Obesity—weighing up the facts Karen Bishop and Ilona Brockway.

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Presentation transcript:

Obesity—weighing up the facts Karen Bishop and Ilona Brockway

Obesity crisis on our hands Sydney Morning Herald, 9 April 2010 Obesity headed for 75 per cent Sydney Morning Herald, 13 May 2010 Australia: Fat nation ABC News, 20 June 2008 Australia’s ticking 'fat bomb' The Age, 20 June 2008 Australia counts the heavy cost of obesity Herald Sun, 1 June 2010 Taxpayers to fund war on obesity The Daily Telegraph, 2 June 2009

Excess body weight Why assess excess body weight? Population measures Current status Trends in obesity Variation among different populations Prevention

Why body weight is measured? Health risks associated with overweight and obesity –Cardiovascular disease –Diabetes (type II) –Chronic kidney disease Also for colorectal cancer, osteoarthritis and depression

How body weight is assessed Body mass index, BMI (kg/m 2 ) –Categories Normal healthy weight (18.5 to less than 25) Overweight (25 to less than 30) Obese (30 or more) –Self-reported versus measured height and weight –Useful population measure Other measure include waist circumference and waist-hip ratio

Overweight or obese MalesFemales Overweight42%31% Obese25%24% Overweight or obese 67%55% Measured data, NHS 2007–08

Trends in mean weight by sex Measured weight from various RFPS, AusDiab and NHS, 25–64 year olds

Trends in BMI Self-reported height and weight, 18 years plus, various NHS surveys

Trends in obesity by age MalesFemales Self-reported height and weight, 18 years plus, various NHS surveys

Comparisons for obese females Prevention of cardiovascular diseases, diabetes and chronic kidney disease (AHIW 2009, Cat. no. PHE 118)

Comparisons for obese males Prevention of cardiovascular diseases, diabetes and chronic kidney disease (AHIW 2009, Cat. no. PHE 118)

The ‘weighting’ room Overweight (≥25 kg/m 2 ) Obese (≥30 kg/m 2 ) Self-reported BMI from NHS 1995 and 2007–08

Looking abroad OECD Online database, viewed June 2010

Prevention Promote healthy lifestyles Prevent further gain Commitment Monitor and evaluate—permanent, regular and consistent national study covering biomedical measures Australian Health Survey

Take-away food for thought Data indicate a growing prevalence in obesity Prevalence of obesity is different in different population groups Regular, consistent national data for monitoring the situation