“I use body fat scales to get some sort of objective measure of my body composition,” wrote one Muscle Evo reader. “It’s been measured at 10%.”
“I’m stuck on where my focus should be. I’m sort of anticipating you would advise me to focus on muscle gain given that my body fat is below 10%.
“But when I look down at my stomach, it definitely doesn’t feel like I have less than 10% body fat.
“I feel like I probably have a reasonable set of abs underneath but they’re not visible because of the surplus fat. So I keep pendulating between fat loss and muscle gaining both in my workout programs and my nutrition, going round in circles achieving not a great deal for a lot of effort.”
What do you do when the results from a body fat test leave you confused about what your goal should be?
I’ll get to that in a moment.
First, imagine you’re sat at home.
The phone rings.
You answer it.
It’s your best friend.
He doesn’t have a sat nav or a map.
And he needs your help to get himself “unlost” again.
After telling him what an idiot he’s been for setting off without a sat nav or a map, what’s the first thing you ask him?
It’s probably going to be something along the lines of, “do you know where you are right now?”
That’s because knowing where you are right now is a necessary first step in order to get where you want to go.
All of which brings me to the main problem with body fat scales – they’re highly unreliable when it comes to telling you where you are right now in terms of body composition. It’s a subject I’ve covered in more detail here.
The problem isn’t one that’s limited to body fat scales.
A body fat test is less of a measurement than it is a prediction. And just like the words of wisdom that come from economists, football pundits and stock market analysts, many of those predictions will turn out to be wrong.
“Regardless of how the measurement is done, we end up with a prediction of what we think your body fat would be if we were to kill you, take all of the fat, and weigh it, “writes James Krieger in The Pitfalls of Body Fat Measurement.
“This prediction has an error associated with it, and the size of this error varies depending upon which technique we used to take the measurement. While some techniques have smaller errors than others, even the best techniques have pretty large errors… larger than what most people realize.”
The BodPod… DEXA… underwater weighing… none do a very good job of tracking individual changes over time (as opposed to measuring group averages) when compared to the 4-compartment model, which is currently the “gold standard” where body fat testing is concerned [1, 2, 3].
If you really want some kind of “objective” way to measure how much fat you’re losing over time, I’d suggest using skinfold calipers in the way I’ve described here.
In short, a body fat test is a guess about how much fat you have.
It’s a guess that looks very scientific and official because it comes dressed up in “state of the art” equipment and complicated equations.
But it’s still a guess.
So here’s the simple way to decide what your goal should be.
Take a look in the mirror.
If you see more fat than you’d like, then focus on getting rid of it.
Once that’s done, then you can focus on something else.
SEE ALSO: THE MUSCLE BUILDING CHEAT SHEET
If you're fed up spending hours in the gym with nothing to show for it, then check out The Muscle Building Cheat Sheet.
It's a "cut the waffle and just tell me what to do” PDF that tells you exactly how to go about building muscle. To get a copy of the cheat sheet sent to you, please click or tap here to enter your email address.
ABOUT THE AUTHORChristian Finn is the nation’s leading authority on science-based, joint-friendly ways to build muscle. A former "trainer to the trainers," he holds a masters degree in exercise science, and has been featured in or contributed to major media on two continents, including the BBC and Sunday Times in the U.K. and Men’s Health and Men’s Fitness in the U.S.
1. van Marken Lichtenbelt WD, Hartgens F, Vollaard NB, Ebbing S, Kuipers H. (2004). Body composition changes in bodybuilders: a method comparison. Medicine and Science in Sports and Exercise, 3, 490-497
2. Mahon AK, Flynn MG, Iglay HB, Stewart LK, Johnson CA, McFarlin BK, Campbell WW. (2007). Measurement of body composition changes with weight loss in postmenopausal women: comparison of methods. Journal of Nutrition, Health and Aging, 11, 203-213
3. Santos DA, Silva AM, Matias CN, Fields DA, Heymsfield SB, Sardinha LB. (2010). Accuracy of DXA in estimating body composition changes in elite athletes using a four compartment model as the reference method. Nutrition and Metabolism, 7, 22