I'm not sure - but ikea is known for being EXTREMELY efficient and environmentally conscious.
So between that fact, and the sheer taste / digestibility - I'd say their food consists of their bulk shipment packing materials.
That said - the Stoughton, MA store had Swedish "meatballs" and "hot dogs" at the check-out station. And they had a cafeteria upstairs in the store - that had a couple more items than the check out - but disturbingly, the same Swedish "meatballs".