Have you ever wondered if your weight is within the recommended range for your height and age? The Body Mass Index (BMI) is one of the most used methods in the world to quickly assess the relationship between weight and height. In this article, you will understand how the BMI table works, how it varies by age and sex, and find out which range you fit into.
What is BMI and Why it Matters
BMI is a simple calculation: weight ÷ (height x height). It serves as a general indicator to assess whether a person is underweight, at an adequate weight, overweight, or obese. Although it is a useful metric, BMI should be analyzed along with other factors (such as body fat percentage, body composition, and health conditions).
BMI by Age: Important Differences
- Adults (20 to 59 years): the classic BMI table is applied equally to men and women.
- Seniors (60+): slightly higher values may be acceptable, as low BMI can indicate a risk of malnutrition.
- Children and adolescents: use specific growth curves, taking into account age and sex.
BMI Table for Adults (WHO)
| Classification | BMI (kg/m²) |
|---|---|
| Underweight | Less than 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity grade I | 30.0 – 34.9 |
| Obesity grade II | 35.0 – 39.9 |
| Obesity grade III | 40 or more |
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Recommended BMI Table for Seniors (60+ years)
| Classification | BMI (kg/m²) |
|---|---|
| Low weight | Less than 22 |
| Adequate weight | 22 – 27 |
| Overweight | Greater than 27 |
Child and Adolescent BMI (2 to 19 years)
For children and adolescents, BMI is assessed in specific percentiles for age and sex. Example (10-year-old boys):
- Percentile < 5 → low weight
- Percentile 5–85 → healthy weight
- Percentile 85–95 → overweight
- Percentile > 95 → obesity
The recommendation is to use WHO or Ministry of Health growth curves.
Limitations of BMI
- It does not differentiate between muscle mass and body fat.
- It may overestimate obesity in very muscular people.
- It may underestimate risks in people with abdominal fat accumulation.
Conclusion
The BMI table by age and sex is a useful tool to understand where you fit in terms of weight and height. Use it as an initial guide, but always consult a health professional for individualized assessment.
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