Thanks for all the comments, it's good to hear different opinions. Sorry if I've stirred up something I shouldn't have, just didn't want to ask anyone in real life, because I didn't want to upset anyone else- my friend seemed upset.
I will add, because it wasn't very clear in my first post, that because I didn't want some chocolate, my friend probed and that's how it came up, I didn't bring up trying to be healthier myself, on the whole I think it's a personal journey, and like others have said, I normally only discuss it with my partner.
Also both my friend and I are obese, so I'm very aware my weight will be impacting my health and I don't think that's fair to myself, to my family or society- statistically obese people cost the NHS twice as much.
I do "love myself" to use the phrase the body positive movement use, and I don't think you should hate yourself because you are fat, but I can be happy in my life and recognise I need to lose weight.
Going forward, I'll just try and steer away from the topic quicker if it comes up again.