Why do I sneeze after every meal post sleeve surgery?

Sneezing after meals is an unusual but not unheard-of symptom following sleeve gastrectomy. In many cases, it is related to the body’s vagus nerve response, which can be stimulated during and after surgery. This nerve is involved in digestion and satiety, and sometimes it can trigger sneezing, hiccups, or even a runny nose when the stomach fills with food. Another possibility is that eating more quickly than your new stomach can comfortably handle leads to pressure changes that provoke this reflex.
While this symptom is usually harmless, it’s a good idea to pay attention to the pattern. Eating slowly, taking small bites, and avoiding overeating may reduce the frequency of sneezing. If the symptom is persistent, severe, or associated with pain, reflux, or difficulty swallowing, I recommend discussing it with your bariatric surgeon to rule out other causes such as reflux irritation or narrowing at the sleeve.
The good news is that many patients find these reflex-type symptoms improve with time and careful eating habits. Staying in contact with your bariatric team will ensure that any underlying issue is addressed promptly.

This is a great question! Some people have some sort of "signal" when they are getting full after the sleeve or are too full as well. These signals may be different from patient to patient and not everyone gets these "signals". These may include sneezing, nose dripping, watery eyes, light cough, etc. These symptoms may present themselves by themselves or in combination. These are signals only, you need to learn to listen to your sleeve and not overeat to avoid these "triggers". I hope this helps. Warm regards, 
Dr. Alvarez