Define the BMI and percent body fat criteria for the classification of morbid obesity. What BMI is associated with morbid obesity?
What will be an ideal response?
• Body mass index (BMI) is usually used as a common method for determining if someone is obese since it is easy and quick. BMI>30 is considered obese.
• Obesity can be defined as a fat percentage greater than ≥25% fat in males and ≥33% in females. However, this requires tools and skill so BMI is more commonly used even though BMI does not factor in body composition. The National Institutes of Health do not recognize percent body fat as criteria for morbid obesity.
• BMI ≥40 is considered morbidly obese for both men and women
• BMI ≥ 35 plus one or more comorbid condition
• 100 lbs or more over IBW
• For children, obesity is defined using the CDC growth charts that provide BMI for age data. ≥ the 95th percentile or ≥30 kg/m2 (whichever represents the lower weight) is considered an obese classification.
• The Dietary Guidelines for Americans have different classifications for obesity. Class 1 is a BMI of 30-34.9; class 2, a BMI of 35-39.9; and extreme obesity (class 3), a BMI ≥40 kg/m2.
• Waist circumference can be used to determine mild obesity but it is a poor indicator of morbid obesity. A waist circumference >40 in. men or >35 in. in women indicates obesity or increased risk for CVD. This is based on the fact that central adiposity is thought to propose a higher risk for CVD than gynoid obesity.
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