I've actually dropped my protein to around 150g or so a day, and have made much improved gains as a result. After researching it further I'm of the view that alkalysing your diet and hitting 1.2-1.6g of protein per kg of bodymass (lean) is far more beneficial. There are good bell curves of protein synthesis, and the excesses just don't improve or increase protein synthesis, and it either gets changed into urea in your liver and sent to your kidneys to clean, or possibly turn into glucose and used as an energy substrate - it might either be used immediately as fuel or stored (as glycogen). If you already have sufficient carbs to refil your glycogen stores then it'll turn to fat. However in practice this doesn't occur in great extent.
However, you're just wasting money and your time.
Get some good fats in, good low GI carbs (even better carb cycle if you can manage it).
There are some studies however which show that protein can increase you MBR if you're already at a healthy state of fitness, so a portion of protein calories are oxidised and given off as heat (thermogenic reaction) - so minimising the fat storage possibility - however, this is again balanced with the other macros in your diet. This is not a stand alone rule.
It is categoric however that people with live/kidney disease are recommended a low protein diet, and for good reason. So it's just something to think about. Protein is VITAL for bodybuilding and muscle repair, but excess is also just as wasteful and pointless.
I'm just trying to save ya'll money!
However if you're on a "cut" and removing carbs from your diet, then you will need the extra protein to replenish the glycogen in your body. Personally I don't do cuts etc... so I prefer a synergistic approach to my diet, i.e. include carbs and fats.
IT's all a bit of a balancing act really. Overall you're not going to do yourself any harm, but why waste all that money when you don't need it?
/speach over.
I'm not trying to say don't eat protein, however if you get your ratios right and train well, optimal protein synthesis can happily occur within 1.2-1.7g per kg. So of course if you weigh 150kg then you can easily need nearly 300g of protein - but we're talking extremes here.
~I'm not telling you to do anything about it - just sharing my knowledge. Take it or leave it.