No one's saying you don't have mealtimes, this all happens at a mealtime. You just don't overface them with huge (to them) one-shot platefuls and make them eat

No one's saying you don't have mealtimes, this all happens at a mealtime. You just don't overface them with huge (to them) one-shot platefuls and make them eat it with a combination of threats and guilt. They can ask for seconds if they want, strictly at the same mealtime, and it's obviously better for them to take less at first and do that rather than take too much because then they actually do have to eat it all. They will quickly learn not to undereat and expect to be allowed to raid the snack store later (not that we had a snack store as such, but even if I knew there was, say, a cake to be had, "consequences of your own actions" would be the phrase used while being firmly denied access).