It's been proven you can't wait for the NFL to warn you of the dangers. You have to be proactive, which is what Borland says he is doing.
"I feel largely the same, as sharp as I've ever been. For me, it's wanting to be proactive," Borland said. "I'm concerned that if you wait till you have symptoms, it's too late. ... There are a lot of unknowns. I can't claim that X will happen. I just want to live a long healthy life, and I don't want to have any neurological diseases or die younger than I would otherwise."
http://espn.go.com/espn/otl/story/_/...njury-concerns