system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's happening in my brain that makes me want one food over another?

For example why would I be more driven to an apple than an orange and other days I'm driven to an orange instead of an Apple?

Or hot dogs over a salad.
gpt
I once saw some Discovery show (back when it was actually a learning channel) where they explained that sometimes you crave certain foods because your body is hungry for whatever nutrients that food has to offer. 

If you're craving something spicy, your body might be low on Vitamin C. If you're craving chicken or something meaty, your system might need a boost of protein.