This is very true, and an important piece of information for those people who take protein supplements on a regular basis.
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.