I only serve fruit and milk during morning snack and every body eats child size amounts. At lunch they eat as much as they want which is usually A LOT. During afternoon snack, I serve usually another fruit, dairy and/or a starchy food and they usually child size amounts. It's only during lunch when they eat A LOT and I do not limit the amount of food at that time or during morning snack (in the rare occasion someone wants tons of fruit), but in the afternoon if I see someone eating way to much I cut it off so they can have dinner with their family.