Cereals, the major group of grains, are grown on nearly 60% of the cultivated land in the world. This category mainly includes rye, oats, barley, wheat, rice, maize, millets, and sorghum. Cereal-based foods are the most important staple foods for mankind. They contain the major macronutrients (carbohydrate, fat and protein) required by humans for growth and maintenance. Cereals also supply important vitamins, minerals as well as other micronutrients essential for good health.