Trumpet players and food are 2 things that fit perfectly together (many of the finest players are not underweight......)!
In my 42 years of playing, I have found things that help and hurt me when I am on stage.
What generally helps is a plate of pasta before playing. The starch gets turned into sugar easily and I don't get tired an hour after eating.
Black tea makes my lips "tough". I believe that is due to the tannic acid.
A small glass of wine has been known to work wonders before a Brandenburg Concerto (especially if I am filling in for someone that chickened out and only gave me 10 days notice).
Hard alcohol (even in small amounts) has always been very bad news for my endurance. I think it dialates the blood vessels and keeps from replenishing the cells with oxygen.
What experiences have YOU had?