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Shortcomings of BMI? Evidence1 #371489 Although BMI is used widely as an indicator of obesity it has several shortcomings as an indicator.

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Tackling obesity in the UK »Tackling obesity in the UKTackling obesity in the UK☜With concern growing that the Foresight analysis—that 50% of the UK population could be obese by 2050, at an annual cost to the nation of around £50 billion per year [2]—substantially underestimates the scale of the unfolding obesity crisis, the College of Contemporary Health is working with the wider policy community to develop a whole systems map of the obesity crisis and the potential responses.☜F1CEB7

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Causes of obesity »Causes of obesityCauses of obesity☜Understanding the causes of obesity is critical to the success of prevention and treatment strategies. However, while (simply put) obesity occurs when energy intake from food and drink consumption is greater than energy expenditure through the body’s metabolism and physical activity over a prolonged period (resulting in the accumulation of excess body fat), in reality many complex behavioural and societal factors contribute systemically to the current crisis and no single influence dominates.☜5CD992

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What is obesity? »What is obesity?What is obesity?☜Obesity is a medical condition in which excess body fat has accumulated to the extent that it may result in increased health problems and reduced life expectancy. As central obesity (excess ectopic fat stored around major organs and abdomen) is the most dangerous form to health, waist measurement can be a key indicator of risk. Generally, men with a waist circumference of 94cm or more (and women of 80cm or more) are more likely to develop obesity-related health problems.☜AECCD8

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Shortcomings of BMI?Shortcomings of BMI?☜Although BMI is used widely as an indicator of obesity it has several shortcomings as an indicator. ☜8CC79C

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Limited diagnostic accuracy »Limited diagnostic accuracyLimited diagnostic accuracy☜The diagnostic accuracy of BMI to diagnose obesity is limited, particularly for individuals in the intermediate BMI ranges.☜8CC79C

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The BMI-mortality curve isn't constant for age »The BMI-mortality curve isn't constant for ageThe BMI-mortality curve isn't constant for age☜BMI should be interpreted differently for different age groups.☜8CC79C

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The Obesity Paradox: higher BMI may not always be bad »The Obesity Paradox: higher BMI may not always be badThe Obesity Paradox: higher BMI may not always be bad☜Research suggests that while being underweight and highly obese are both associated with increased mortality relative to the normal weight category, being overweight is not associated with excess mortality. Moreover, people with obesity who have preserved fitness and have no notable metabolic abnormalities have a very favourable prognosis; suggesting that improving fitness rather than weight loss per se should be emphasised in patients with overweight and class I obesity (BMI 30–35 kg/m2).☜8CC79C

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Link[1] BMI, Obesity & mortality: three grand challenges

Author: Mike Gibney
Publication info: 2014 December, 15
Cited by: David Price 3:06 PM 3 January 2015 GMT
Citerank: (1) 399913Shortcomings of BMI?Although BMI is used widely as an indicator of obesity it has several shortcomings as an indicator.648CC79C
URL:

http://gibneyonfood.blogspot.co.uk/2014/12/bmi-obesity-mortality-three-grand.html

Excerpt / Summary

BMI (kg/m2) is one of the most widely used anthropometric measures and is virtually the sole criterion for judging obesity, its extent and its links to disease and mortality. When something is that widely used, there is a tendency to forget about any shortcomings in its use. In this blog I look at three aspects of BMI to remind one and all that in the BMI-obesity-mortality triangle, all is not rosy.

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Entered by:- David Price
NodeID: #371489
Node type: Evidence
Entry date (GMT): 1/3/2015 3:04:00 PM
Last edit date (GMT): 8/1/2015 6:59:00 PM
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