Very interesting until I got to the word "toxins". At that point I stopped reading. Any time you use the word "toxins" my pseudo-science radar turns on and my ears/eyes turn off.

It turns out that the paper referenced was written in 1995 (yes, 20 years ago), in the Journal of Range Management which was discontinued in 2004 (11 years ago) (http://www.researchgate.net/journal/0022-409X_Journal_of_Ran...) it was an invited article (ie. probably not peer reviewed although I cannot tell for sure) and it appears that author has no medical training. The author "is currently a professor in the Department of Rangeland Resources." This professorship seems to have ended in 2008: https://www.cnr.usu.edu/files/uploads/WILD%20Vitaes/Provenza...