Obesity screening
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Obesity Microchapters |
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Diagnosis |
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Treatment |
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Lifestyle Intervention and Counseling (Comprehensive Lifestyle Intervention) |
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Case Studies |
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USPSTF Recommendations and Guidelines on Management of Obesity |
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2017 Guidelines for Screening of Obesity in Children and Adolescents |
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AHA/ACC/TOS Guidelines on Management of Overweight and Obesity |
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2013 AHA/ACC/TOS Guidelines on Management of Overweight and Obesity |
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Obesity screening On the Web |
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American Roentgen Ray Society Images of Obesity screening |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Screening
Waist circumference
BMI does not take into account differing ratios of adipose to lean tissue; nor does it distinguish between differing forms of adiposity, some of which may correlate more closely with cardiovascular risk. Increasing understanding of the biology of different forms of adipose tissue has shown that visceral fat or central obesity (male-type or apple-type obesity) has a much stronger correlation, particularly with cardiovascular disease, than the BMI alone.[1]
The absolute waist circumference (>102 cm in men and >88 cm in women) or waist-hip ratio (>0.9 for men and >0.85 for women)[1] are both used as measures of central obesity.
In a cohort of almost 15,000 subjects from the National Health and Nutrition Examination Survey (NHANES) III study, waist circumference explained obesity-related health risk significantly better than BMI when metabolic syndrome was taken as an outcome measure.[2]
Body fat measurement
An alternative way to determine obesity is to assess percent body fat. Doctors and scientists generally agree that men with more than 25% body fat and women with more than 30% body fat are obese. However, it is difficult to measure body fat precisely. The most accepted method has been to weigh a person underwater, but underwater weighing is a procedure limited to laboratories with special equipment. Two simpler methods for measuring body fat are the skinfold test, in which a pinch of skin is precisely measured to determine the thickness of the subcutaneous fat layer; or bioelectrical impedance analysis, usually only carried out at specialist clinics. Their routine use is discouraged.[3]
Other measurements of body fat include computed tomography (CT/CAT scan), magnetic resonance imaging (MRI/NMR), and dual energy X-ray absorptiometry (DXA).[4]
References
- ↑ 1.0 1.1 Yusuf S, Hawken S, Ounpuu S, Dans T, Avezum A, Lanas F, McQueen M, Budaj A, Pais P, Varigos J, Lisheng L, INTERHEART Study Investigators. (2004). "Effect of potentially modifiable risk factors associated with myocardial infarction in 52 countries (the INTERHEART study): case-control study". Lancet. 364: 937–52. PMID 15364185.
- ↑ Janssen I, Katzmarzyk PT, Ross R (2004). "Waist circumference and not body mass index explains obesity-related health risk". Am. J. Clin. Nutr. 79 (3): 379–84. PMID 14985210.
- ↑ National Institute for Health and Clinical Excellence. Clinical guideline 43: Obesity: the prevention, identification, assessment and management of overweight and obesity in adults and children. London, 2006.
- ↑ Vanhecke TE, Franklin BA, Lillystone MA, Sandberg KR, deJong AT, Krause KR, Chengelis DL, McCullough PA. Caloric expenditure in the morbidly obese using dual energy X-ray absorptiometry. J Clin Densitomet 2006;9:438-444. PMID 17097530.