There are 2 big myths of WLS:
1. Dumping--people have these surgeries hoping for that negative feedback for their addictions. But if you don't change your head, nothing will change. You will still cheat with sugar. Whether or not your get sick. You will find a way to have your addiction. You can NOT depend on a TOOL to do the work if you use it the wrong way. And the real truth is that only 30% of RNY patients experiencing dumping and substantially fewer VSG peeps (maybe 3-5%?). And that dumping goes away sometimes the longer you are post surgery.
2. Restriction & Malabsorption--people believe their restriction and/or malabsorption will last for life and that they can eat anything they want cuz their "tool" will protect them and magically make them observe a moderate behavior. But moderate behavior begins with a choice in the brain and if you don't change your head, nothing in your behavior will change. People eat around their tool every day. I could eat an entire huge order of etouffee from Pappadeaux's if I ate a few bites every 10-15 minutes. I'd probably finish it within an hour! And I would have had 2 -3 days of calories in one meal. I could have a bite of Crispy Creme donut every 15-30 minutes and at the end of the day have eating 4-5 of them. I would not have dumped and I'd be craptastically full of sugar, carbs, and fat. I would have absorbed a ton of the cals. See where I'm going? In addition, both your restriction and malabsorption lessens the further out you are from the surgery.
WLS only ever was intended to give people a brief honeymoon period where they could lose substantial amounts of weight and potentially reset their metabolic health so that they could then go on to learn new healthy habits for living and behaving with food/learn proper nutrition practices and live a healthy thin life the rest of their lives.
Do your head work and let your tool do the job it's supposed to do. You are responsible for using your tool correctly. Don't bring a hammer to a screwdriver fight. Use your tool the way it's intended and it will serve you well--for life.