Pregnancy cravings can get the best of an expectant mama. A chocolate bar here, a scoop of peanut butter there. Researchers say that a woman's desire for certain foods represents her body's lack of certain nutrients. For some mamas-to-be, the cravings can create an entire lifestyle change.

For Tiffani Thiessen, who is due with her first baby this Spring, having a bun in the oven is wreaking havoc on the vegetarian's diet. She told People,

"I was a vegetarian for many, many, many years and all of a sudden I started to crave red meat. Crazy enough, I had a steak before I left tonight and I would never have eaten one before. One day I just woke up and craved meat."

Adding meat to a previously vegetarian diet can be tricky – often requiring gradual introduction in an effort to not disrupt the digestive system. If you stuck to a nonmeat diet, did you stick to it during pregnancy?