How to ask husband to shape up?

My husban has a large rump. Especially for his small body (he is 5'4". Voted smallest Youth Minister in Maine 2009). He has what looks like a large 'black girl booty'. His chest is 29" size even with that large of a rear. I initially didn't have so much a problem with it but lately I think its been getting worse and is causeing me lots of embarrassesment when we are at church or out and about at Hulrdren's or something. I think people must think he isn't going properly or is eating large amounts of hardee's or something. During our New Years trip to Chicago we were supposed to ride the ferris wheel at Navy Pier but he couldn't fit in it so I had to go on my own. He ended up all mad that he had to spend all day on his own because I wanted to ride it so many times. It was so annoying. Is thre any way to surgacally do something about this or perhaps slip in a wieght loss pill to his ceral in the morning? He isn't too keen on slimming but I want him to or I will divorce him and our child.