YES! I have found that when I'm full, my nose starts to run. I don't know if it is my body's way of just telling me to stop eating or what, but it works.
Incidentally, my husband and sister, who have NOT had weight loss surgery, have noticed the same thing happens to them. I do not know the physiology behind it, though. Hopefully someone else will.
See my YouTube vlogs here: http://www.youtube.com/user/LiLtinee
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Starting weight: 297 / Goal weight: 140's / Current weight: 138-143
Lap RNY 3/12/2007 ~ Fleur-de-Lis tummy tuck 7/12/2010