Although airlines don't provide special meals for flight attendants, there will still be crew meals.
It is impossible not to give food to the flight attendants.
Flight attendants on the plane have different positions, such as economy class flight attendants, business class flight attendants, first class flight attendants, kitchen flight attendants and so on.
You can use it to eat when delivering meals. When eating, passengers can take turns eating after eating without eating. There is no specific restriction on whether the standard of crew meals is economy class or first class. But personally, it is almost the same as economy class, except that sometimes we will come to eat extra air food when we are on the ground. So there is no specific boundary to define.
It won't be said that the flight is full, and the flight attendants will have no food to eat. The crew meal has nothing to do with the number of people, let alone the leftovers of passengers.