeds of grasses ... With the advent of agriculture in the early history of human civilisation, grain consumption became prominent, especially in developing countries. Grains constitute a major source of energy in most households today, and occupy the base of food pyramids. Examples of grains are wheat, maize, rice, barley oats, millet and sorghum." (Quoted from article)