I've lost 60lbs+ because I'm sick....how do I answer the questions that go "oh my god you look so great! How did you lose the weight??"?

I don't know if I have an autoimmune disorder, an auto inflammatory disorder or what...but for the last 3+ years I've been dealing with a lot of symptoms and towards the end of last year I lost my appetite and started dropping a ton of weight really fast. I definitely had more than 60lbs to lose.

it stopped for a while and now it's back again. People keep asking me how I did it...some have asked me nicely...some rudely. People keep telling me how amazing I look, and literally pointing out how much weight they think I lost...which is really frustrating when they say it with such a shock in their voice.🙄. What do I even say to these people? "Diet and exercise"? Or "I just don't eat anymore🤷‍♀️".