What can you do to decrease your chances of getting a brain injury?

I agree with Vanyel - also just be aware of danger. Pay attention to the chances of being injured, and don't do stupid stunts that could cause you to be hurt.

Another thing, if you're older and want to avoid a stroke, is to take one 81-mg aspirin each day. Don't do this if you're already taking medication blood thinners, of course, or without double-checking with your doctor to see if you need to do it.

Check your blood pressure often, also. People can have high blood pressure and not even know it, and that is a big risk for brain injury and heart attack. See a doctor if it's too high (normal is 120/80 and if you get to 140/90 it's too high)