"Our results showed that a vegetarian diet is associated with poorer health (higher incidences of cancer, allergies, and mental health disorders), a higher need for health care, and poorer quality of life. Therefore, public health programs are needed in order to reduce the health risk due to nutritional factors."
Burkert NT, Muckenhuber J, Großschädl F, Rásky É, Freidl W.
Nutrition and Health – The Association between Eating Behavior and Various
Health Parameters: A Matched Sample Study. Gorlova OY, ed. PLoS ONE. 2014;9(2):e88278. doi:10.1371/journal.pone.0088278.