“About 2,000 pounds of grains must be supplied to livestock in order to produce enough meat and other livestock products to support a person for a year, whereas 400 pounds of grain eaten directly will support a person for a year. Thus, a given quantity of grain eaten directly will feed 5 times as many people as it will if it is eaten indirectly by humans in the form of livestock products.” - M.E. Ensminger, Ph.D.