I'm thinking about making fun of my girlfriend's unhealthy food cravings.
Why do you want to make fun of your girlfriend?
I'm worried that she's going to get too fat and I'll have to break up with her.
You should not make fun of your girlfriend about food. Encourage her to eat healthy if needed.
You need to learn how life works. You can't force people to eat healthy.
You don't have to force her, just encourage her to try new, healthy things. Bullying her isn't going to make her want to eat better, it's only gonna make your girlfriend resent you and maybe even break up with you. How would you feel if your girlfriend made fun of you for something you're sensitive about?