Updated: The Weight/Body Fat Conundrum

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Body weight doesn’t matter, body fat does. Here’s an analogy. Think back to your middle school earth science class. Remember when you had to weigh different rocks, and it was shocking to find a small rock that was much heavier than it looked? What was your teacher’s explanation? If you don’t recall, here it is: the rock had a tightly-compacted cell structure. In other words, it was dense. Density impacts weight. The more dense something is, the more it weighs. The same is true with muscle versus fat. Muscle is dense and compact. Fat is less dense, but occupies more space.

As you lose body fat, muscle can develop simultaneously. Weight can ultimately stay the same, barely change, or even increase as body fat percentage decreases dramatically.

In a society that places emphasis on the scale, teaching my clients the basic science of density versus mass was a big challenge. It’s simple, really. Your total body weight consists of your blood, bones, muscle, body fat, whatever you just ate — or didn’t eat — waste, and so on. This can, of course, fluctuate — and does frequently. Conversely, your body fat percentage is, well, your body fat percentage. Its number reveals more about the state of your health than the fact that you have blood and bones that weigh something. Body fat percentage also takes time to change, and the handy thing is, it’s a measure of what those scale-obsessed people really want to know: how much of their weight is fat. The image below demonstrates why this is so important.

It comes down to density. Fat is an energy reserve, while muscle is “working” weight. Dense and compact, muscle powers your body through actions. Muscle burns more calories than fat and can keep you lean. The more muscle you have, the more of a fat-burning-machine you are.

Now that you’ve learned the difference between total body weight and body fat percentage, it should really be a no-brainer to be more concerned with body fat percentage than how much your body waste and all that fun stuff weighs at any given time. Still, many people (women especially) obsess over the scale. Please, take the logical route. Get your body fat percentage checked at a local gym for free, or buy a body fat analyzer or calipers, and simply check what you really care about: your body fat percentage.

BONUS: Once you find out your body fat percentage, subtract it from your total body weight. From there, you’ll have your body fat to lean body mass ratio. That information can help you determine more accurate caloric needs than calculations based on ever-fluctuating body weight. The following link has an excellent calorie calculator to get you started: http://www.burnthefatinnercircle.com/members/Katch-McArdle-Calorie-Calculator-For-Men-And-Women.cfm

Article initially published on December 9, 2016 - Updated and republished on May 24, 2018

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