I’ve asked this question and was discouraged from trying it by my doc. Think about, don’t most of us do follow a pattern before surgery? We decide to go on a diet and deny ourselves, then we can’t take it anymore and we binge, then we feel guilty and go back to dieting, then something bad happens and we need that hit of dopamine so we binge. Binge, starve, binge, starve, never getting anywhere. Or at least that’s how it was for me.
Intermittent fasting creates a similar cycle. You do without for two days or so a week and then you eat whatever you want on the other days. Those “other days” quickly become cheat days and the next thing you know you’re back to your old ways. That bingeing can cause your sleeve to stretch too.