George,
I believe zinc on an empty stomach is mainly a problem on the overnight-fasted empty stomach.
I take my ZMA combo before bed as well, food has usually been in there 1+ hours, but no one will catch me stressing and staying up late worried about taking my ZMA too close to food.
If anyone knows of a study that demonstrates the increased effectiveness of ZMA when taken with/without food, please post, I don't believe it exists.
Avoiding the combo of calcium or dairy with ZMA is likely a good idea.
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