What do you tell other people if they ask about weight loss?

I do not want many if any people to know that I am going to have this surgery because I feel it is very personal and private., so I was wondering what can you tell people that sounds believeable when they inquire on what surgery did you have? or as to your weight loss? or about why your eating habbits have changed? Any ideas or personal exp. you want to share would help. Thanks!

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