Ya I think ultimately you have to know your crew and which ones eat due to true appetite because they are active and burning a lot of calories and need it to sustain them and which ones have 'lost' their ability to know if they are full or eating cause they are bored and so forth.
I have two kids who often eat 3 bananas with at least 2 bowls if not 3 full bowls of yogurt in the morning - between my crew when I serve yogurt they eat two large containers - if I cut them off at two 1/2 cup serving by 10:30 in the morning I would be dealing with 'hungry behaviour' like aggression / irritability and so forth and we would all be 'suffering' with that as a result ... I know cause there have been times where my spouse ATE some of the yogurt and therefore I did not have two full containers to serve
My kids are fruit hogs ... they will eat the entire melon at one sitting - watermelon, honeydew, cantaloupe. I have to buy a dozen kiwi cause they will each eat two, two bananas per kid is common, pound of strawberries and grapes easy, two pints of berries like raspberry, blackberrie, blueberries and so forth ... seriously fruit HOGS!
But veggies too ... Monday afternoon they ate the entire bunch of celery done up as 'ants on a log' with peanut butter and chocolate chip and raisin ants .... those huge containers of cherry tomatoes at Costco - easily gone at a lunch unless I hide some to have in a salad another day. Fresh French green beans are popular here - cold right out of the bag either as snack or with lunch!