Bmi Percentiles

Posted onOctober 22, 2011 - 1:29 pm by Admin | 0 Comments

Have you ever seen the abbreviation “BMI” and wondered what it meant? BMI stands for “body mass index” and is a measure of body fat based on height and weight. For example, a woman who is 5’3” inches tall and weighs 135 pounds has a BMI of 23.9, while a woman who is 5’3” and weighs 182 has a BMI of 32.2. The woman who weighs 182 pounds has more body fat than the woman who weighs 135 and is actually considered “Obese” by BMI standards.

Scientists have come up with several categories for BMI to try and describe weight:

  • Underweight is defined as having a BMI below 18.5
  • “Normal” is defined as having a BMI of 18.5-24.9
  • Overweight is defined as a BMI of 25.0-29.9
  • Obese is defined as a BMI of 30 or more

If you are an adult (over 18), you can use this link to find your BMI and get information about any potential health risks associated with your body fat and weight.

For children, we calculate BMI, but cannot interpret the numbers as we do for adults. BMI percentiles are used to look at the size and growth patterns of children and teens. Girls and boys have different growth patterns, so gender and age in months is needed to determine what weight category a child is in at a particular time.

As with adult BMI, researchers have created weight categories to describe the different BMI percentiles for children and teens.

  • Underweight is a BMI percentile of less than the 5th percentile
  • Healthy weight is a BMI percentile of 5th to 84th
  • Overweight is a BMI percentile of 85th to 94th
  • Obese is a BMI percentile of  95th and above.

Restrictive diets are seldom prescribed for children, even those who may fall in the obese category. Instead it is healthier for children to stay physically active and focus on eating fruit, vegetables, lean proteins and dairy foods while avoiding sugary drinks and fatty fast foods. You can go to this website and find out your child’s BMI percentile.





In light of the constant stream of fad diets and the increasing concern for obesity, researchers are constantly looking for the best measure of weight loss. Most people judge their weight loss by checking the scale or noting that their clothes fit looser. While these are both good methods, weight loss is not evenly distributed throughout the body. Therefore, if your clothes do not fit more loosely, it is still possible that you may have lost weight. In addition, if you have increased physical activity as part of your weight loss plan, you may have increased muscle, which may cause your clothes to fit tighter or cause the number on your scale to tip higher. An increase in muscle mass is a good sign, because it may indicate that you have lost some fat. As a result, there are numerous ways to help measure weight loss.

BMI

Perhaps the most common indicator of a healthy weight is body mass index (BMI). Most researchers and health professionals use the BMI as a way to determine if your weight is healthy for your age and gender. To calculate BMI, use the following formula:

For children, BMI percentiles are used to indicate the category into which a child falls:
 

  • Underweight (less than 5th percentile)
  • Healthy weight (5th %ile to <85th %ile)
  • Overweight (>85th %-ile to <95th %ile)
  • Obese (>95th %ile)
For adults, your calculated BMI (based on your height and weight) number determines your weight status. BMI is a good method for screening the general population, but can be inaccurate due to its inability to consider the weight of muscle. Therefore, using BMI as an indicator, along with another measurement, may be better at predicting health problems - such as heart disease - associated with weight status.

Waist Circumference

One of those better options is waist circumference. This inexpensive and easy method for measuring body fatness helps to determine if your weight status affects your health. According to the National Heart Lung and Blood Institute (NHLBI), waist circumference is associated with determining your risk for diabetes, high blood pressure, and cardiovascular diseases because fat found around the waist has been linked to increased health problems. To determine your waist circumference, wrap a tape measure around your waist sitting at the top of your hip bones. (If the hip bone is difficult to find, use your belly button as a guide.)

Make sure the tape measure is not tight around the waist, but is snug and that you are fully relaxed and breathe out. Women with a waist circumference greater than 35 inches or men with a measurement greater than 40 inches have increased health risks, such as diabetes and heart disease.

Changes in waist circumference measurements, along with BMI, are good indicators of whether or not you have an increase in fatness, even if your BMI stayed the same. Waist circumference is more useful to those who have a BMI considered in the normal and overweight category (BMI between 18.5 - 34.9). If BMI is greater than 35 (obese), the waist circumference has not shown to be any more useful in predicting other health risks.

