well you need to balance it with the fact you are on a very low calorie diet, and cheese is high in cals and fat. Standard cheese shouldn't take you out of K, I had it a few times in the past (although a small amount, maybe a teaspoon or two)...
Its just making sure its not something you have too often. x
At the end of the day its your decision, if you want to do it you can. For example: I have 2 cups of tea every day on exante, it isn't enough to take me outta K, but it could be for someone else. You need to consider if the additional calories are worth it and could you do without? (I personally HAVE to have a cup of tea every day lol)