Jake, that was the question that I was thinking to ask exactly today!!!
I weighted my (large) apple and the scale said 0.9 oz (257 g)
So I counted it as 3 blocks - since I know if the Carb block is a little less in comparison with the Protein block - it won't make me hungry as the oposite seems to be true for me.
Thanks for posting this question and thanks Sue for responding to it!