My understanding was that if your body doesn't have anything to use the protein on it just goes straight through your system without affecting any body functions. I've also heard that over 100g of protein, no matter what your body weight is, is just a kind of overkill and you body wouldn't use it anyway.
I believe it gets excreted by your kidneys if I'm not mistaken.
However, the threshold of this happening is the key. 300 grams of protein per day is probably too much for most people on this board and many athletes. You
would definitely be excreting protein at that level, and it probably would not be healthy in the long run.
I'm no MD, but I don't think that any male athlete taking in 100 g of protein would be nearing that threshold. I just don't see it happening.
I've done all different amounts of protein, and I personally feel best and perform best around 200 g per day. Sometimes its more like 150, sometimes a bit over 200, but I do best in that range. That probably makes some people on here cringe, but theyre likely not bodybuilders either. The rule and average is 1.0-1.5 g per pound bodyweight per day. My numbers fall into that benchmark.
This brings up another interesting point about body building: it's hard to discern the apocryphal from scientific conclusions. Are you suggesting that based on personal experience xveganjoshx?
I went from 120 lbs to 155 lbs in my first 12-18 months after going vegan and beginning bodybuilding simultaneously. I think I was taking in even more protein than I do now, like 250 per day, but for me now I view that as suboptimal. I hit 30-40 grams protein per meal now and shoot for 5 meals/day.