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Sorry, more to add. Cravings are real. But if you start craving things like dirt, detergent or anything nonedible, call your doctor immediately. It's a disease called pica and your doctor needs to know right away. PLEASE do not eat any nonfoods!
I was always told if you are craving something it's your body's way of telling you it needs something that is in that food, like calcium or a specific vitamin.