Whoopie is right. That's the only way to do it. However, the second she realizes it's because YOU want her to lose weight, it's going to embarrass her and she won't talk to you anymore.
Ask her to go hiking with you or join a weekly kickboxing class because it's something YOU enjoy and want her to be involved in. Not because you want HER to get healthy. Then, if she does get involved enough to start having positive results (which is PROBABLY not going to happen, but just in case) then only COMPLIMENT her on how much she's glowing. How she looks so healthy, her skin shines, all that. NOT how much weight she's lost.
She'll start feeling better and associate her new confidence with you.
And, Chief, I'm not a feminist. I'm not anti-feminist. I'm humanist.
