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Unnecessary Dieting Intention and Behavior among Female Students in Naha City, Japan.

Myint KZ, Nonaka D, Jimba M, Nanishi K, Poudel KC, Yasuoka J, Miyagi M, Shinjo M, Kobayashi J - Trop Med Health (2015)

Bottom Line: They can result in negative psychological and physiological consequences.Body esteem was the second best predictor for dieting behavior.In conclusion, personal factors are more likely than social factors to drive the dieting decision.

View Article: PubMed Central - PubMed

Affiliation: Department of Community and Global Health, Graduate School of Medicine, University of Tokyo , Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033, Japan.

ABSTRACT
Weight concerns and dieting are prevalent among female adolescents both in Western and Asian countries. They can result in negative psychological and physiological consequences. This study aimed to examine the relative importance of social and personal factors in the decision to diet among female adolescent students in Japan, applying the Theory of Planned Behavior. Data were collected from five junior high schools and three high schools in Naha City, Okinawa Prefecture, in 2010, through self-administered questionnaires. The data of 756 female students were assessed. The independent variables included social factor variables (norms) and personal factor variables (attitude to dieting, perceived behavior control, body esteem, body-figure discrepancy and past dieting). The dependent variables were dieting intention and behavior. Hierarchical multiple regression analyses were performed to examine three models: model 1 (age and obesity index), model 2 (social factor variables with age and obesity index) and model 3 (all variables). Although model 2 failed to explain a substantial proportion of the variance, model 3 explained approximately a half of the variance for intention (R(2) = 0.507) and more than one third of the variance for behavior (R(2) = 0.376). Past experience of dieting was the best predictor of both dieting intention and behavior. Body esteem was the second best predictor for dieting behavior. In conclusion, personal factors are more likely than social factors to drive the dieting decision. Diet education programs should consider targeting frequent dieters and those with poor body esteem.

No MeSH data available.


Related in: MedlinePlus

Conceptual framework. Personal factor variables are highlighted in green; Social factor variables are highlighted in blue; Dependent variables are highlighted in red.(Source: Adapated from Icek Ajzen, 2006; http://people.umass.edu/aizen/tpb.diag.html)
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Figure 1: Conceptual framework. Personal factor variables are highlighted in green; Social factor variables are highlighted in blue; Dependent variables are highlighted in red.(Source: Adapated from Icek Ajzen, 2006; http://people.umass.edu/aizen/tpb.diag.html)

Mentions: With the exception of single-item measures, scores were averaged into one single index for each variable. With the exception of body dissatisfaction, higher scores reflected a stronger presence of the variable. The conceptual framework for the variables is described in Figure 1, and question items for key measures are listed in Table 1.


Unnecessary Dieting Intention and Behavior among Female Students in Naha City, Japan.

Myint KZ, Nonaka D, Jimba M, Nanishi K, Poudel KC, Yasuoka J, Miyagi M, Shinjo M, Kobayashi J - Trop Med Health (2015)

Conceptual framework. Personal factor variables are highlighted in green; Social factor variables are highlighted in blue; Dependent variables are highlighted in red.(Source: Adapated from Icek Ajzen, 2006; http://people.umass.edu/aizen/tpb.diag.html)
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4491491&req=5

Figure 1: Conceptual framework. Personal factor variables are highlighted in green; Social factor variables are highlighted in blue; Dependent variables are highlighted in red.(Source: Adapated from Icek Ajzen, 2006; http://people.umass.edu/aizen/tpb.diag.html)
Mentions: With the exception of single-item measures, scores were averaged into one single index for each variable. With the exception of body dissatisfaction, higher scores reflected a stronger presence of the variable. The conceptual framework for the variables is described in Figure 1, and question items for key measures are listed in Table 1.

Bottom Line: They can result in negative psychological and physiological consequences.Body esteem was the second best predictor for dieting behavior.In conclusion, personal factors are more likely than social factors to drive the dieting decision.

View Article: PubMed Central - PubMed

Affiliation: Department of Community and Global Health, Graduate School of Medicine, University of Tokyo , Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033, Japan.

ABSTRACT
Weight concerns and dieting are prevalent among female adolescents both in Western and Asian countries. They can result in negative psychological and physiological consequences. This study aimed to examine the relative importance of social and personal factors in the decision to diet among female adolescent students in Japan, applying the Theory of Planned Behavior. Data were collected from five junior high schools and three high schools in Naha City, Okinawa Prefecture, in 2010, through self-administered questionnaires. The data of 756 female students were assessed. The independent variables included social factor variables (norms) and personal factor variables (attitude to dieting, perceived behavior control, body esteem, body-figure discrepancy and past dieting). The dependent variables were dieting intention and behavior. Hierarchical multiple regression analyses were performed to examine three models: model 1 (age and obesity index), model 2 (social factor variables with age and obesity index) and model 3 (all variables). Although model 2 failed to explain a substantial proportion of the variance, model 3 explained approximately a half of the variance for intention (R(2) = 0.507) and more than one third of the variance for behavior (R(2) = 0.376). Past experience of dieting was the best predictor of both dieting intention and behavior. Body esteem was the second best predictor for dieting behavior. In conclusion, personal factors are more likely than social factors to drive the dieting decision. Diet education programs should consider targeting frequent dieters and those with poor body esteem.

No MeSH data available.


Related in: MedlinePlus