W/ DD, I craved Krystal hamburgers - prior to being pregnant, I HATED Krystal hamburgers.
W/ both boys, I craved fruit (especially pineapple) & ice cream.
W/ older DS, it was just a sometimes craving, & I ate other foods.
However, w/ younger DS, I craved fruit & ice cream all the time - ice cream & fruit were literally the ONLY things I ever wanted to eat.
I never had morning sickness w/ any of my pregnancies, but w/ younger DS I had very little appetite, was never very hungry, & the only things that sounded good to me were fruit & ice cream. Cold, cold pineapple & Moose Tracks ice cream... that was my diet!