But it's also important to talk to your child's doctor to help understand the results. Starting when your child is 2 years old, the doctor will determine BMI at all routine checkups. Over several visits, the doctor is able to track your child's growth pattern.
Although not a perfect measure of body fat, BMI helps identify children who are gaining weight too slowly or too quickly. BMI percentiles show how a child's measurements compare with others the same gender and age. BMI is not a direct measure of body fat.
Teens can have a high BMI if they have a large frame or a lot of muscle, not excess fat. And a person with a small frame may have a normal BMI but still can have too much body fat. Also, it's common for teens to gain weight quickly — and see their BMI go up — during puberty.
Your doctor can help you figure out whether this weight gain is a normal part of development or whether it's something to be concerned about. It's important to look at BMI as a trend instead of focusing on individual numbers.
Storage fat : Fatty tissue protects the internal organs in the chest and abdomen, and the body can use it if necessary for energy. BMI, in contrast, does not distinguish between fat and muscle mass. The most common ways of measuring body fat percentage is to use a skinfold measurement, which uses special calipers to pinch the skin.
The health professional will measure tissue on the thigh, abdomen, chest for men or upper arm for women. The techniques provide an accurate reading within around 3. Other techniques include :.
None of these can give a percent accurate reading, but the estimates are close enough to give a reasonable assessment. In this video by What Matters Nutrition , David Brewer, a registered dietician, takes a look at the question of ideal weight, discussing many of the points raised above. Combining them may be the best way to get an accurate idea of whether you should consider taking action or not. Anyone who is concerned about their weight, waist size, or body composition should speak to a doctor or nutritionist.
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Association between WC and health risks is not an easy task and should be done scientifically using proper techniques. Body mass index - BMI. History BMI is very easy to measure and calculate and is therefore the most commonly used tool to correlate risk of health problems with the weight at population level.
WHO child growth standards. BMI-for-age years.
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