Runny nose or sneezing after you eat is very common in WLS patients. Our altered anatomy makes us subject to "Gustatory Rhinitis" or "Snatiation". When we get full, it triggers a reflex and makes us sneeze. Not everybody gets it, but I sure do! Plus, I don't even have to eat until "full", sometimes just a little snack will make me sneeze like 6 or 7 times in a row!
It was horrible when I worked in an office. I swear people thought I was typhoid mary. I work from home now, so it's just me and the dogs sneezing and snorting away. My family just kind of jokes about it saying, "one more, mom, just one more."