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<正>Aims Childhood Obesity becomes a global epidemic in both the developed and developing countries(WHO,2003,IOTF,2005),and yet Hong Kong was not immune to this"epidemic".According to statistics provided by the Student Health Service of the Department of Health(DH),the obesity rate among primary school students rose from 16.4% in 1997-98 to 21.3%in 2007-08.It was expected that the obesity rate will continue to raise.