Healthy weight and BMI

Always a touchy subject but maintaining a healthy weight is important for good health. The best indication of your weight is your Body Mass Index or BMI.

Always a touchy subject but maintaining a healthy weight is important for good health. The best indication of your weight is your Body Mass Index or BMI.

This measures the amount of fat you have on your body, determining whether you are overweight or not. To calculate your BMI, you can use the following formula:

Weight in kilograms / (height in metres x height in metres)
For example: if you weigh 65kg and are 1.7m tall, your formula would be: 65/(1.7x1.7) = 22.49% BMI.

But what does this mean? The guidelines below indicate how healthy your BMI is, but note, this is only a guideline.

  • 20-25 - you have a healthy weight range for young and middle-aged adults.
  • 26-30 - you are overweight
  • >30 - you are obese

Of course, there are online tools to help you calculate your BMI. Click here to find out your BMI.


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    24th Mar 2014
    Research from Libraries and Internet.

    A number of studies have demonstrated that some obese individuals have lower cardiovascular risk and an improved metabolic profile, while a subset of "normal-BMI" people are metabolically unhealthy and have increased mortality risk.

    A team of researchers at the University of Virginia, Charlottesville, found better post-surgical short-term survival rates among obese people than patients of normal weight3. Patients with a BMI of 23.1 or less were more than twice as likely to die within 30 days of surgery than those with a BMI of 35.3 or more.
    BMI is confusing, highly inaccurate and is not even a rough guide to an individuals health & well-being.

    The continuous hoo-haa about 'fat, obese, overweight' people revolves around generating more MONEY!

    The bone structure and genetics determine the body size in conjunction with eating in moderation.

    Drs. Lazar and Ahima point out that the true impact of obesity may not be fully understood, because population studies focus on the link between BMI, health and mortality risks, without taking into account how unintentional/intentional weight loss/gain may affect these outcomes.

    Nick Trefethen, Professor of Numerical Analysis at Oxford University's Mathematical Institute, in a letter to The Economist explained that BMI leads to confusion and misinformation.
    Adolphe Quételet by Joseph-Arnold Demannez
    Adolphe Quetelet devised the BMI for measuring human body shape. It has prevailed for over 160 years

    BMI = weight in kilograms divided by height in meters squared.

    Professor Trefethen believes that the BMI height2/weight term divides the weight by too much in short people and too little in tall individuals. This results in tall people believing they are fatter than they really are4, and short people thinking they are thinner.

    BMI was devised in the 1830s by Lambert Adolphe Jacques Quetelet (1796-1874), a Belgian mathematician, sociologist, statistician and astronomer.

    Trefethen explained that during Quetelet's time there were no calculators, computers or electronic devices - which is probably why he opted for a super-simple system. Trefethen wonders why institutions today on both sides of the Atlantic continue using the same flawed-BMI formula.

    "Perhaps nobody wants to rock the boat", Trefethen added.

    Trefethen believes a better calculation than the present weight/height2 for BMI would be weight/height2.5. "Certainly if you plot typical weights of people against their heights, the result comes out closer to height2.5 than height2."
    Tassie Devil
    25th Mar 2014
    according to my BMI I am overweight however I am a size 12 exercise most days and also work in the garden and yard ride my bike and go swimming 2-3 x per week somehow the BMI chart does not seem to be correct

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