I´m not sure how to answer the question. I tried to work out +- how much my birds ate before, but I gave up. I offer 1tbsp pellets and 1tbsp seed mix in the pairs cages (except one who have a silo constantly full), my youngest gets 1sp of each. And I offer big bowls of veggies, probably too much, but at least they can rummage around in it and eat as much as they like. If I see the dry food bowl empty I tip out the hulls and refill it. I refill it every morning.
My youngest gets additional veggies before bed, because he loves them so much.
Basically, there´s always food available to them. None overeat and all are active.