Scientists in Italy have discovered that the popular Body Mass Index (BMI) often gives the wrong answer about a person’s weight status. When they measured body fat with a special scanner called DXA, many people were placed in the wrong category.
What Is BMI and Why Is It Questioned?
BMI is a simple calculation that uses height and weight. It does not look at actual body fat or where fat is stored. Because of this, doctors and policymakers sometimes rely on a tool that can be misleading.
How the Study Was Done
Researchers from the Universities of Verona and Beirut checked 1,351 adults aged 18‑98. All participants were White Caucasian and were referred to a university health center. They first recorded each person’s BMI, then measured body fat percentage with DXA, which is considered the gold‑standard method.
Big Differences Between BMI and DXA
According to BMI, 14.1% of the group were obese and 26.2% were overweight. DXA told a different story: only 13.2% were truly obese and 23.4% were overweight. In other words, more than one‑third of the people classified as obese by BMI were actually just overweight, and over half of those called overweight were really in the normal range.
The two methods agreed best for people in the normal‑weight range (BMI 18.5‑25), matching in 78% of cases. However, even in this group, 22% were placed in a different category when DXA was used.
What the Experts Say
Professor Marwan El Ghoch, who led the research, said the findings show a large portion of the Italian population is mis‑categorized by BMI. He suggests that health guidelines should add other tools, such as DXA scans, simple skin‑fold tests, or waist‑to‑height ratios.
What This Means for You
If you rely only on BMI, you might think you are overweight or obese when you are not, or you could miss a real health risk. Talking to a health professional about body‑fat measurements can give a clearer picture of your health.