Introduction

The Body Mass Index (BMI) is one of the methods for measuring overweight and obesity. It is calculated by dividing the body weight (in kg) by the square of height (in m): kg/m². For assessing obesity in adult populations, according to the World Health Organization Asian Standard, BMI 23.0-below 25.0 kg/m² is classified as overweight and BMI 25.0 kg/m² or above is classified as obesity.

Obesity increases the risk for a number of diseases, such as hypertension, heart diseases, hypercholesterolaemia, diabetes mellitus, cerebrovascular disease, gall bladder disease, osteoarthritis, sleep apnoea and some types of cancer (breast, prostate, colorectal and endometrial).

Situation in Hong Kong

The Behavioural Risk Factor Survey April 2010 revealed that 39.2% of the population aged 18-64 were classified as overweight and obese (BMI ≥ 23.0), including 21.0% as obese. A higher proportion of males (48.3%) than females (31.4%) were classified as overweight and obese. People aged 45-54 had a highest rate (51.4%) of overweight and obese.

Prevention

Balanced diet and regular physical activity are the proven ways to achieve and maintain ideal body weight.

Related information

You may browse the Health Zone for further advice on physical exercise, healthy diet and common killer diseases associated with obesity.