Girlfriend's lifestyle?

I'm dating my girlfriend for seven months, and we are living together for five months. I have noticed that since we moved in together she has started to put on weight. She loves food and hates sports, and it's really starting to show on her body.

Last weekend we went to the water park, and she wore her usual thon bikini. Her belly fat was noticeably bulging over her bikini buttons, and her bubble butt was showing clear signs of cellulite.

I'm concerned thet if she continues gaining weight like that it could affect her health, and also my affection to her. I still find her sexy but I really don't want her to gain much more weight.

What can I do to iniciate her lifestyle changes?

Girlfriend's lifestyle?
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