"Clinical researcher and author Neal Barnard, M.D., is one of America's leading advocates for health, nutrition, and higher standards in research. As the principal investigator of several human clinical research trials, whose results are published in peer-reviewed medical and scientific journals, Dr. Barnard has examined key issues in health and nutrition."

 -- PCRM website, retrieved September 12 2012.

Dr. Neil Barnard, biographical sketch at PCRM.

Dr. Barnard is a proponent of a purely vegetarian diet, i.e. one that includes only fruit, vegetables, legumes and grains. He classes "nuts and seeds" separately and recommends adding them in moderation. See section on the basics.