I agree with Paula, it could be a sign of deficiency.
Another thing to think about, is how much caffeine, sugar, and salt you consume. All three of these can make PMS worse and I imagine they probably have an effect on cravings as well.
I rarely get cravings, but this is what I do when it happens... when I crave something sweet I drink Good Earth tea (the original kind.) It is naturally sweet without having sugar in it. For salt cravings I go for pickles (but be careful there's lots of salt.) Other then that I try to get out of the house and do something to keep my mind off of food.
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