For men, which expression correctly estimates the basal metabolic rate (BMR) using the Mifflin-St Jeor equation?

• A. BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5.
• B. BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161.
• C. BMR = 9.5 × weight(kg) + 4.0 × height(cm) − 6 × age.
• D. BMR = 12 × weight(kg) + 7 × height(cm) − 4 × age + 10.

Answer: (A)

For men, the Mifflin-St Jeor estimate uses weight in kilograms, height in centimeters, and age in years, with a positive gender-specific constant. The form is BMR = 10 × weight + 6.25 × height − 5 × age + 5. The plus 5 at the end accounts for the higher resting energy expenditure typically seen in men compared with women, after adjusting for body size.

This is the standard male version of the equation. Variants that use a female constant (−161), or that alter the coefficients (for example, 9.5 and 4.0 with a different age term, or a form like 12 × weight + 7 × height − 4 × age + 10) do not match the Mifflin-St Jeor formulation for men.

Example: a man weighing 70 kg, 175 cm tall, aged 30 would have an estimated BMR of 10×70 + 6.25×175 − 5×30 + 5 ≈ 1649 kcal/day.