Doctors may be getting childhood obesity wrong, new research suggests

A new global definition of childhood obesity is reframing how doctors evaluate youth health, looking past traditional body mass index (BMI) measurements to focus on actual physiological impacts.

According to research from the Murdoch Children's Research Institute in Australia, just 2.1% to 4.9% of children and adolescents qualify as clinically obese under the revised standard, compared to 7% to 10.8% under standard BMI calculations.

Dr.

Danielle Longmore, a pediatrician at the Melbourne institute, outlined the shift during an appearance on "Fox & Friends." YOUR WAISTLINE COULD REVEAL A HIDDEN HEART RISK YOUR BMI MISSES, MAJOR STUDY FINDS "There's a push to really understand the impact of body fat on health," Longmore said.

"BMI is really just measuring size.

So it doesn't really have a way of capturing whether somebody is well or unwell." The traditional BMI measurement calculates a person's weight relative to their height.

The new definition, developed by an international panel of medical experts convened by the medical journal The Lancet, requires evidence of both excess body fat and related health problems or limitations in daily activities.

WEIGHT GAIN IN CERTAIN DECADE OF LIFE MAY BE MORE DANGEROUS, STUDY SUGGESTS These indicators can range from elevated blood pressure and abnormal blood sugar to impaired mobility or poor sleep.

CLICK HERE TO SIGN UP FOR OUR HEALTH NEWSLETTER Longmore noted that many children defined as obese by BMI metrics are active, sleeping well , attending school and otherwise healthy.

"I think this definition just really clarifies what people have been doing in actual clinical practice ," Longmore said, noting that physicians typically evaluate patients for underlying complications rather than relying strictly on scale weight.

CLICK HERE FOR MORE HEALTH STORIES While clinical obesity appears to be significantly less prevalent in youth under the new model, the trajectory reverses dramatically later in life.

The study, which analyzed nearly 800,000 individuals across their lifespan, found that clinical obesity rates climbed through adulthood.

TEST YOURSELF WITH OUR LATEST LIFESTYLE QUIZ Among adults ages 65 to 74, the rate of clinical obesity reached 52%, as health problems linked to excess body fat became more common with age.

The findings come at a time when prescription weight-loss medications, particularly GLP-1 receptor agonists , are gaining in popularity.