This will be a quick diary, but wanted to pass along this news.
First, the authors of the study note that theirs is "the first time a comparative analysis" such as this has been done. Wait, what? Isn't this stuff already being grown around the world and eaten by many? Sorry to spoil your dinner.
Second, many many moons ago I used to work on this issue for U.S. PIRG. I wanted to see if an article I wrote for them in 2000 is still on the internet, and lo and behold, I found it. I point this out not to claim I have some authority on this subject -- I haven't worked on it for many years, and do not follow it very closely any more. I merely point it out to note, sadly, that in 2000 there had been essentially no research done, and 10 years later, it still appears to be the case.