Relationship between body weight perception and weight-related behaviours.

1 Several studies have reported an increasing trend in adolescents being overweight and in the incidence of obesity in Asian and Western countries such as Australia, England, Germany, Iceland, Scotland, Chile and Japan. 2 In Thailand, the prevalence of this problem among 7 th and 12 th grade students is 10.6% and 3.5%, respectively. 3 Previous studies have reported a wide range of causes of being overweight and obese, such as lack of physical activity and unhealthy dietary behaviours. 4 , 5 Psychosocial factors have received increasing attention because of the multifactorial nature of obesity.

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