I probably spend more than a lot of people do, solely because I bake as a hobby.
As for how much I spend a day, that's a tricky question for a few reasons, but if I were to take out certain things that would make it hard to calculate... I would say I probably spend about $3/day on just desserts I make.
edit: $3/day minimum, average would be higher. As for other foods, that is currently not possible to calculate since I'm not paying right now.