Textbook Problem

What is biological age (SMR) and why should it be used instead of chronological age to determine adolescent nutrient needs?

Biological age is based on sexual maturation rating. It assesses the degree of physical development, which can vary greatly among individuals of the same gender and age, thus is a better indicator of the nutrient needs of individuals as it provides a physiological estimate of needs based on growth velocity, body composition, and reproductive capacity.