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    Published 3 April 2026 · Updated 4 April 2026 · 8 minutes reading time

    What Is Obesity? BMI Explained - and Why It Is Not Enough

    Obesity is more than a number on a BMI chart. This article explains how BMI works, where it helps, where it fails and why obesity is treated as a medical condition rather than a simple lifestyle issue.

    Understanding obesity and the limits of BMI

    Quick answer

    BMI is a useful screening tool, but it cannot fully describe a person's health, body composition or disease burden. Obesity is a medical condition assessed through BMI plus symptoms, comorbidity and overall risk.

    DD

    Dr. Dorél Lehrer

    Licensed Physician

    Medical Director at Viktenheten
    Experienced in medical weight management

    Verifierad av Socialstyrelsen

    Medicinskt granskad: 3 April 2026

    BMI is often the first thing people hear when weight is discussed, but it is not the whole story. Used correctly, BMI is a screening tool. Used alone, it can miss important parts of health and treatment need.

    How BMI is calculated

    BMI uses weight divided by height squared and gives a rough screening estimate for whether body weight is low, average, high or in the obesity range.

    Why BMI does not tell the whole story

    BMI does not measure fat distribution, muscle mass, symptoms or how strongly excess weight is affecting blood pressure, sleep or metabolism.

    Why obesity is a medical diagnosis

    Obesity is linked to higher risk of comorbidity and often behaves like a chronic disease that needs ongoing support rather than one-time advice.

    What treatment options exist

    Depending on severity and health risk, treatment may include lifestyle support, medication, structured follow-up and sometimes bariatric surgery.

    Sources and Further Reading

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