How do answer a question about a Ex girls weight?

I was hanging out with this girl for a little while A couple months p I see her. She says, " Jason you lost a couple of pounds since I last saw you, But I gained 10 pound since then..." I replied, "The reason I lost the weight was b\cuse I was always out riding my mountain bike...." I never respond to her question b\cuse it was so loaded ?, She was fishing 4 a compliment. She looks fine, but she's not overweight by any stretch,,, She really needs to stop partying and get healthy by drooping the 5 out 10 pounds she has gained. I just shut up. about her wieght. Doomed if I do, Doomed if i don't. I felt like saying have more self-esteem, self respect for your body. Treat it right. I drink, have a good time but I also ride my bike at least 4 times a week. I love it, that how I stay fit, Get off your and get active...