I can't quite remember where I read this, but there was an article on how much protein is too much. In the article, there was a point put forward that went basically like this:
If you eat 400g protein per day for a few weeks, but only need 200g, your body will start to use protein for energy, since the excess is not usable for other purposes. If you now stop eating that much protein and eat 200g per day instead, your body will still use some of it for energy instead of building/repairing muscle.
So my question would be, if that is true. Can a short/mid term protein surplus mess with long term protein synthesis? If so, how much can it be messed up, what can I do against that once it happened and how long will it take to even out again?