I Married A Fat Bitch

It’s a girl I’ve known for a long time, I went for a few years without seeing her and now she’s put on about 60 pounds. I want to help her lose the weight because I know she doesn’t like it. I like the old her as well. Please don’t bother telling me i’m shallow, cause she wants to lose weight too, from what her friends tell me, but she won’t talk to ME about it. How do I start the conversation?