Any advice on how to help my (23) gf (21) with her weight insecurities?

My gf has always been overweight and of course I love her but she’s been insecure about it almost her whole life. We’ve been together for about a year but she seems to always feel bad about her self even when I compliment her. I don’t make jokes anymore that could even mention something about her weight or that I would love her more if she was smaller. Is there anything else I can do?