❚ Large scale surveys conducted by the

obesity rate among primary students is becoming more prevalent in Hong Kong. It is believed that lifestyle factors such as high fat and energy intake together with inactivity could contribute to obesity (Andersen R.E. et al., 1998; Andersen R.E., 2000). Surveys show that childhood obesity is likely to persist into adulthood (Serdula, M.K. et al, 1993), and obesity is a key risk factor for hypertension, cardiovascular disease and non-insulin-dependent diabetes mellitus (National Institutes of Health, National Heart, Lung, and Blood Institute, 1998), which are the contributing factors or leading causes o