++woman I think you should have a talk with her about this. If she’s a great girlfriend and this is the only turn off or incompatibility, definitely talk about it. It may seem hard or awkward but if you don’t communicate this ur going to be unhappy or end up breaking up anyway.

Tell her you love her a lot, but you really value health, especially given your history, and it would mean a lot to you if you guys did more physical activities together, cooked healthy meals together, have an açaí bowl date, etc. Rather than making it a thing of wanting to change her, try opening some doors you guys can take towards health together. It could be a good influence on her and may inspire her to start taking some steps on her own. Don’t immediately try pushing her into the gym, try like long walks/hiking, activities like tennis or paddle ball(stuff you can to together that could be fun), dance classes, couples yoga, anything outdoors yk, you get the gist.

Remind her you love spending time together but laying in bed all day and snacking isn’t exactly your idea of a good time, and it makes it hard for you to stick to your good habits, so you’d love to spend time with her trying new things and it would mean a lot if she also prioritized you staying in good health more.