Chuck & goat guy are right. Do not allow bears to get their lunch on your property or you won't get rid of them. I live in south central Alaska where there is a heavy black & brown bear population. Bears constantly roaming through town getting into dumpster, dog food, etc. Once they get a meal they keep coming back until they are trapped & moved or put down. I don't have any experience composting (yet) but I would defiantly refrain from any meat, cheese, ect. In your pile with bears around. My friend has a salmon spawning stream running through his yard and ALWAYS has bears roaming through. He is getting a dog to help with this problem so we'll see how much this helps. I doubt they will completely stay away but it may help deter them a bit.