Everything in Moderation

We were walking home from the store last night, Sasha and Ben in the wagon and Sam walking beside me when the following conversation ensued:

[Ben jumps out of the wagon]
Mom: Shew, this wagon is sure a lot easier to pull now!
Sam: That's 'cause Ben is full of so many calories!
[Ben gives Sam a dirty look]
Sam: What?!? It's better than transfats!