Waist-to-Hip Ratio

Another form of measurement is the waist-to-hip ratio, which is calculated by dividing your waist circumference by your hip circumference. Essentially, this is a calculation of the smallest section of your waist (around the belly button) and the largest section of your hip (around the buttocks).

According to the CDC and the National Institute of Diabetes, Digestive and Kidney Diseases (NIDDK), women with a waist-to-hip ratio of less than 0.8 and men with a ratio of less than .9 are considered healthy. Anything above that could correlate health risks, such as diabetes and cancer. Yet, research is conflicting for use of the waist-to-hip ratio where some studies have shown that the ratio is not a good predictor of health problems.

If you are looking for more specifics and percentages of your body fatness, speak to your doctor about other possible measurements that require equipment such as: the dual energy x-ray absorptiometry (DEXA) which is frequently used to test bone density; bioelectrical impedance (BIA) or body fat meters. which use an electric current to measure resistance and determine body fat percentage; or skinfold thickness measurement using calipers that pinch the skin to determine the fat layer underneath the skin. In summary, to determine your weight status in a quick and inexpensive way, use a combination of your BMI, waist circumference, and waist-to-hip ratio. While each of these methods have some pros and cons, they still provide some insight into your weight and health status.

For a long time, physicians have used weight and height measurements to value a kid’s physical growth in reference to other children the same age. Now they’ve different tool. This is . Body Mass Index is a calculation that uses weight and height to estimate how much body fat individual has. Physicians use it to check how harmonious a kid’s weight is for a certain height and age.

You can choose any of the body mass charts on this page to determine your kid’s BMI. Merely it’s also significant to have your physician perform regular BMI measurements. As a result, you will know the number is exact and the physician can discuss the outcomes with you. Beginning when your kid is 2 yrs old, the physician will determine BMI index at regular checkups and plot this measurement on a body mass chart against those of other children the equal age.

Since what is natural alterations with age, medicos must plot kids BMI measurements on standard growth graphs rather than using a general normal grade for body mass chart as is done with adults. They besides use separate BMI charts for girls and boys to account for deviations in amounts of body fat and rates of growth as the 2 genders mature. That information is registered in your kid’s medical history, and over numerous visits the pattern of measurements allows the physician to track your kid’s growth.

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Body mass chart is especially helpful for identifying teenagers and children who are at risk for becoming importantly overweight as they get older. In older teens and children, there’s a strong correlation ‘tween the amount of body fat and weight chart. Therefore those with high BMI chart and, believably, high grades of fat are most potential to have weight troubles when they’re older. By identifying these at-risk children, physicians can check their body fat carefully and try to forestall adult obesity through alterations in feeding and exercise habits.

BMI percentiles indicate how children’ measurements compare with others the same age and gender. For instance, if a kid has a BMI in the 55th percentile, 55% of the children of the same age and gender who were measured had a lower Body Mass Index.

Body mass chart isn’t ideal. For instance, it’s very common for children to gain weight rapidly – and see the weight chart go up – during puberty. Your physician can help you figure out whether this weight gain is a natural part of growing or whether it’s something to be concerned about. Children can also have a high BMI index if they’ve a large frame or more muscle, not superfluous fat. And a child with a little frame may have a normal BMI chart but too much body fat.

Though weight chart isn’t a absolute or ideal measure of body fat, children at or above the 95th percentile are regarded obese, a term physicians use to show superfluous body fat, which increases the danger of weight-related unhealthinesses. Children who measure at the 85th to 94th percentiles are regarded overweight, because of superfluous body fat or high lean body mass. A kid whose BMI index is ‘tween the 5th percentile to 85th percentile is in the healthy weight grade. A kid with a Body Mass Index below the 5th percentile is regarded underweight.

Besides, it’s significant to consider the BMI chart numbers as a trend instead of concentrating on individual numbers. Some one measurement, taken out of context, can give you the incorrect impression of your kid’s growth. The real rate of BMI measurements consists pattern over time. That allows both physician and parents to watch a kid’s growth and check whether it’s normal compared with that of other children the same age.

Although body mass chart is an significant indicator of development and healthy growth, if you think your kid may be gaining or losing weight too quick, speak to your physician.

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