For those of you that are battling with obesity and/or diabetes, this is a very interesting presentation by Dr. Peter Attia at TedMed 2013. You can easily see that Dr. Attia is also a head shaver
But that's not the reason I chose this video. He has some interesting insight that was spurred by him becoming insulin resistant, despite being in good shape and eating correctly.
Enjoy the video!
http://www.youtube.com/v/U3oI104STzs?hl=en_GB&version=3