BMI for normal weight –
**Core Concept**
The **Body Mass Index (BMI)** is a widely used measurement to categorize individuals into various weight categories. It is calculated by dividing the individual's weight in kilograms by the square of their height in meters. BMI is a key indicator of **health status** and **disease risk**.
**Why the Correct Answer is Right**
A normal weight is typically defined as a BMI between 18.5 and 24.9. This range is associated with the lowest risk of **chronic diseases** such as diabetes, hypertension, and cardiovascular disease. A BMI within this range indicates a healthy balance between weight and height.
**Why Each Wrong Option is Incorrect**
**Option A:** A BMI below 18.5 is considered underweight, which can lead to health problems such as osteoporosis and impaired immune function.
**Option B:** A BMI above 25 is considered overweight, which increases the risk of chronic diseases.
**Option D:** A BMI above 30 is considered obese, which significantly increases the risk of chronic diseases.
**Clinical Pearl / High-Yield Fact**
Remember that BMI is not a perfect measure, as it does not account for **muscle mass** or **body composition**. However, it is a useful tool for assessing weight status and **health risks** in a clinical setting.
**Correct Answer:** B. 18.5-24.9