This source of food was essential for man’s existence, since all cereals ​ — including wheat, barley, rye, oats, rice, millet, sorghum, and maize — ​ contain starchy carbohydrates that the body is capable of transforming into its principal fuel ​ — glucose.
Sumber pangan ini sangat penting bagi kelangsungan hidup manusia, karena semua sereal ​ — termasuk gandum, barli, gandum hitam, havermout, beras, sekoi, sorgum, dan jagung ​ — berisi karbohidrat yang mengandung pati yang dapat diubah tubuh menjadi bahan bakar utamanya ​ — glukosa.