Steve Jobs, January 5, 2009 (http://www.apple.com/pr/library/2009/01/05sjletter.html):
As many of you know, I have been losing weight throughout 2008. The reason has been a mystery to me and my doctors. A few weeks ago, I decided that getting to the root cause of this and reversing it needed to become my #1 priority.
Fortunately, after further testing, my doctors think they have found the cause—a hormone imbalance that has been “robbing” me of the proteins my body needs to be healthy. Sophisticated blood tests have confirmed this diagnosis.
Some random article on hormone imbalance (http://www.thefamilyhomestead.com/hormoneimbalance.html):
A second factor that leads to hormonal imbalance is liver health.