Obesity now qualifies as a chronic disease that is increasing in prevalence around the world. The age-adjusted prevalence of class III obesity (BMI greater than or equal to 40 kg/m^2) has risen from 5.7 percent to 7.7 percent between 20. In 2016, the incidence of obesity in American men rose to 37.9 percent, and the prevalence of obesity in American women increased to 41.1 percent. The data collected for NHANES from 1988 to 1994, 1999 to 2000, and 2015 to 2016, demonstrates the age-adjusted prevalence of obesity in the United States has been increasing progressively: from 22.9 to 30.5 to 39.6 percent. No change in height was seen over time except for a decrease in crude estimates among all women. Since 1991 in addition to BMI, mean weight and waist circumference increased for all age groups. The average BMI for American women over age 20 for the year 2015-2016 is now 29.6. The average BMI for American men over age 20 for the year 2015-2016 is now 29.1. BMI in American adults has increased over the past 18 years. It shows that there was an increase of over 8 pounds (3.6 kg) in American men and 7 pounds (3.2 kg) in American women over this period. A new current report from the Center for Disease Control provides updated data on trends in BMI, height, weight, and waist circumference, from 1999-2000 through 2015–2016. National Health and Nutrition Examination Survey (NHANES) of 2007 indicated that 63% of Americans are now in the overweight category and 26% are in the obese category. The main issue of concern in regards to BMI involves the growing obesity epidemic and the increasing population with high BMI numbers. For children, a BMI that is less than the fifth percentile is underweight and above the 95th percentile is considered obese. Moreover, in the pediatric population, BMI allows comparison between children of the same sex and age. In certain populations, like elite athletes and body-builders, an elevated BMI does not directly correlate to their health status due to their increased muscle mass and weight falsely increasing their BMI. However, individual variations do exist, and BMI is insufficient as the sole means of classifying a person as obese or malnourished. The BMI number and classifications are listed below. The cutoffs underestimate the obesity risk in the Asian and South Asian populations, so their classification has slight alterations. These classifications for BMI are in use by the NIH and the World Health Organization (WHO) for White, Hispanic, and Black individuals. The National Institute of Health (NIH) now uses BMI to define a person as underweight, normal weight, overweight, or obese instead of traditional height vs. The number generated from this equation is then the individual's BMI number. It is calculated by taking a person's weight, in kilograms, divided by their height, in meters squared, or BMI = weight (in kg)/ height^2 (in m^2). In the United States, average BMI goes from around 27 in the 18-24 age range up to 30 for all ages 35-74.Body mass index or BMI is a statistical index using a person's weight and height to provide an estimate of body fat in males and females of any age. However, comparing adult BMIs is an interesting exercise. Consult a professional if you have any concerns about BMI.Īs I've noted in this post, you can't directly compare BMI between children and adults who are still growing versus adults who have stopped. Here are the BMI statistics for adult age ranges in the United States: Age Rangeĭisclaimer: nothing on this site is medical advice! BMI is best used contextually, and BMI readings for still-growing youth mean something different than for adults at terminal height. Here are summary BMI statistics for children under age 18 in the United States: Age RangeīMI Distribution by Age for Adults in the United States While relative BMI is important, the CDC evaluates BMIs for children (and even young adults) with growth potential differently. Note that BMI for children shouldn't be compared directly to adult BMIs. BMI Statistics for Children in the United States, by Age Range The United States adult BMI median was 28.2. In 2016, the United States adult BMI average was 29.3. Median and Average BMI by Age in the United States Heights and weights measured at a mobile examination center. BMI Percentile by Age Calculator for the United Statesĭata comes from 5,662 adults with valid BMIs in the CDC's 2015-16 NHANES survey. Use our BMI Calculator to compute Body Mass Index. Select multiple age ranges to see how BMI distribution changes for citizens of different ages in the United States.īMI, or Body Mass Index, is based on height and weight and estimates whether a person is in a healthy body composition range. Enter an age range and a BMI to rank it in the BMI distribution by age. On this page is a BMI percentile by age calculator for ages 2 years old and older in the United States.
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