The Human Body is in a constant flux with the environment. Matter and molecules flow in and out, casting themselves into its complexities. Although the body lends them structure, it is the intake-the diet-that decides its physique. To control what goes in a diet is to choose what stays inside. Dietary decisions reflect an awareness of metabolism and the nutrients needed to modify it. There may be a host of diets purported for each activity and illness. However, the one macronutrient that is invariably required, in substantial amounts irrespective of the physiological state, is protein.