<human>: I'm looking for some outside advice of what to do here.

Okay so me and let's call her Emma started to see each other around 5 months ago. We're not officially dating. (I moved right after I met her but we went on dates before and I come back to visit since she also lives where my family does and I'm close) 

She is a very attractive girl and is by no means overweight, but definitely wouldn't be called slim. Anyways even in these 5 months I've realized that she definitely doesn't take care of herself as well as one would hope and it's kind of showed in her physique. I am by no means super fit, but I definitely eat very healthy and try and take care of myself to an extent. 

Emma is a very nice girl and I really like her. I do not date a lot and she has had some long term boyfriends before so we have been trying to find out how we approach the relationship which has been a little weird, but not that bad. 

Anyways I'm not super invested in the relationship (emotionally, due to some other reasons I would rather not get into right now) so I came here for some helpful advice to find out if this is the kind of thing that I should consider a deal breaker or just talk to her about. Having not been in too many relationships myself I don't know where to start. I obviously can't try to tell her I've noticed she's gained some pounds, but I don't think she'd want to join me in an active type lifestyle. 

If you guys have any information on how I should handle this or or advice in general it would be appreciated.

Summarize the given text in a few sentences.
<bot>: Dating girl that isn't as healthy as I'd like her to be. Not sure to approach subject or end it.