It's to be agreed that the majority of people don't eat enough fruit and vegetables. Why don't we just ban all meat on flights (including fish and chicken) and serve fruit and veg?
Problem solved...nobody gets meat...LOL
dontaskme
I'll cite another radical reason...safety. A plane can't exactly be parked if a problem develops. One needs all their faculties in an emergency.
I can't think of more of a waste than drinking on a flight. Enjoy it on terra firma ;)