A 19-24.9 BMI is generally considered normal. BMI values apply to both men and women. Based on these guidelines, more than half of the US population is overweight. But remember that the BMI scale represents a guideline for an average individual, not a precise rule. Adolescence is a time when many things are changing.
Puberty involves a growth spurt along with sexual development.
It can be a time of rebellion during which teenagers are trying to assert their independence. It is also a time when eating disorders may develop. If you are worried that you or someone you know is overweight or underweight, it is best to discuss it with that person and a doctor. Knowing the person's physical development, activity level, fitness, history of illness, and other factors will help determine an appropriate weight. Always consult your own doctor about any opinions or recommendations with respect to your symptoms or medical condition.