A crude measure of weight relative to height, BMI is commonly used to diagnose obesity—even though many experts and professional groups agree it’s an imperfect tool that on its own reveals very little about someone’s health.

The way obesity is diagnosed needs to become more sophisticated, an international commission has concluded. Using body-mass index to tell who is overweight or obese is not reliable and can result in misdiagnosis,

Relying on BMI alone to diagnose obesity is problematic as some people tend to store excess fat at the waist or in and around their organs, such as the liver, the heart or the

Body Mass Index, or BMI, has long been criticized as an unreliable method for measuring obesity — and now a group of experts is sharing new recommendations for how to use it.

An international committee of scientists has proposed changing the way obesity is defined and diagnosed. The proposal adds more ways to measure body composition and fat.

Under recommendations released Tuesday night, obesity would no longer be defined solely by BMI, a calculation of height and weight, but combined with other measurements, such as waist circumference, plus evidence of health problems tied to extra pounds.