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What Is BMI? | Ask The Fitness Nerd

What is BMI and is it an Accurate Measure of Weight and Health?

Dear Fitness Nerd,

Can you explain exactly what BMI is? I recently bought a Wii Fit and according to the BMI calculation I’m fat! I checked some other BMI calculators online and am getting similar results. But I’ve never really considered myself overweight. I exercise daily and think I look pretty toned, but according to the BMI charts I’m overweight! Should I be worried? — Erika (Atlanta, GA)

Ericka, the Body Mass Index, or BMI is one of those things that I wish would just go away, since it causes all kinds of anxiety for people who may actually be in very good shape. It also makes people who may actually have high body fat levels focus on the wrong thing: losing scale weight, when they should be focusing on reducing body fat and encouraging muscle building.

While BMI can be a tool for gauging a person’s body composition in relation to height and weight, it tells you nothing about a person’s percentage of body fat. So for people who have low body fat levels with substantial amounts of lean tissue (muscle), it can be very misleading. 

But before we get into this in greater detail, let’s take a look at what BMI is.

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Will I Get Bulky Muscles from Judo? | Ask The Fitness Nerd

Judo will not make you look fat. Exercise doesn’t necessarily equate to bulky muscles for women. The Fitness Nerd explains why.

Hi Fitness Nerd,

I started taking judo a couple of months ago because I really enjoy doing it rather than using it as a way to keep fit. While I don’t mind gaining a bit of muscle tone, I’m worried about bulking up as I’m a very small female who is a good weight and thick chunky muscles would just make me look fat. Is there anyway I can encourage my muscles to remain small but defined rather than grow big through diet? - Sophie

Sophie, you can relax. The chances of you “bulking up” and looking like a female version of Arnold Schwarzenegger are pretty slim. In fact, I’d say they are close to zero. There are three main reasons for this:

1. Women Don’t Have The Hormones for Huge Muscles

First, most women don’t have the hormonal environment necessary to put on massive amounts of muscle.  Adding muscle requires testosterone — and while women do have some testosterone — they typically don’t have enough to build the freaky muscles that you see on most bodybuilders — male or female. Yes, there are exceptions (and typically they involve the use of anabolic steroids or unusual male hormone levels in women ), but these are quite rare. So unless you have an atypical endocrine system for your gender or are on the testosterone patch, I wouldn’t sweat it for one minute.

2. Body Weight Training Doesn’t Maximize Muscle Mass

Second, judo is an activity that doesn’t involve the introduction of non-body-weight resistance. Building muscle requires consistently overloading the muscles with a progressive amount of weight during weight and resistance training.  This process of overloading the muscles is what builds muscle mass. With judo, you are basically training yourself against your own weight (or against someone else’s in some cases)– which more or less is fairly consistent. While this can certainly build strength, balance and co-ordination (and some muscle mass), it’s typically not enough to add lots of muscle. But again, even if you were pumping iron heavy daily, you’d probably be pretty pleased with the results. So maybe you should try it.

What it will do, is challenge a lot of stabilizer muscles that you might not normally use in your everyday activities, as well as burn some extra calories, which can help you strip off body fat. When people experience a “firming” of their muscles, it’s usually do primarily to a loss in body fat. You can have muscle, but if it’s wrapped in fat, it will seem soft and “jiggly.” Lose the fat, and suddely that lean, gorgeous muscle underneath starts to shine.

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Am I Fat? | Why Body Fat Percentage Is More Important Than Weight

Here’s a Little Secret: The scale lies. Learn why you should focus on decreasing your body fat percentage, instead of just your weight.

Stepping on the bathroom scale is a daily ritual for many dieters, athletes and fitness enthusiasts. After all  being healthy and in-shape means weighing less, right?

Scales seem to be everywhere: The home bathroom, the gym or health club locker room, and – of course — the doctor’s office.  We’re a society increasingly obsessed with our weight, but ironically, one that is becoming fatter than ever.

But what if you knew that your trusty scale was deceiving you? What if you found out that losing a pound or two (or even five) doesn’t mean you’ll look any thinner or more in-shape? What if I told you that losing weight is actually making you fatter?

Why Weight Loss Should Never Be Your Goal

Our preoccupation with moving that pointer on the bathroom scale down closer to zero is at the root of most people’s frustration with becoming healthier and more fit.  Crash diets, fad diets, endless hours of cardio, extreme calorie restriction and eating disorders can be traced directly to our desire to step on the scale and see that we’ve lost weight.

Yet the number that you see on the scale each morning is a terrible indicator of body composition.  Weight alone can’t tell you anything about the distribution of that weight. It doesn’t take into account the ratio of fat to lean tissue, which can cause very lean people to think they are fatter than they really are, and fat people to think they are leaner.  

In other words, losing weight can actually be a bad thing, especially if you are doing it at the expense of lean tissue like muscle.  If all you are using to gauge your fitness progress is scale weight alone, you are only getting half-the-picture.
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