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Body Mass Index (BMI) is widely used to as a tool to
determine an individual's optimum body weight. It is essentially the
relationship between a person's weight and height. The simple formula used
to calculate it is:
BMI= (Weight in Kilograms) / (Height in meters squared)
This measure also known as the Quetelet Index was developed around
1830 to 1850 and is attributed to a Belgian named Adolphe Quetelet.
Why exercise? Most of us do it because we want to reap the benefits that tag along such as weight management, muscle tone, fat-loss, strength gain, etc... Continued...
Generally, BMI of 20 to 25 is considered healthy. BMI of less than 20 suggests
an individual is underweight while 25 to 29 indicates an overweight person.
30 and above is a sign of obesity.
BMI provides an estimation of fat content in a person's body. Although research
has confirmed a strong correlation between fat content and BMI, results may
vary from group to group. For instance athletes may develop significantly
higher muscle mass. Muscle contributes more to overall weight than fat. As
a result their BMI may be higher than average despite a lower fat content.
Conversely, elderly people who have suffered some deterioration of muscle
mass may have lower BMI with higher fat content.
Higher BMI's are linked with greater risk of disease and death. Persons with
a BMI of 25 to 29 have a higher risk of coronary heart disease, strokes, type
2 diabetes, hypertension (high blood pressure), sleep apnea and respiratory
problems, high LDL (bad) cholesterol and low HDL (good) cholesterol. Some
cancers such as endometrial, breast and colon cancers have also been linked
to being overweight. The risks of these diseases and death are magnified many
times over in the 30+ BMI - obese category.
Everyone knows that to lose weight you need to eat less and exercise more. Exercise is essential whether you choose to lose weight or maintain your present weight. Someone that increases the amount they exercise, but maintains the same diet and calorie intake, will almost certainly lose weight.... Click here to read the rest of this article
However, BMI is just one of the predictors of health problems and must always
be used in conjunction with other indicators. For instance body shape has
also been shown to be a predictor of the risk of disease. Fat concentrated
around the abdominal area (apple shaped body) is considered less healthy than
a similar mass of fat concentrated around the buttocks and hips (pear shaped
body). BMI also needs to be interpreted differently for different groups such
as children and pregnant and nursing women.
Electrical impedance tests or fatfold measures are more accurate means of
physically measuring body fat than BMI. However, they all involve a visit
to the Doctor's office or gym. BMI has the huge advantage of simplicity. Anyone
can calculate it in the comfort of their own home and it is extremely useful
in monitoring one's weight as long as one remembers its limitations.
Body Mass Index - What Shape are You In?
by Michael Claasz
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