As hard as it may be for some of you to believe, the findings were clear: “So far as we can determine, peanut butter has no effect on the rotation of the earth [sic].”
It's a shame though, isn't it? It would certainly make eating a PB&J sandwich way cooler! Science: Answering the questions you never thought to ask.
If you're curious about the physicists involved, you can find a list of them here.