I probably ABU, but I am fed up with having to respond to comments about my recent (large) weight loss.
I don't want to talk about it. I don't want to tell you how much I've lost. I didn't do it for your approval, I did it for me. I don't need you to congratulate me. All it makes me think is that the main thing you noticed about me before was how fat I was, and I'd like to think there was more to our friendship than that.
If you must comment, do say, 'You're looking so well. Is that a new dress/shirt/hat?'. If I'm desperate to let you know how much weight I've lost (and I'm not - I would rather gain it all back again than tell you an actual number, ever; I will go to the grave with my statistics) I'm sure I'll be able to work it into the conversation.
I know you're just trying to be nice, just trying to encourage me, but I don't want you to. I didn't need your encouragement to lose it, and no number of comments will help me keep it off, which is the really hard part. Please, let's talk about something less superficial and more interesting, and which doesn't remind me how large I used to be. I was clever and interesting then, and I still am, so please act like there is more to me than how I look.