A Desire To Eat

I leave you with a fact that I hope becomes a thought:

Our desire to eat stems from two different sources. The first source is hunger, which is our physical, biological drive to eat. The second is appetite, being our psychological drive to eat.

Now, think about this for awhile. Does one play a dominant role within your personal choice process? Should they have equal positions? What should our desires be based on? Should we obey?