In obesity, BMI is?

Appeared in: ESIC Nursing Officer 2016 (Shift -2)

Explanation

Obesity in adults is defined by a Body Mass Index (BMI) of 30.0 kg/m² or higher, according to the World Health Organization (WHO) classification.
BMI is a standardized, simple index of weight-for-height used to screen for weight categories that may lead to health problems.
The threshold of 30.0 kg/m² is the universally accepted starting point for the classification of obesity, which is further subdivided into Classes I, II, and III based on increasing severity and health risk.

Option A: A BMI greater than 20 kg/m² is not the threshold for obesity. This value falls within the normal weight range (18.5-24.9 kg/m²).
Option B: A BMI greater than 25 kg/m² is the standard definition for being overweight, not obese. The obesity threshold is higher.
Option D: While a BMI greater than 36 kg/m² indicates a person is obese, it does not represent the initial threshold for the condition. It falls into the category of Class II Obesity.

Visual 1: Infographic. A color-coded chart illustrating the different BMI categories (Underweight, Normal, Overweight, Obesity Classes I-III) with their corresponding numerical ranges. This provides a quick visual reference for the classification system.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain BMI classification for obesity as background academic context rather than a clinical decision trigger.
Nurses routinely calculate and document BMI as a vital part of patient assessment to screen for nutritional status and potential health risks associated with abnormal body weight.
A high BMI (30 or above) alerts the nurse to assess for and educate the patient about obesity-related comorbidities, such as hypertension, type 2 diabetes, dyslipidemia, and sleep apnea.
What if? If a patient of South Asian descent has a BMI of 28 kg/m², the nurse should recognize an increased health risk. For many Asian populations, the threshold for obesity is lower (often >25.0 or >27.5 kg/m²) due to a higher risk of metabolic diseases at a lower body fat percentage.

How to Approach the Question

First, identify the core concepts in the question: 'obesity' and 'BMI'.
Recognize that this is a factual recall question requiring knowledge of a standard medical definition.
Recall the World Health Organization (WHO) classification for adult BMI.
Systematically evaluate each option against the standard classification: Is >20 the cutoff? No, that's normal. Is >25 the cutoff? No, that's overweight. Is >30 the cutoff? Yes, that's the start of obesity.
Select the option that correctly identifies the internationally recognized threshold for obesity.

Concept Tested & Keywords

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Attempt every question from this paper in a timed mock, then review the full solution for each one.