My Wife & I are just starting to go full Vegan, we have been on a whole food diet for the past year.  We started by being more particular about our sources of animal protein (grass-fed beef, free range chicken and wild caught fish), but a friend recommended that we watch Fork's over Knives and now we are preparing to eliminate all animal products from our diet.

My concern is that my wife's Dr. has said for years that she avoid soy products (fabroid tumors (sp)), I have read a number of articles that men should avoid soy, effect on hormones and fertility.  How important is soy as a source of protein and as a meat substutite to a vegan diet.  What other options are available to address these concerns?