Can I tell my girlfriend that she's not losing weight because she eats a lot of snacks?
Doesn't she realize she is eating a lot of snacks that cause weight gain?
I don't know whether she knows about it or not.
You are very straight forward with your friend about her weight, but it almost sounds like it is a put down. Be there for her if she is interested in actually losing some pounds and remind her you want her not to have health issues.
I told her that she's not losing weight because she eats a lot of snacks, she will find what works for her. She said she doesn't care about her health.
While you shouldn't put her down because of her weight, letting her know that she's eating a lot of snacks and that's why she isn't losing weight may be the wakeup call that she needs. If she doesn't want your help though, then you have to allow her to do what she wants with her body.