My 2 are 7 and 5 and all I hear is am huuuuuuungry. They always have free reign of the fruit bowl and have a good size breakfast lunch and tea.
In the half term I make them up a basket each filled with snacks for the day they can get themselves and once the basket is empty doesn't get refilled till the next day and anything left stays in for the next day. At first they used to eat everything but now they've got the hang of it.
The baskets are primarily fruit in today's basket we have.
An apple
Small bunch of grapes
2 tangies
Mini roll
Crisps
Belvita biscuits