A common/basic protein intake for a lifter is 1 gram per lb of bodyweight, and depending on your goals, some ppl eat up to 1.5 or 2 grams of protein per lb BW (when they wanna bulk). However, if you're really eating TOO much of it (let's say 3 grams), it'll put in excess pressure to your kidneys (so remember to drink plenty of water!) or simply convert to fat or burn as energy (not 100% sure on this).
So judge on your weight, and eat the protein ratio required. If you're 120 lbs, eat that amount of protein at least.