i thought if you didn't oil it, that the spoon would absorb the "food" and therefore turn rancid???
most woods seem to have natural antibacterial qualities, researchers don't understand why but bacteria don't breed even in old boards covered in knife cuts...unlike old plastic boards. This is often quoted but if you want to see the original research I have a copy on my website here http://www.robin-wood.co.uk/catframe.htm under "using woodware"