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How Much Protein Do We Really Need? Part Two (Calculating Lean Body Mass)

Yesterday I talked about how much protein we really need and why I feel eating 1 gram per pound of lean body weight appears to be the best starting place. I wanted to expand on that today with a little how-to:
How to Calculate Your Lean Body Mass

Figuring out your lean body mass and body fat percentage is something that should be simple but rarely is. There are a few ways to do this, but many of them are unreliable. I’ve had online body fat calculators tell me I have anywhere from 16% to 36% body fat. I know I’m really somewhere in between, so you really have to take some of these numbers with a grain of salt.

This is the free body fat percentage calculator I use. It’s been the most accurate one I’ve found online. It takes into account waist and neck measurement (plus hip measurement for women), in addition to height and weight. It also does the lean body mass calculation for you, which is convenient. Hopefully you’ll find this accurate, too, but people with different body types may have varying results. If you use this calculator, let me know how it works for you.

Tanita scales like this one boast a very high accuracy in measuring body fat. Many users report these scales are accurate within 1-2%, which is pretty impressive. However you (understandably) may not be interested in plunking $50-100 down for a scale. Neither am I at the moment.

Omron HBF-306C Fat Loss Monitor, BlackYou can also use calipers to gauge your body fat, have a water displacement test done, or head to your local gym which may have a variety of body fat calculating tools available for you. However, you don’t always get what you pay for, so don’t assume methods like water displacement are more accurate just because they’re more expensive. In fact, some have reported wildly inaccurate results even with this method, which is often considered the gold standard of body fat measurement.

Once you know (or think you know) your body fat percentage, all you have to do is a simple calculation to figure out lean body mass:

[100 – Body Fat Percentage] x 0.01 x  body weight = lean body mass

So, for me, this would be:

[100 – 28 = 72] x 0.01 x 143 = 102.96 lbs of lean body mass

So using this method, I need roughly 100 grams of protein every day. My actual intake right now tends to fall between 80-100 grams, which feels right and isn’t too much of a stretch for me.

Some Parting Words on Protein

While protein is important and we all need some, don’t take these numbers so seriously that they rule your life. I recently ran across a forum post where someone was freaking out (seriously) that they’d been eating 15 grams of protein less than they figured they needed each day. They were petrified that they’d lost significant amounts of lean body mass during the previous weeks! (Which, aside from being ridiculous is also downright impossible.)

The body isn’t that rigid in its requirements, trust me. Like I mentioned in my Counting Calories is Pointless post, to even assume we can figure out with accuracy exactly what our body requires is pretty off base. Numbers can be useful, but they aren’t the end all be all. Learn what works for your body and your lifestyle. Pay attention to your biofeedback and use a little common sense. Think of the numbers we’ve talked about in the last two posts as a starting place that you can tailor to fit with what works best for your body.

Remember: As important as it is to eat enough protein, it’s even more important to choose the right protein. High quality dairy, eggs, legumes, seafood and meat are among the top sources. Avoid soy like the plague: it’s an anti-food.

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3 Responses to How Much Protein Do We Really Need? Part Two (Calculating Lean Body Mass)

  1. I have followed many “real food” blogs but I am always so grateful to you for writing yours! It truly stands out in the crowd and provides me with great information. I was curious, since I was looking to start a Schwarzbein style plan for health/weight loss – have you found that your metabolism has healed? Have you been able to loose weight as a result or are you still in a restoring stage? I was hoping to hear from someone who has been attempting this for awhile to find out if it is all worth it. :) What positives have you gained from it?

    Thanks again for all the research you do in the field of nutrition. It is an inspiration!

    • Thanks for your kind words! :)

      Yes! I’ve experienced a lot of healing from following Schwarzbein’s advice. My metabolism is in great shape now, and I am finally able to lose weight, though that’s something I’m still currently working on with success (finally!). I also sleep much better than I used to and am much more emotionally stable. My husband occasionally makes comments about how much better I handle things than I used to. Little things don’t stress me out as much, and I’m able to bounce back quickly from stress.

      A couple things I changed from Schwarzbein’s advice is that almost all the fat I eat is saturated, whether I’m eating a little or a lot. I also eat more carbs than she recommends because I just feel better that way. But overall I think her books are a great learning tool and put the right emphasis on a holistic approach rather than just looking at diet.

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