As I've posted before, imagine you have breakfast at home around 7 and head off to work 8-1. You then head straight to the ground. You leave the ground at 6 and get home at 7. You're away from home for 12 hours - that's why you might want something to eat on a Saturday.
There are numerous reasons why someone might need to eat at the ground on a Saturday beyond 'being a pig'. Only the true thickos fail to understand this point. Are you one of those thickos?
Apologies. Maybe I didn't make myself clear. I was referring to the majority of fans (and I think the majority are probably fortunate in not having to work on Saturday mornings) who can have lunch before they leave home for the game. Why do these people need to eat at the stadium?