I can't buy that as a legitimate theory based on everything I know about ALS. The cause of ALS seams to continue to be a mystery and I would think something as relatively simple as head trauma would have shown a stronger correlation by now. There is lots of research out there about it. Apparently ALS is unusually high among boxers, football players, soccer players and other contact sports. Can you point me towards anything you've read? I am pretty interested in the disease and have never heard of this. Can't point to anything I've read. Real Sports seems to have done several segments about it. Also, I've seen a documentary recently about Steve Gleason, the former Saints player who is now dying of it, and they talk a lot about it.