I've only found 40 caches so far, so I suppose I'm still a newbie, but in those 40 caches I've found 4 with food (homemade molded chocolate, peppermints, Hershey's Kisses, other assorted candy). It's pretty clear that food in caches is a no-no.
Any reasonable person wouldn't eat food left in the wilderness by a stranger, so why would someone leave it there? And when I get to caches that have food in them they're almost always covered with ants making the process of logging alone difficult, and trading goodies even worse.
I've always removed all the food and thrown it away in the nearest trash can, and have tried to leave a note in the online log that I've done so just in case the person that left the food is checking to see who might have "enjoyed" the snack. Hopefully they'll read my notes and decide not to leave food in the future.
I guess I'm just surprised to find food in 4 out of 40 caches so far. Is anyone else finding food this often?