Reed Mangels, PhD, RD, answers this question in her recent Nutrition Hotline column that runs in each issue of Vegetarian Journal.
To see the entire article go to:
http://www.vrg.org/journal/vj2015issue4/2015_issue4_nutrition_hotline.php
To subscribe to Vegetarian Journal visit:
http://www.vrg.org/bookstore/index.php?main_page=index&cPath=3