Which statement defines Underweight BMI?

Which statement defines Underweight BMI?

• A. BMI between 18.5 and 24.9
• B. BMI between 25 and 29.9
• C. BMI less than 18.5
• D. BMI less than 18.5 kg/m^2

Answer: (D)

Underweight is defined by a BMI that falls below a specific cutoff, specifically less than 18.5 kilograms per square meter. BMI is calculated as weight in kilograms divided by height in meters squared, and health guidelines use the threshold of 18.5 kg/m^2 to separate underweight from normal weight. The statement that specifies “less than 18.5 kilograms per square meter” exactly matches this standard definition, making it the correct choice. The other ranges point to normal weight or overweight, and one option omits the unit, which is essential for the formal BMI definition.

Underweight is defined by a BMI that falls below a specific cutoff, specifically less than 18.5 kilograms per square meter. BMI is calculated as weight in kilograms divided by height in meters squared, and health guidelines use the threshold of 18.5 kg/m^2 to separate underweight from normal weight. The statement that specifies “less than 18.5 kilograms per square meter” exactly matches this standard definition, making it the correct choice. The other ranges point to normal weight or overweight, and one option omits the unit, which is essential for the formal BMI definition.