I think my DSs must be quite unusual when I read these threads?
DS1, now 26, wasn't a particularly big eater at home, although he did gain weight in first year at Uni. Probably due to eating more unhealthy/fast food than he was used to at home.
DS2 is 17. He's 5'10" and weighs 9st 3lb, which I think puts him in the healthy category?
For breakfast, he has 2 slices of toast.
Lunch is at 6th form - always a main meal with a slice of traybake.
Tea at home is the usual stuff - spag bol (or whatever other pasta dish), chilli, cottage pie, chicken fajitas. He has a bigger portion than me, but no bigger than his dad would eat.
He rarely, if ever, snacks. So the comments about making food at 4am, and eating entire chickens are alien to me.
I grew up with four older brothers, and there's no way my mother could have afforded for them to be eating a full box of cereal each in two days, or cooking them a roast chicken each to snack on!
My son has access to extra food in our house, he just doesn't seem to need it?
He's very sporty, but doesn't attend a gym (if that's relevant). He plays hockey at County level, and cricket at local level.