How do I tell my girlfriend I would like her to lose some weight?

Since I have gotten with my girlfriend she has gained a significant amount of weight. I really do love her, but I just don’t find heavy women attractive at all. I’m not trying to be mean, but that’s just how I feel about that and we’ll leave it at that. Is there really a nice way to ask her to start working out and eating healthy.
How do I tell my girlfriend I would like her to lose some weight?
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