Forget BMI, try TPI for teens

There is a much better way than BMI to measure body fat in adolescents, say US nutrition scientists, whose research casts doubt on current practice.

Tri-ponderal mass index (TPI) is more accurate and easier to use than BMI z-scores and percentiles, they say.

That’s because weight is not proportional to height squared during adolescence when growth is rapid.

Their findings, published in JAMA Pediatrics, challenge the accuracy of BMI (weight in kilograms divided by height in metres squared) in