Is it really necessary to wait for everyone to have food or one should have food whenever one feels hungry?

Haha I usually just eat first if I'm hungry and if it's a normal day. Most of us have separate schedules anyways. But if it's a scheduled dinner or a special occasion, I will wait for everyone. I can get quite hangry (hungry+angry) so if I have to wait for everyone, then I'd prepare a small snack just in case (like a bag of peanuts or some dried fruits).