Doctors may be getting childhood obesity wrong, new research suggests

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A new global definition ofchildhood obesityis 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 �Friends.”

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“There’s a push to really understand the impact ofbody faton 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.

While clinical obesity rates are substantially lower in youth, they surge with age, peaking at 52% among adults aged 65 to 74 as chronic conditions accumulate.(iStock)

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 relatedhealth problemsor limitations in daily activities.

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These indicators can range from elevated blood pressure and abnormal blood sugar to impaired mobility or poor sleep.

Longmore noted that many children defined as obese by BMI metrics are active,sleeping well, attending school and otherwise healthy.

child and his dad washing and drying dishes together in their home

The new diagnostic model formalizes what many pediatricians already practice by assessing blood pressure, blood sugar, sleep and physical mobility alongside size.(iStock)

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

While clinical obesity appears to be significantly less prevalentin youthunder 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.

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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, particularlyGLP-1 receptor agonists, are gaining in popularity.

Four children smile and enjoy ice cream cones.

Many children categorized as obese by traditional BMI standards are fit, active and otherwise healthy, without secondary medical complications.(iStock)

However, Longmore cautioned that the study’s dataset reflects pre-GLP-1 records, making the long-term impact of these treatments an open area for future study.

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“This is really just the start of understanding what this new diagnostic entity means, and we really need more research,” Longmore said, emphasizing that while the definition refines clinical diagnoses, early health interventions andlifestyle preventionremain critical for children at risk.

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