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 accurate if you are muscular?
Crucially, BMI doesn’t distinguish between fat and muscle and studies have found it unreliable.
Is it OK to be overweight with muscle?
BMI isn’t perfect
It often identifies fit, muscular people as being overweight or obese. That’s because muscle is more dense than fat, and so weighs more. But muscle tissue burns blood sugar, a good thing, while fat tissue converts blood sugar into fat and stores it, a not-so-good thing.
What percentage of your body mass is muscle?
According to Withings, normal ranges for muscle mass are: Ages 20-39: 75-89 percent for men, 63-75.5 percent for women. Ages 40-59: 73-86 percent for men, 62-73.5 percent for women.
Is BMI higher for athletes?
And highly trained athletes are at a greater disadvantage: their excess muscle typically puts them at a higher BMI, so they may actually be considered obese.
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 are the disadvantages of BMI?
BMI Doesn’t Account For Body Composition
The first — and biggest — disadvantage of BMI is that it doesn’t account for body composition. This means that if you’re very lean or muscular, your BMI results may not provide an accurate picture of your general health.
What is skinny fat?
What is “skinny fat”? … “Skinny fat” is metabolically obese normal weight, meaning that someone has a seemingly healthy look on the outside but they have risks for a number of health problems that are related to obesity. This is mainly due to a poor diet and lack of exercise. This body type can be seen in men and women.
Why do I weigh more than I look?
1. You have gained muscle mass. … Since dense muscle tissue takes up less space than fat, it’s possible you may weigh the same (or even more) yet appear slimmer than another person with the same weight, a similar height and frame because of the difference in your body composition.”
What is the ideal BMI for athletes?
The American Exercise Council on Exercise recommends a BMI at or above 18.5 and body fat of 14 percent for women and six percent for men. The best athletes in sprint events tend to have a larger mean mass and height than long-distance runners.
How do I calculate muscle mass?
The most accurate way to calculate muscle mass percentage is to use magnetic resonance imaging (MRI). An MRI uses strong magnets to take an image of your muscles.
What should my body fat percentage be for my age?
20-40 yrs old: Underfat: under 21 percent, Healthy: 21-33 percent, Overweight: 33-39 percent, Obese: Over 39 percent. 41-60 yrs old: Underfat: under 23 percent, Healthy: 23-35 percent, Overweight : 35-40 percent Obese: over 40 percent.
What is the largest muscle in the body?
The gluteus maximus is the largest muscle in the human body. It is large and powerful because it has the job of keeping the trunk of the body in an erect posture. It is the chief antigravity muscle that aids in walking up stairs. The hardest working muscle is the heart.
What is the best BMI for runners?
If your BMI is between 18.5 and 24.9, you are currently at healthy weight. For runners, an ideal BMI exists, as any race requires a certain amount of ground force that is dictated by your BMI measurement. The measurement influences speed differently for males and females, though.
What is wrong with BMI for athletes?
Body Mass Index’ biggest flaw is that it does not take into account the person’s body fat versus muscle (lean tissue) content. … A BMI calculation would class both of them as overweight. That calculation is probably right for the sedentary couch potato, but not for the athlete.
What is the average BMI range for a fit person?
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.