Why is a diet high in amino acids important for building strong muscles?
Its because amino acids form proteins which in turn form muscle tissue. They also play an important part in processes like brain functions and recoveries from injuries according to http://www.muscleandstrength.com/articles/the-importance-of-amino-acids.html.
Amino acids make up proteins proteins go into muscle fiber. Try this link below.http://healthyeating.sfgate.com/amino-acids-muscles-6543.html