...because their food is so delicious that I end up eating most of the groceries that I hoped would last a week or so, in about 48 hours!
Por ejemplo, I buy two boxes of their fruit popsicles and a carton of their dark chocolate sea salt almonds because that will suuurely tide me over a week in the treat department. And when the aformentioned costs all of 10 bucks altogether you justify saying, "Oh, at that price I could eat all of this in a day! Not that I would or anything. What am I? A glutton?... ha ha ha..."
BUT what happens is that you do.
(Well, in 2 days.)