Body Mass Index(BMI)is a method available to express body size and is calculated in the metric system by dividing weight by the square of height.Although different estimates exist a BMI of 18.5 - 24.9 is considered normal for a member of the general population. A BMI between 25 and 29.9 is considered overweight and a BMI of 30 is the lower cutoff for obesity. For more active people and athlete, body weight alone cannot be used to estimate health risk. Many athletes engaged in strength and power oriented sports maintain greater muscle mass and might be characterized as over weight or even obese by general standards yet they may have a relatively low body fat level and therefore a desirable body composition and low health risk. Therefore, body weight and BMI are practical estimators of body size and overweight and obesity in the general population.
| BMI | Classification |
|---|---|
| <> | underweight |
| 18.5–24.9 | normal weight |
| 25.0–29.9 | overweight |
| 30.0–34.9 | class I obesity |
| 35.0–39.9 | class II obesity |
| > 40.0 | class III obesity |
The Effects of Obesity
1. High blood pressure, high cholesterol and abnormal blood lipid levels, insulin resistance and type 2 diabetes.
2. Bone and joint problems.
3. Shortness of breath that make exercise sports or any physical ativitiy more difficult and may aggrarate the symptoms or increase the chances of developing asthma.
4. Restless or disordered sleep patterns, such as obstructive sleep apnea.
5. Tendency to mature earlier (Overweight kids may be taller and more sexuality mature than their peers, raising expectations that they should act as old as they look, not as old as they are. Overweight girls may have irregular menstrual cycles and fertility in adulthood).
6. Liver and gall blandder disease.
7. Depression.
Further Reading
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