People usually choose to be vegetarian for "animal rights" reasons, not health/medical concerns (though those two are certainly contributing factors). It seems

People usually choose to be vegetarian for "animal rights" reasons, not health/medical concerns (though those two are certainly contributing factors). It seems unlikely that there's some self-selection going on since a view on animal rights has little to do with having a stroke and is probably wholly unrelated. That being said, I suppose it's not good science until we consider all potential contributing factors until we can prove a casual link. I just think that a nutritional explanation is more likely than something else (say, genetics).