It might be what is called your Soft cue.
soft cue: Is that post gastric bypass little message your body tells you when you have had enough - for some it's a sneeze, a runny nose, hiccup, sigh, yawn. If you recognize yours quickly you can avoid overeating and potentially losing what you just ate by not taking "just one more bite."
I think mine is hiccups
Just found this post that I did a while ago HTH