Body Mass Index

This index is a measure of fatness or leanness, and is calculated by dividing one's weight in kilogrammes by the square of their height in metres.

The formula is:

BMI = Weight in kg/(Height in metres)2

For example, an adult weighs 75 kg and is 1.7 metres tall. His BMI is:

If the BMI of an adult (except a pregnant woman) is:

• below 18.5, they are underweight;

• 18.5-25, they are within the normal range;

• 25-30, they are probably overweight;

• over 30, they are probably obese.

Gaining Weight

Being significantly underweight can be a serious problem for anyone, especially children, adolescents, pregnant and breastfeeding mothers and the elderly. Underweight in children is usually caused by a combination of inadequate food intake and recurrent episodes of infections.

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