WCF
you are technically right. But the problem is that the vast majority of F/A don't have that problem, so it is unlikely they are going to fight for this. It seems more something that unions should try to solve within your airline, I mean try to change the mentality. Because if pursers act the way you describe, sure they had the input from management. I think it shouldn't be too difficult to make them understand that it is better to have happy rested F/As rather than hungry and unhappy ones, for the same price, just matter of organization. You CAN't work properly without eating and "decompressing" for 10 minutes. Happens to ALL human beings.
In my company there was that rule F/As couldn't seat in attendance time during longhaul flights (I mean while the other half of the crew was having their rest).
I think that F/As are not horses, so starting from day 1 let people sit in dead times. No use making all F/As stand during the night flights when all pax are sleeping and two F/As are largely enough for monitoring the cabin/toilets and answering calls. If you need 6, six stand, if it is quiet they can sit, and answer the calls in shifts. After a while this idea got into the thick skulls of the deskflyers ( I am referring to those who make the rules for the flying people whitout having an idea what it means to fly. We should start a topic about it) who allowed it. Funny the supervisors were going around spreading the good new when everybody was already doing it. Deskflyers should fly more, otherwise they get there last.
Do you have rest periods in long haul? The JAR require crew rests for long flights. Our new aircrafts arrived equipped with Lower Crew Rests with bunks according to the JAR.
It costs the airline a little, but an happy well rested crew adds value to the product the company sells. As Gordon Bethune says :" You can make a pizza so cheap no one will want to eat it".