The Intelligent & Relentless Pursuit of Muscle™

Protein: More Muscle, Less Guesswork


If you looked at my $14,000-a-year salary as a graduate assistant at the University of Oklahoma, "overpaid" wouldn't be the first word that comes to mind — especially when you consider that 20 percent goes right back to the university for various charges and fees.

But there's one part of my job that I'd gladly do for free, if I had to: As a lecturer on the subject of human nutrition, I get to challenge the prevailing view of protein requirements for people like you and me.

Quick review: The RDA for protein — the "official" number that doctors, nutritionists, and researchers use as the baseline for all policies and recommendations — is 0.38 grams of protein per pound of body weight per day for an average adult.

That, they say, is enough dietary protein to maintain a healthy metabolism and allow for muscle repair and rebuilding in 97.5 percent of the American population. If you're part of the muscular minority — a competitive bodybuilder or strength athlete — the recommendation doubles, to 0.77 grams of protein per pound of body weight per day. [1]

muscles

Not representative of 97.5 percent of the American population

So if you weigh 200 pounds, your range of acceptable protein intake would be somewhere between 76 and 154 grams per day, or between two and four chicken breasts.

Bodybuilders, however, have our own playbook. For most of us trying to add muscle, or hoping to retain it while cutting, the minimum is usually 1 gram of protein per pound per day. At 200 pounds, that's still just 200 grams of protein, or the equivalent of five chicken breasts, which wouldn't strike any serious musclehead as excessive.

Then there's the frequency debate. If you're a mainstream doctor or nutritionist, you're probably invested in the idea of "calories in vs. calories out." In other words, the frequency or timing of your meals doesn't matter. All that matters is how many total calories you eat.

If bodybuilders are wrong and mainstream nutritional science is correct, we can certainly save a lot of time, money, and hassle by eating less high-quality protein, and worrying less about such details as frequency and timing.

So which side is right? Let's look at some data.


How much is enough?

As a scientist with a focus on nutritional interventions, I take serious issue with the way the RDA was calculated. And, if it were up to me, I'd explain to Testosterone readers the benefits and drawbacks of different methods for measuring how the body uses protein. My editor, though, has other ideas.

He says it makes his eyeballs bleed to read phrases like "indicator amino acid oxidation," and I respect that. Still, for the record, I think there's a strong scientific argument against the methods used to calculate RDAs, and a strong argument in favor of a more accurate system.

So I'll spare you the technicalities of that argument. Instead, let's look at what's behind Door #2:

In a fat-loss study conducted recently at our lab at OU, we recruited a group of sedentary but otherwise healthy adults (both genders), and assigned each person to one of three groups.

The first group (shown in the charts below as CON) did nothing except allow us to keep track of their diet. Like typical American adults, they eat more protein than the RDA suggests (about a half-gram per pound of body weight per day, which is 21 percent higher than the RDA), and about three grams of carbohydrate for every gram of protein.

The second group (EX) ate that same diet, but added exercise: two days a week of strength training, three days a week of endurance work.

The third group (EXFS) exercised and also added one or two protein shakes a day. They averaged 0.72 grams of protein per pound of body weight per day. That's about 60 percent more protein than the other two groups. [2]

Results from the Lockwood, et al. (2008) study:

fat mass

The first thing that jumps out: Even with a crappy diet, the first exercise group (EX) lost some fat — about two pounds in the 10-week study. But by adding one or two protein shakes a day (one shake per day for the first two weeks, two shakes for the next eight weeks), the final group lost more than twice as much, dropping about five and a half pounds, on average.

muscle mass

When you put newbies on a five-times-a-week workout program that includes strength and endurance, you expect them to add a bit of muscle while they drop some fat. So it's no big surprise that the first exercise group would gain a bit of muscle (about half a pound) while dropping some fat.

As before, the extra-protein group got twice the benefit, adding a pound of muscle to go with the loss of five pounds of fat. Even for newbies, that's not bad for just 10 weeks!

5RM bench press
5RM Squat

Both exercise groups increased their strength, of course. And, again, the group with extra protein saw slightly bigger gains — which is to be expected, since muscle strength is so closely related to muscle size.

If you're wondering why the non-exercising control group also increased in strength, I should note that it's such a slight gain as to be statistically nonsignificant — it could be a fluke, or it could be that one or two people in the control group got some exercise we didn't know about. Either way, it doesn't matter.

