Body Mass Analysis

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Classification systems

Obesity is associated with a significant increase in morbidity (from conditions including diabetes mellitus, hypertension, dyslipidemia, heart disease, stroke, sleep apnea, and cancer) and mortality. Weight loss is associated with a reduction in obesity-associated morbidity.

Body Mass Index (BMI)

Based on the recommended classifications for BMI adopted by the National Institutes of Health (NIH) and World Health Organization (WHO).

White, Hispanic, and Black individuals:

Underweight: <18.5 kg/m^2
Normal weight: ≥18.5 to 24.9 kg/m^2
Overweight: ≥25.0 to 29.9 kg/m^2
Obesity: ≥30 kg/m^2
- Class I: 30.0 to 34.9 kg/m^2
- Class II: 35.0 to 39.9 kg/m^2
- Class III: ≥40 kg/m^2
- Super obesity: ≥50 kg/m^2

Asian subjects:

Underweight: <18.5 kg/m^2
Normal weight: ≥18.5 to 22.9 kg/m^2
Overweight: ≥23.0 to 24.9 kg/m^2
Obesity: >25 kg/m^2

Waist circumference

Measured with a flexible tape placed on a horizontal plane at the level of the iliac crest as seen from the anterior view.

People with elevated waist circumference are considered to be at increased risk of developing heart disease, diabetes, hypertension, dyslipidemia, non-alcoholic fatty liver disease (NAFLD), and have higher overall mortality rates.

Elevated waist circumferences:

Males
- ≥102 cm (40 in)
- Asian population ≥90 cm (35 in)
Females
- ≥88 cm (35 in)
- Asian population ≥80 cm (31 in)

Waist Height ratio (WHtR)

WHtR Classification	Adult Women	Adult Men	Children <= 15 years
Extremely Slim	<= 34%	<= 34%	<= 34%
Slim	35-41%	35-42%	35-45%
Healthy	42-48%	43-52%	46-51%
Overweight	49-53%	53-57%	52-63%
Very Overweight	54-57%	58-62%	>= 64%
Morbidly Obese	>= 58%	>= 63%	-

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