Besides the health benefit, what is the game effect of "stores 50% of food after growth"? 
I recall how granaries worked in previous Civs, but I don't see any storage area in Civ4. What does storing food do? What is "food after growth" and how is it calculated?
I apologize for my apparent ignorance here, but this just isn't clear on its face to me. Thanks for the help!

I recall how granaries worked in previous Civs, but I don't see any storage area in Civ4. What does storing food do? What is "food after growth" and how is it calculated?
I apologize for my apparent ignorance here, but this just isn't clear on its face to me. Thanks for the help!

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