Title : Is BMI (body mass index) the most effective way to determine if you are overweight and at risk of developing cardiovascular diseases?
link : Is BMI (body mass index) the most effective way to determine if you are overweight and at risk of developing cardiovascular diseases?
Is BMI (body mass index) the most effective way to determine if you are overweight and at risk of developing cardiovascular diseases?
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The most popular
question that is always asked when it comes to weight loss is how much one should
weigh for a given age and height. Calculating our BMI is one of the ways to
determine if we are normal, overweight or obese
When determining how much one
should weight, the persons height, age, bone density, muscle fat ratio and sex
should be taken into account. BMI uses only weight and height to determine if
one is overweight. However, while some health experts say BMI is the best
method to determine if an individual is overweight, Recent research has shown that BMI alone should not be used to determine if one is overweight because muscle-fat
ration and bone density can give a false overweight or underweight results.
How
to use BMI to determine if you are normal, overweight or obese
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The most accurate way to determine
if you are normal, overweight or obese is to calculate your BMI. It is a very
easy procedure and you can do this at home or at a health facility.
You will need 2 values to determine
your BMI; your weight in Kg (for example 75Kg) and your height in meters (for
example 1.65 m).
Calculate your BMI using the formula
below:
BMI = Weight/Height2
Weight is in kilograms and height is
in meters
Example:
Jane has a weight of 75 kg and her height
is 1.65m. Her BMI is
75/ (1.65)2 = 75/ (1.65×1.65)
= 75/2.7225 =27.55
A BMI of 18.5 to 24.9 is considered
normal
A BMI of 25 to 29.9 is considered
overweight
A BMI of 30 and above is considered
obesity
Short comings of BMI
- BMI has not taken into account that
someone with low bone density (osteoporosis) might get a false BMI reading. A
person who has a low bone density may weigh less than someone who has the same body
fat and height. BMI will therefore consider the person with low bone density to
be healthy, whereas he is not. - BMI does not take into account muscle
mass. A wrestler may have a higher BMI than an overweight person, whereas he is
healthier than the overweight person. This is because his excess weight is due
to his well built up muscles and not necessarily body fats
Waist-to-height
ratio
According to Doctor Margaret Ashwell
who worked and the British Nutritional Foundation and other health experts across the globe, keeping your waist
circumference to less than half of your height can help you stay healthy and
keep track of your weight. BMI does not take into account, fat that is stored
around the abdomen and internal organs. Fat stored in the abdomen is more
dangerous than fat that is stored around the gluteal area or hips.
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A woman who has a weight of 170 cm should
make sure that her waist measurement (circumference of her waist) is below 85
cm
This is easier to calculate and can
be done at home.
Waist-to-hip ratio
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| image source: wikipedia.org |
Waist-to-hip ratio is another tool to
determine if your weight is normal. It is calculated by dividing the
circumference of your waist (measured above the belly button) by the
circumference of your hips.
Example: If a woman has a waist
circumference of 90 cm and a hip circumference of 110 cm, her waist-to-hip
ratio is 90 divided by 110 which is 0.82
For females:
- A waist-hip ratio of 0.9 and above
means you are at risk of having diseases of the cardiovascular system - A waist-hip ratio of 0.8 to 0.89
means you are at moderate risk of having diseases of the cardiovascular system - A waist-hip Ratio of less than 0.8
means your chances of having diseases of the cardiovascular system are low.
For males:
- A waist-hip ratio of 1 and above
means you are at risk of having diseases of the cardiovascular system - A waist-hip ratio of 0.9 to 0.99
means you are at moderate risk of having diseases of the cardiovascular system - A waist-hip Ratio of less than 0.9
means your chances of having diseases of the cardiovascular system are low.
Studies have shown that a waist-hip
ratio is more effective in predicting and preventing diseases of the
cardiovascular system that BMI
Sources:
http://www.medicalnewstoday.com/info/obesity/how-much-should-i-weigh.php
http://www.healthstatus.com/calculate/waist-to-hip-ratio
http://www.telegraph.co.uk/news/health/news/10054519/Waist-to-height-ratio-more-accurate-than-BMI.html
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