Weight loss surgery-do they work? Did it help change your mindset about food?

I was thinking of looking into surgery, but with the people I see or know of who had surgery have gained some or most of it back within a few years. Then what is the point?

Doesn’t it take a complete change of mindset to make any of this work? If so, how do you do that?

I was once told by a Psych 101 teacher told me that once I changed my “inside”, meaning my mind/thoughts/emotions the outside would follow. So, since my “inside” isn’t fixed is that why I don’t keep the weight off?