Complete the following two calculations, rounding to one decimal place. Show me the answer Related Links. Links with this icon indicate that you are leaving the CDC website. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
Here is one that looks at several metrics leg bone size, stability, heat loss, and actual measurements from Singapore and the UK to estimate that the body scales between 2. Here is one that suggests 2. So BMI understates scale as you go up in height because it only squares. But cubing would overstate it.
BMI does not take into account age, gender, bone mass, or muscle mass. Heavily muscled athletes will have a high BMI and a low percentage of body fat.
As others have pointed out though, you have to be very muscular for that to be an issue in using your BMI. Like the fuel gauge in your car. I think a lot of the hate about BMI is just not liking the result.
More to the point, I think there are a lot of people who are approximately average weight and therefore think of themselves as healthy, and then are horrified to be classified as overweight.
But the thing is, the average american is on the hefty side by many measures. About a year ago was the last time I met with my bariatrician MD specializing in weight loss.
At the time I was pounds with about pounds of lean mass and 40 pounds of fat. According to BMI I needed to lose 17 pounds to break into the very top of the healthy weight range.
Keyes was very clear that this was a population level tool and that its utility at an individual level was quite limited. Still it was quick and easy and once people got up into the higher percentiles the correlation with overfat was very high. For men that was a BMI of Short version - the BMI is a very good tool for following similarly composed populations over time.
If an individual has a BMI over 30 the odds are pretty high that they have excess adiposity. Some 25 to 30 will be more over fat and some 25 to 30 will actually have little fat. Screening tools however always sacrifice some specificity for sensitivity: some without excess adiposity will be overidentified. Perfect it aint. ABSI may be better. Now sure, being very overweight with lots of body fat does correlate with heart disease rates.
But BMI does not correlate directly with either. The study of people who are identified as having coronary artery disease defined as defined as already having a history of percutaneous coronary intervention, coronary artery bypass graft, or myocardial infarction? The problem with using a BMI of 30 as the definition of obesity is not that it overcalls some who are not overfat as obese but that it misses too many of the overfat.
If you have a BMI of 30 or higher the odds are very high that you are overfat. If you are less than a BMI of 30 you still may be overfat … or not. The group includes those with more fat and worse fat visceral than many of those categorized as Grade 1 obese and those with a fair amount of muscle mass and not only fairly little fat but in particular extremely little fat that is viscerally located.
You can try it here. Trefethen points out that any calculation that assigns one number to a person will not be perfect. Humans are too complex to be described by a single figure. However, he believes this new calculation gives a closer approximation to the reality of human shape and size.
Consider that a person who does no exercise; is 1. An Olympic athlete who is 1. However, muscle is about 18 percent more dense than fat, so this is clearly not true. Still, Trefethen points out that if muscle is 18 percent denser than fat, a person who exercised enough to convert 10 percent of their fat into muscle would still increase their BMI by just 1.
The BMI would still not represent the increase in fitness. However, some scientists argue that waist-to-height ratio might be more appropriate than BMI alone or BMI with WC, as research has proven it to be a predictor of cardiometabolic health. Researchers have suggested that people keep their waist circumference to less than half their height to maximize health and life expectancy.
A person with fat around the abdomen has a higher risk of heart disease and metabolic disorders, because the fat affects the internal organs such as the liver, heart, and kidneys.
Fat around the hips and thighs may be less risky. Studies have suggested that measuring fat gives a more accurate view of health and health risks, but getting an accurate measurement is not easy. However, researchers still need to do more work before these methods will become as easy as using a BMI calculator. People often assume that someone whose BMI says they are overweight or obese will be unhealthy, while someone with a normal BMI will be healthy.
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