I would maybe give less at lunch, if you are allowing thirds. I usually give a nice sized portion for their age and IF they clear their entire plate maybe an item or two to follow but not a second full portion. I also do a snack in the pm especially for those who are coming from school, seems they are famished by the time they arrive, however, what I offer is small and sensible no big snacks and nothing too filling. I will cut up a plate of apples and offer a cup of milk, or veggies of some sort, but a small snack is important for pm... I do not like the fact that a child could go home with Mom and Dad and not want the only meal they have together. Their is nothing wrong with kids being hungry. I think too many people don't set limits for kids. perfect example, when we make cookies I will give one or two to each child depending on their age, say 1-2 years will get one nice sized choc chip cookie and a drink, and 3 and older can have 2 cookies....I think that is reasonable, the amount of sugar is clearly more than they need, yet certain ones (who I know eat until they are full at home) will ask and ask for more. Nope, what I give is what I give, you eat to survive, to feed your body, you don't eat to feel full.