Adrenaline and noradrenaline promote alertness, activity and mood elevation. Glycine is an inhibitory transmitter, which with GABA can help to prevent the seizures of epilepsy. Dopamine is essential for initiating and coordinating the libido responses. Histamine aids the thalamus in sensory integration. Proteins are made of amino acids, and are critical to proper brain functioning.
Proteins contain nitrogen, which other foods lack.
Twenty-two different amino acids are known. All but nine of these acids, however, can be made by the cells from fat or sugar combined with the nitrogen freed from the breakdown of used proteins. The nine which the body cannot make are call essential amino acids. This means it is essential that they be present in the diet if health is to be maintained. These nine are tryptophane, lysine, methionine, phenylanlanine, threonine, valine, leucine and isoleucine.