Athletes require a variety of protein sources to maintain and repair Muscle structure as well as provide the energy supply needed for muscle endurance. Vegetarian athletes often turn to soy based proteins since these are notably high in protein. However, soy has gotten a lot of negative press for its effects on hormones, particularly for women. This is especially true if it becomes one of the main sources of protein in their diet. For this reason, many vegetarians choose to consume a soy-free diet or significantly reduce their soy intake.
from Breaking Muscle http://ift.tt/2mpsPdI