I have been craving oranges lately?

Thats not the only thing that I eat, but thats all that I want. I just want out and bought an 8lb bag because I am craving them so much. Oh and orange juice, I drank a 1/2 gallon of OJ in 2 days. What is the deal, I cant remember the last time that I ate an orange before this. And I am not pregnant just for the record. Thanks