My parrotlets eat about 2 tablespoons of veggies and about 1 tablespoon of pellets. I’m guessing on the pellets because I just check it every day to make sure there’s plenty. I give them 4 tablespoons of veggies and they eat about half of it. They snack throughout the day. Mostly in the morning when they wake up, in the afternoon, and then the evening. Just like we do.
The only reason a bird would only eat and poop is because they have no toys to play with and no out of cage time to explore. They’re very active, playful, and intelligent.