The concept of sustainability in animal nutrition is meant to reduce both feed and food wastes. Livestock production systems have received growing attention in recent years since they have clearly been identified as a deep environmental impact factor. Moreover, cost of animal feed represents up to 85% of the farm gate value of several farm animals. From this perspective, sustainability in livestock productivity cannot be achieved without using sustainable animal diets. Corn meal/grain and soybean meal were identified as the major feedstuffs used to formulate animal rations, which are also meant to be human edible materials.