Physiological Needs

Man is a wanting animal—as soon as one of his needs is satisfied，another appears in its place.This process is unending.It continues from birth to death.

Man's needs are organized in a series of levels—a hierarchy of importance.At the lowest level，but pre-eminent in importance when they are thwarted，are his physiological needs.Man lives for bread alone，when there is no bread.Unless the circumstances are unusual，his needs for love，for status，for recognition are inoperative when his stomach has been empty for a while.But when he eats regularly and adequately，hunger ceases to be an important motivation.The same is true of the other physiological needs of man—for rest，exercise，shelter，protection from the elements.(https://www.daowen.com)

A satisfied need is not a motivator of behavior!This is a fact of profound significance that is regularly ignored in the conventional approach to the management of people.Consider your own need for air.Except as you are deprived of it，it has no appreciable motivating effect upon your behavior.