I'm 23, how would I know if this surgery will not mess me up 20 years from now?

I want this surgery and went as far to get a Dr appt with a surgeon, but what I'm wondering is 20 years from now, would I have bad effects from this surgery? Also, how do you put in your mind that this 1 ounce food pouch is what I want to live with for the next 40 to 60 years left of my life. Can anyone help me and if you thought about this and still had the surgery. How do you know this surgery would help you that far in the future? Thanks and I appreciate your help and advice!

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