Weight and Body Fat
How does it work?
While body fat can be measured in many ways, the method used in your scale
is bioelectrical impedance. This indirect method of determining body fat starts when
a safe and very low electrical current is sent through the lower half of the body.
The electrical current flows more quickly through water and muscle than it will
t h rough bone and fat. The scale measures the speed of the current. Based on this
n u m b e r, the scale estimates body fat using a multi-step, mathematical formula.
Is it accurate?
M e a s u rements of body fat tend to fluctuate a lot more than simple weighing,
and diff e rent methods of estimating body fat yield very diff e rent results. Just as
d i ff e rent scales give diff e rent results, diff e rent body fat analyzers can provide very
d i ff e rent body fat estimates. Even with the same scale the numbers will vary because:
• Weight loss tends to produce substantial, continuous, and unpredictable changes
in body water content. Because body fat analysis is determined by water content
in the body, results can vary considerably from day to day.
• Hydration status affects body fat results. If you’ve just worked out, there is less
water for the electrical current to flow through. This may result in a higher body
fat result. In the same way, if you measure your body fat after drinking a lot of
fluid, it may appear that body fat is lower than it really is.
• Skin temperature can have an influence also. Measuring body fat in warm humid
weather when skin is moist will yield a diff e rent result than if skin is cold and dry.
• As with weight, when your goal is to change body composition it is better to track
t rends over time than to use individual daily re s u l t s .
• Results may not be accurate for persons under the age of 16, or persons with
an elevated body temperature, diabetes or other health conditions.
What you need to know!
• P e rcent body fat refers to the number of pounds of fat divided by your total body
weight and multiplied by 100.
• During weight loss, percent body fat doesn’t appear to be reduced as quickly
as expected because total weight loss and total body fat are decreasing at the
same time (for a more detailed explanation, see next section).
• Weight loss in the form of body fat and lean tissue (muscle) is common, and is norm a l .
• To minimize the loss of lean tissue, include regular physical activity, especially
s t rength training, in your weight-loss plan.
Why do I lose weight but my body fat percentage doesn’t change much?
Most body fat monitors show body fat as a percentage only. This body fat
monitor shows you not only a percentage but the actual number of body fat
pounds (in fact, this is the measurement you see after your weight is displayed).
Why is that important? When you lose weight, both the numerator (pounds of body
fat) and denominator (total body weight) go down, so when it’s calculated as a body
fat percentage, the number can be small. For example, a person may weigh 200
pounds and have 40% body fat (= 80 pounds of body fat). He/She loses 20 pounds,
but the body fat has only dropped 4% to 36%. That 4% of body fat was 16 pounds
of fat – a very significant amount! So do not be overly concerned if you do not see
the percentage change quickly as you are losing weight: monitor the absolute
number of body fat pounds lost. Remember, to minimize the loss of lean tissue,
include regular physical activity, especially strength training, in your weight-loss plan.
About BMI
BMI stands for Body Mass Index, a statistical term derived from height and weight.
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