Crave

I could fucking kill for a pack of Tangy Cheese Doritos round about now.
Like a full pack, all to myself. Fuck yeahhhh.

Why do people get cravings for food?

I've looked it up (wikipedia lol) and apparently there is no one explanation for it.

Is it a desire for the release of hormones that those foods give us?
Or is it a want for a certain feeling that we remember having when eating those foods?
Or is it just hormone fuelled? An imbalance causing a strange brain signal?

But whatever the reason, a craving shows you what your body really desires, without the brain consciously knowing about it. Similar to an addiction.

You never really know when you are addicted to something, until after it's gone.

What would the world be like, if everyone just spent their time trying to fulfill their cravings?
Would people be more sane? Or insane?