What is most likely happen to a person who is not getting enough essential animo acids in his or her diet

Essential amino acids are those amino acids which are not synthesized by our body. They are supplied through the food we eat.  If a person is not getting the required essential amino acids in the body, it will affect both physical and mental health.  In the absence of essential amino acid body breaks down muscle tissue to get the required amino acid, therefore muscle wasting is the first symptom of the deficiency of essential amino acids. Low level of essential amino acid may cause high anxiety.        

true, generally referred to as invasive species given that they have no natural predators in new environment