A position state of the Academy of Nutrition and Dietetics on vegetarian diets was recently released. It concludes:
It is the position of the Academy of Nutrition and Dietetics that appropriately planned vegetarian, including vegan, diets are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases. These diets are appropriate for all stages of the life cycle, including pregnancy, lactation, infancy, childhood, adolescence, older adulthood, and for athletes. Plant-based diets are more environmentally sustainable than diets rich in animal products because they use fewer natural resources and are associated with much less environmental damage.
Here is the article:
Thanks to The Christian Vegetarian Association for including this in their newsletter. You can subscribe to their newsletter and find out more info at http://christianveg.org