I keep smelling random foods, why?!

I'm in my room. I'm a really neat person, so I never leave dishes or any kind of food or beverages laying around except water. I also clean every week.

I don't starve myself, in fact I just ate. I don't deprive myself of anything and I eat pretty normal. Maybe not as healthy as I should but definitely not that bad. I'm also currently not craving anything. So why is it that I smell random foods? At one point I was smelling pasta, then I started smelling cinnamon, and now I smell cake/brownies.

Also, I didn't eat any of those foods today, nor do they even exist in my house right now. And I wasn't even thinking of these foods at all today. Is there a reason why I'm smelling random foods? Is it a sign of a health problem?