Question: Why BMI is a bad indicator?

Why is BMI a bad health indicator?

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.

Why is BMI sometimes not a good indicator of health for adults?

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.

How can BMI be misleading?

The BMI also doesn’t measure body composition

For example, muscle weighs more than fat, so athletes or someone who is more muscular could be deemed “overweight” by their BMI even though they may be metabolically healthier than someone whose BMI is in the “normal” range with who has less muscle.

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Is BMI a good indicator of weight?

BMI is a quick, easy, and cheap way of diagnosing overweight or obesity needing only a weight and height measurement. Since obesity carries an increased risk of disease, including heart disease, stroke, and diabetes, BMI can identify those at greater risk of developing health problems.

Why do doctors still use BMI?

Body mass index, or BMI, has been used for over 100 years to help health professionals decide whether a patient is overweight or underweight. It is used in population studies, by doctors, personal trainers, and others.

How accurate is BMI if you are muscular?

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.

Is WHR a better indicator than BMI?

WHR is an easy, inexpensive, and accurate way to see how much body fat you have. It can also help predict your risk for heart disease and diabetes. A few studies suggest that WHR is even more accurate than BMI for predicting the risks of cardiovascular disease and premature death .

What is a better indicator than BMI?

Waist-to-height ratio (WHtR)

WHtR is more accurate than BMI because it takes central fat into consideration. Central fat is important because it collects around the organs in your midsection and has been closely linked to conditions such as heart disease.

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How relevant is body size as an indicator of health?

Women who have a waist circumference of more than 35 inches have a higher risk for heart disease and type 2 diabetes, according to the U.S. National Heart, Lung, and Blood Institute (NHLBI). For men, a waist circumference greater than 40 inches indicates an increased risk of health problems, the NHLBI says.

What is a bad BMI score?

Body Mass Index (BMI)

Underweight Below 18.5
Normal 18.5–24.9
Overweight 25.0–29.9
Obesity 30.0 and Above

Is BMI a load of rubbish?

Weight includes fat, but it also includes bones, muscle, fluids and everything else in the body. … But among those who are overweight or normal weight by BMI, the measurement tool fails, he said. “When we have a measurement that doesn’t really differentiate those who have excess fat, it’s useless.”

Is BMI 35 bad?

Body Mass Index

These ranges of BMI are used to describe levels of risk: Overweight (not obese), if BMI is 25.0 to 29.9. Class 1 (low-risk) obesity, if BMI is 30.0 to 34.9. Class 2 (moderate-risk) obesity, if BMI is 35.0 to 39.9.

Does BMI actually mean anything?

As a single measure, BMI is clearly not a perfect measure of health. But it’s still a useful starting point for important conditions that become more likely when a person is overweight or obese.

What is my ideal weight?

Weight and height guide chart

Height Weight
4ft 10″ (58″) 91 to 115 lbs. 119 to 138 lbs.
4ft 11″ (59″) 94 to 119 lbs. 124 to 143 lbs.
5ft (60″) 97 to 123 lbs. 128 to 148 lbs.
5ft 1″ (61″) 100 to 127 lbs. 132 to 153 lbs.
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Should I pay attention to BMI?

Your BMI estimates your body fat better than the number on a scale. But a tape measure is an equally important tool. As your BMI rises above 25, so does your risk for developing high blood pressure, diabetes, and cardiovascular disease.

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