Earlier quoted context omitted.
The funny thing about all your links is this: That most people who lost weight most often times gained it back - yet you somehow think gastric surgery is the cure all when you have to make lifelong changes to your diet and lifestyles and be even more diligent in doing so? The weight loss for gastric patients levels off after 18-24 months, far shorter than the 5 year mark you use to measure success. I'm not sure how y…
Surgery works with a 5 year timeline too, for the average person. The average person does not succeed any other way. It's not impossible - 5% of people in these studies succeed - which is why you see anecdotes like yours.
"This study of isolated gastric bypass with a 5.5-year follow-up rate of 88.6% revealed a success rate of 93% in obese or morbidly obese patients and 57% in super-obese patients. " (note that this is a specific type of gastric bypass) http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1421028/