No its not. CICO, it's that simple. I'll get down voted by the fanatics that say it's more complicated, but it's not. Eat less and exercise more and you will loose weight. A gastric bypass is just a extreme form of this. You cannot avoid the laws of physics.
There's a reason your being down-voted, and its not a hive mind, or a conspiracy, or a personal grudge against you. That's simply what it is like to be "wrong". Saying what you said is just playing the victim card.
I'm not a victim don't worry. I have no interest in being right -- though that you think I'm playing a victim card plays into all the people that deny CICO.
But it's ok. I loose weight by exercising and eating less. Like the climate change denialists, you can lead people down the dark path if you like.
Me I'll stick with me 3kg loss of weight every month and celebrate.