Quick Answer: Why is BMI not an accurate measure of obesity?

A glob of muscle weighs about 18 percent more than the same size glob of fat. So, according to the BMI, the sprinter is more overweight than the sedentary person. But as I said earlier, a glob of muscle weighs about 18 percent more than the same size glob of fat, so this is clearly not an accurate statement.

Why BMI is inaccurate and misleading?

BMI (body mass index), which is based on the height and weight of a person, is an inaccurate measure of body fat content and does not take into account muscle mass, bone density, overall body composition, and racial and sex differences, say researchers from the Perelman School of Medicine, University of Pennsylvania.

Is BMI an accurate measure of obesity?

Estimations of body fat beyond BMI include measurements with calipers and waist-to-hip ratio measurements. However inaccurate, BMI is the most convenient way to classify body fat mass and obesity. There are, on the other hand, better methods to measure whole body fat levels.

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Why BMI is not a good measure of health?

BMI is a simple indicator of weight for height and can’t differentiate between muscle mass and fat mass. So BMI tends to overestimate the health risk for adults with a high muscle mass, such as some athletes, and underestimate the risk for adults with a low muscle mass, as can occur with sedentary lifestyles.

Why is my BMI so high but not fat?

Muscle mass can make you heavier and increase your BMI.

Because muscles are more dense and heavier than fat, bodybuilders and other professional athletes like football players are often considered obese or overweight based on their BMI alone. If you have high muscle composition, you’re probably not overweight or obese.

Who should not use BMI?

A person is considered underweight if the BMI is less than 18.5. As with most measures of health, BMI is not a perfect test. For example, results can be thrown off by pregnancy or high muscle mass, and it may not be a good measure of health for children or the elderly.

Why do doctors still use BMI?

Body Mass Index Is a Good Gauge of Body Fat

The most basic definition of overweight and obesity is having too much body fat-so much so that it “presents a risk to health.” (1) A reliable way to determine whether a person has too much body fat is to calculate the ratio of their weight to their height squared.

What is the best measure of obesity?

Measuring Obesity

  • The most basic method, and the most common, is the body mass index (BMI). …
  • The BMI and other so-called “field methods”-among them, waist circumference, waist-to-hip ratio, skinfold thicknesses, and bioelectrical impedance-are useful in clinics and community settings, as well as in large research studies.
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Why is BMI used as a measure of obesity?

Body mass index (BMI) is a measure of weight adjusted for height, calculated as weight in kilograms divided by the square of height in meters (kg/m2). Although BMI is often considered an indicator of body fatness, it is a surrogate measure of body fat because it measures excess weight rather than excess fat.

What is more accurate than BMI?

Waist-to-height ratio more accurate than BMI in identifying obesity, new study shows. Summary: Calculating a person’s waist-to-height ratio is the most accurate and efficient way of identifying whether or not they are at risk of obesity in clinical practice, a new study shows.

What is a good BMI reading?

For most adults, an ideal BMI is in the 18.5 to 24.9 range. For children and young people aged 2 to 18, the BMI calculation takes into account age and gender as well as height and weight. If your BMI is: below 18.5 – you’re in the underweight range.

What is importance of BMI?

Your BMI is a measurement that is a ratio of your weight and height. It’s a good way to gauge whether your weight is in healthy proportion to your height. In fact, knowing your BMI can help you – and your GP – determine any health risks you may face if it’s outside of the healthy range.

Is BMI a good health indicator?

BMI is a useful indicator of health at the population level. However, the distribution of fat on your body is more important that the amount, when assessing your disease risk. For this reason, your waist circumference is thought to be a better predictor of health risk than your BMI.

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Is a BMI of 26 OK?

Someone with a BMI of 26 to 27 is about 20 percent overweight, which is generally believed to carry moderate health risks. A BMI of 30 and higher is considered obese. The higher the BMI, the greater the risk of developing additional health problems. A healthy weight is considered to be a BMI of 24 or less.

Is a BMI of 31 bad?

Thus, a body mass of less than 18.5 is considered underweight; 18.5 to 24.9 is considered a healthy weight; 25 to 29.9 is overweight; 30 to 39.9 is obese; and 40 or more is morbidly obese.

What’s a skinny fat person?

Advertisement. The term ‘skinny fat’ describes a person who maintains a low body mass index (BMI) but who has high levels of body fat and low muscle mass – even though they appear slim in clothing.

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