I've dealt with depression before, loosing weight is not a way to fix that. For me it was a side effect as I lost my appetite and anything that sounded fun wasn't no matter how much my friends tried to lift me up. Depression is like losing a loved one, except that loved one is yourself and it something the brain battles very hard with. You spend hours rethink things to the same end and reliving all your short comings and questioning everything around you. Everything that in a normal state seems bad is worth trying. I will digress because this is about an amazing and talented mad taking his life.
Sometimes we forget to mention how much someone has touched our lives or what they have done for us to make our lives better. Many stars will say money doesn't make you happy and its true. I won't pretend to understand the life of someone like Robin Williams. Sometimes good reviews and ratings don't make actors happy, I am sure Williams hasn't heard an outpouring from fans like he got today in a very long time. Remember to be thankful and everyday reming those your love and everyone else around you that touches your life how special they are.
RIP and we will keep laughing forever