From Classic X questions
Ellington Darden PhD
How Much Protein?
Dr. Darden, in the last Classic X you mentioned that ingesting 300 grams of protein may be injurious to your kidneys. What about a man of 170 pounds who lifts weights? Is 170 to 200 grams is too much, let alone say from 200 to 220 grams of protein? Just how much protein does a man or woman need to build muscle?
Charlie
You need a lot less than most bodybuilders believe. My research shows that the U.S Department of Agriculture’s recommendation for protein is on target. They recommend 0.8 grams of protein per kilogram of body weight per day. Thus, at 170 pounds, or 77.3 kilograms, you would require 61.84 grams of protein a day (77.3 x .8 = 61.84).
But wait a minute, you must be saying, I want to build muscle. How much more do I need?
To answer this question, you have to go back to the USDA’s original research and determine how they did their calculations. First, they established a minimum need for a reference person who weighed 70 kilograms. Then, they subjected this data to the bell-shaped curve and appropriate plus or minus standard deviations.
The minimum protein requirement for the reference person was 23.8 grams daily. This meant that 50 percent of the population would have their needs satisfied by 23.8 grams or less of protein per day. And 98 percent of the population would have their protein needs met by 30.8 grams of protein a day.
Since most people do not consume ideal compositions of protein foods at each meal, the USDA added another 30 percent increment to the figure. The protein requirement per day rose to 40 grams per day, or 0.57 grams per kilogram of body weight.
And finally, just to sure that there was no question about the rationale, the figure was boosted from 0.57 per kilogram of body weight to 0.8. According to standard deviations, the 0.8 figure was twice as much as 98 percent of the population actually needed. The requirements of athletes and fitness-minded people were also considered in determining the guide number.
So, Charlie, even if you are a high-intensity bodybuilder, it’s highly unlikely that at a body weight of 170 pounds (77.3 kilograms), you would require more than 61.84 grams of protein per day. Remember, the 0.8-gram figure is not the minimum amount, it’s double minimum. Even if you fall at the upper end of the 98-percentile range, all you would have to do is consume a little bit more protein (not massive amounts) — which you probably already do. Nutritional studies reveal that men in the United States average more than 100 grams of protein a day.
Also, you should understand that only 22 percent of muscle is actually protein. Most of muscle is composed of water. It takes only a small amount of extra protein to produce a pound of muscle, particularly since so little muscular growth takes place within a week. Your 61.84 grams of protein a day guideline will be more than enough for you to build several pounds of muscle per week.
I know that for more than 40 years, almost everyone interested in bodybuilding has been brainwashed — primarily by the manufacturers of protein supplements — to believe that people who want to build muscle require massive amounts of protein each day. Even a few scientists somewhat and reluctantly agree. But the vast majority of nutritional research shows that massive amounts of protein are not necessary or desirable to build large muscles.