I wanted to chime in here to give another perspective.. first, of course you don't have to tell anyone you had surgery...its up to you to disclose you medical history. That being said, I tell everyone who asks. The reason being- I was soooo super scared of having surgery that I put it off for years and everyone I ever talked to about losing weight said that they did it "the natural way"..IT WAS A TOTAL LIE. I had people come up to me afterwards and tell me they had it done too but never tell people. I would have loved to to speak to more people who had it done and I wish I had done it sooner. Now I tell people who ask "how I did it" the truth. I don't care how they react but maybe I'll help someone who was like me.
Also I just had a revision surgery from sleeve to bypass and I plan on sharing that as well. Disclose what you would to who you like ...but remember how you felt before you had surgery & don't say it was "the natural way" if someone is looking for advice on losing their weight.