Is it normal to crave baking powder? The last month I have been eating it out the can!

At my WIC interview they asked if I'd craved dirt, clay or laundry detergent!  Apparently the cravings indicate a need your body has for nutrients that are predominant in those substances.  Usually craving dirt means you are iron deficient.  Increasing amounts of red meat, beans, lentils, and even some cereals can help balance those levels.  If you are very low on iron you may have anemia.  It's important to tell your doctor about your cravings. Especially if it is for something you shouldn't eat.