BMI Scales: 5 Fast Facts

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Fact #1. You may be wondering how a simple digital scale can figure out your body composition. After all, it seems too good to be true that you can just stand on a flat device and have it reveal the wonders of your inner workings. While these scales aren't perfect, they are capable of doing a pretty good job of calculating your BMI.
Fact #2. Most scales work using something called bioelectrical impedance analysis. This is a process through which your body's ability to oppose the flow of an electrical current is measured. Once this is calculated, the scale can then estimate how much of your body is made of water. This, by extension, can estimate how much body fat you carry. From there, your weight and body fat percentage are compared.
Fact #3. It's worth noting that any home body fat analyzer will be less accurate than a reading taken by your doctor. The most precise tests are done in labs using techniques like hydrostatic weighing, x-rays, or 3D body scans. You're not going to replicate that accuracy at home, no matter how much you spend on a scale.
Fact #4. BMI scales can give you important information, even if it's not the same thing as going to the doctor. Knowing your exact BMI is less valuable to your weight loss efforts than charting its change over time. Regardless of whether the scale is accurate down to the decimal point, it will still be helpful so long as it's consistent.
Fact #5. The quickest way to lower your BMI is to lose weight. Following a healthy diet is still the undefeated weight loss champ. High-protein diets seem to be the fastest method for shedding body mass. However, the best diet plan will always be the one you're capable of following.