Childhood Obesity Worldwide and in Hong Kong

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Chapter 1 Introduction 1.1 Significance of Childhood Obesity Worldwide and in Hong Kong 1.1.1 Definition of Childhood Obesity Overweight and obesity are defined as “abnormal or excessive fat accumulation that presents risk to health” (1), in which overweight is defined as having excess body weight for a particular height from fat, muscle, bone, water while obesity is defined as having excess body fat (2). Body Mass Index (BMI) is a commonly used and highly practical measure to indicate overweight and obesity, in which the person’s weight in kilograms is divided by the square of the person’s height in meters. A BMI of 23 – 24.9 kg/m2 is classified as overweight while a BMI of 25 – 29.9 kg/m2 is classified as obese for adults (lcsd). Severely obesity is indicated with a BMI equals or over 30 kg/m2. For children aged between 2 and 5, the calculated Body Mass Index is interpreted with BMI age- and sex- specific percentiles in order to take into account the differences of body fat among sex or age (4). Child is considered as overweight with the BMI obtained between the 85th and 95th percentile on the growth chart and obese if greater than the 95th percentile, as shown in Appendix ? (5). 1.1.2 Health Concern of Childhood Obesity Childhood Obesity was found to be significantly associated with the risk factors for cardiovascular diseases, like high blood pressure or high cholesterol level. Over 60% overweight children aged between 5 and 17 had at least one risk factor for
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