I only told ~ 5 people--my closest, inner circle friends--including the two men who helped me: One guy took me to surgery and dropped me off at the other guy, who kept me at his place for 3 days post-op (and took me to the doctor's office for my 2-day post-op visit [my VSG was out-patient]).
Months later, when I resumed eating out, some friends later noticed that I was eating small meals, ordering appetizers only,a nd even having to take some of that home. They'd also noticed my weight loss. I said, over the past months I'd limited my portions and went mostly high-protein. Facts.
You don't have to tell anyone you don't want to tell. Besides, some are ignorant of the 'whys' of having wls, or that wls is 'the easy way out,' etc., and you don't need naysayers who may not understand and lack knowledge of the struggle.