Pickles and ice cream? Actually it can get a lot weirder than that during pregnancy — and experts aren't entirely sure why. "There's no settled science on what drives cravings," says Dr. Hope Ricciotti, a Boston-based ob-gyn, associate professor of obstetrics at Harvard Medical School and author of "I'm Pregnant! Now What Do I Eat?" While some link cravings to missing nutrients, sometimes, like the proverbial cigar, a craving is just a craving. Here are some of the most frequent items on a woman's must-eat and won't-eat menus.

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