VO2 max

The exercise group getting more protein also improved their endurance more than the non-supplemented exercisers. We weren't surprised by this finding; we figured that the group getting more protein would experience more complete recovery between workouts, so it makes sense that they'd be able to work out harder and see bigger improvements in their aerobic performance.


What you actually need

So what can we take away from this study?

Those numbers, however, are for beginners. For serious lifters and competitive strength athletes, we have to bump up the protein.

The International Society of Sports Nutrition, in a 2007 position statement, concluded that bodybuilders and strength/power athletes require just under a gram of protein per pound per day. [3]

But even the ISSN statement looks at studies based on nitrogen balance, which underestimates how your body actually uses protein by a large amount — 40 to 55 percent. (I'd tell you how I came up with that number, but I can feel my editor staring me down with his bleeding eyeballs.)

More sophisticated estimates of protein requirements suggest that you can break it down in terms of individual essential amino acids ("essential" means your body can't make them from other amino acids in your diet). I've done that in the following chart, adding 40 percent to the totals for regular folks to estimate how much T-Nation readers need to reach their goal of improved body composition:

Normal Adults

T-Nation Adults

Amino Acid

mg/lb/d

mg/kg/d

mg/lb/d

mg/kg/d

Total BCAAs*

65.5

144.0

109.2

240.2

Isoleucine

19.1

42.0

31.8

70.0

Leucine

25.0

55.0

41.7

91.7

Valine

21.4

47.0

35.7

78.5

Lysine

15.9

35.0

26.5

58.3

Methionine

5.7

12.6

9.5

20.9

Phenylalanine

19.1

42.0

31.8

70.0

Threonine

8.6

19.0

14.3

31.5

Tryptophan

1.8

4.0

3.0

6.6

Essential aminos are found in the greatest concentration exactly where you expect to find them: milk, eggs, meat — animal protein sources, in other words. A serving of Metabolic Drive, for example, contains 20 grams of protein, about 9 of which are essential amino acids.

Donald Layman, a nutrition professor at the University of Illinois, offers a simple solution: Eat a minimum of 30 grams of protein for breakfast, and at least 30 grams of protein at every subsequent meal, with meals no more than five or six hours apart. [4]

Researchers at Cal State-East Bay came up with a more complex formula for T-Nation types: Each time you have a protein-containing meal, you should have the equivalent of 23 to 33 grams of protein in that meal. They also concluded that you'll get the biggest anabolic response if you have these meals about every two hours. [5]

The first is probably too casual for muscleheads like us. The second is a bit fanatical, even by our standards. So here's the middle ground: go for six meals a day, each containing at least 25 grams of protein.

That's a general, all-purpose recommendation. Use the following system to tailor your protein consumption to your current needs.


Personalize Your Protein Needs


Current training cycle:

Off-season or moderate

You have no specific goals beyond maintaining your current body composition.

You need 0.8 grams of protein per pound of body weight per day.

Goal weight

Protein grams per pound

Protein grams per day

Protein grams per meal

195

0.8

156

26


Moderate to high intensity

You're pushing yourself to build muscle, gain strength, and/or lose fat.

You need 1 gram of protein per pound of body weight per day.

Goal weight

Protein grams per pound

Protein grams per day

Protein grams per meal

195

1.0

195

32.5


High intensity or pre-competition

You're in serious training, possibly preparing for a bodybuilding contest or some other competition that requires peak performance.

You need 1.36 grams of protein per pound of body weight per day.

Goal weight

Protein grams per pound

Protein grams per day

Protein grams per meal

195

1.36

265

44


Conclusion

While optimal protein needs will continue to be a hot topic for discussion for years to come, it's good to have some research to back up assertions that are in conflict with the recommendations of lay people and lay nutritionists.


References

1. Rand WM et al. Am J Clin Nutr 2003;77:109—27

2. Lockwood et al. Nutr Metab 2008, 5:11

3. Campbell B et al. J Int Soc Sports Nutr 2007, 4:8

4. Layman DK. J Am Coll Nutr 2004, 23(6 Suppl):631S-636S

5. Wilson J and Wilson GJ. J Int Soc Sports Nutr 2006;3(1):7-27

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