While BMI is a useful screening tool for the general population, it has several significant limitations that you should be aware of.

Muscle vs. Fat

BMI does not distinguish between muscle mass and body fat. Because muscle is denser than fat, highly muscular individuals (like athletes or bodybuilders) may have a high BMI that classifies them as "overweight" or "obese," even though they have very low body fat.

Fat Distribution

BMI doesn't account for where fat is stored in the body. Research shows that abdominal fat (visceral fat) carries much higher health risks than fat stored in other areas, such as the hips or thighs.

Age and Ethnicity

The relationship between BMI and body fat can vary by age, sex, and ethnicity. For example, older adults tend to have more body fat than younger adults with the same BMI. Similarly, certain ethnic groups may face higher health risks at lower BMI levels.