I want to make crystal clear, I do not claim to have all the answers here. I simply feel it is a VERY common mental problem these days among young men. I think it is based mostly in thier insecurity and the insecurity they project unto or assume others also have. I'll bet Chris thinks something like this "Man I just know it kills her to be seen with her body all flabby like that, I know I can help her..then she can be happy".
Edit: In other words he doesn't understand how someone/anyone could possibly be happy or unashamed of a less than ideal appearance. Because that is the root of happiness in vainville