In the body, adequate protein intake is vital for virtually everything from healthy muscles, ligaments, tendons, organs, glands, nails, hair and most body fluids.  Beside water, protein comprises the largest portion of our body weight, and as such, the body’s requirement for protein is directly related to good health.  Additionally the central nervous system cannot function properly without amino acids, which are necessary for the brain to both send and receive information.As the body cannot store large quantities of protein, as an energy source, it must be consumed daily. Amino acids, which contain about 16% nitrogen, are organic molecules that form the basic constituents of protein. They come from protein rich sources such as meat, fish, dairy products and vegetables such as legumes, peas and grains. Shortages can lead to a number of health disorders, because under these conditions vitamins and minerals are left unable to fulfill their health roles in the body.Phenylalanine is an essential amino acid which plays a role in brain activity, mood and alertness.