What makes us crave certain foods?

I keep craving coke after I play tennis, however I very rarely drink coke.What makes us crave certain foods?
Our bodies tend to crave what it needs. Your thirsty after tennis and crave a sugar jolt. Our cravings aren't always good for us.
i think you are rather in the habit than craving
Cravings occur when the body perceives a deficiency of some minerals or nutrients that one is used to., or when there is sudden exhaustion from occasional loss of any essential nutrients.
unless you are pregnant