Food is indeed pretty easy to acquire, and it is eaten even faster, with the feasting and all.
So I guess adding decay to foodstuffs would not really be a problem in general, as long as it does not decay too rediculously fast.
I'd still like to be able to sell some foodstuffs in my market stands, and not have them go rotten in it before they are bought however.
I can see some problems with certain foodstuffs that are saved up by people that are balancing stats. It would kinda suck if for example, your stock of Jorbonzola rots away, because you didn't eat it for a while, because INT was maxed out, balancing stats.
Or, you just bought a chest of cavebulbs, and find them rotten when you want to steam them.
Food decay, and consequently, methods of preservation could add nice flavour to the game, but it should be thought out well, and not overdone.
Now we need icy terrain, ice-caverns and the possibility to carve out big chunks of ice, to transport to our ice-cellars
