This is very true, and an important piece of information for those people who take protein supplements on a regular basis.Only the liver can metabolize and synthesize proteins and the kidney removes circulating amino acids from the body. The recommended amount of protein for the average person with a sedentary lifestyle is 0.36 grams per poind of weight. This is amounts to about 56 grams per day for the sedentary man and about 46 grams per day for the average sedentary woman. If you work out and want to biuld muscle, a common recommendation is upping the amounf of daily protein to 1 gram per pound of weight. Only endurance athletes are expected to consume significantly more, at 0.65 grams per pound, about double the amount for the average, sedentary person.Studies conflict each other on this subject, but in general they reveal that there is evidence that consuming significantly more protein than this could damage your liver and/or kidneys, and if you already have a liver or kidney health condition, you could induce organ failure when overdosing on protein.