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). 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.
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