I normally have mild post nasal drip but a daily saline rinse makes it go away.
I started to notice that when I drink a bottle of Soylent 2.0 my post nasal drip comes back within 15 minutes.
To be sure, I alternated for a week having Soylent twice per day and just solid food three times per day and recorded the results.
On the days where I had Soylent, post nasal drip came back after each serving and stayed for four to six hours after.
I wanted to find out if it was an allergic reaction, so I went to Stanford’s medical team and asked for an allergy blood test, which tests for many common allergy causing foods, and the test results showed no reaction to soy.