Ds is 5.5 and is and tall for his age but weight is normal. He does activities twice a week and is fairly active apart from that. Since he went back to school in September he literally hasn't stopped eating, and the constant bugging me for food is driving me slowly batshit.
For example, today he has had-
Breakfast- 2 Weetabix with milk and half a brown bagel with butter
Lunch- packed lunch of 1 small ham bap, a banana, handful of veg sticks, 1 tuc cracker
After school, he had a snack of a small portion of leftover pasta (about a cupful), then hounded me for a satsuma, then had a cupful of plain popcorn.
Then he had a good handful of sweetcorn, and then the shopping delivery arrived and I relented and gave him a mini choc bar in the hope that he would leave me alone for 5 minutes. But no, as soon as it was finished he was out nagging me for cherry tomatoes and other stuff that he knew the shopping man brought 
In between all of these he has asked for other stuff that I have refused.
Later he will eat a good sized portion of chicken and rice for dinner, and then probably ask for more fruit/toast.
I know I can't really complain as it's mostly fruit and relatively healthy stuff he looks for, but the constant whine of him looking for food is driving me round the bend. Not to mention that we are going through an increasing amount of fruit each week which is expensive.