In my local newspaper, the Washington Post, there was an article that said too much TV could rise the risk of Alzheimer's, according to one study.
They followed 25 people, and those who were couch potatoes had more issues with memory than those who were active.
I really believe that. I have been semi-grounded for the past two month due to an injury and I noticed I just can't think as clearly as I did before. Thank goodness I am able to go to the office in the morning, otherwise my mind would be really like oatmeal. Now I am overthinking all of this, and I need to stop doing that :P