Fish consumption and school grades in Swedish adolescents: A study of the large general population

Section of Occupational and Environmental Medicine, Institute of Medicine at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Acta Paediatrica (Impact Factor: 1.67). 10/2009; 99(1):72-7. DOI: 10.1111/j.1651-2227.2009.01545.x
Source: PubMed


To study the associations between fish intake and academic achievement as cognitive parameter among Swedish adolescents.
In 2000, a questionnaire including respiratory items, socioeconomic conditions and dietary information was mailed to all schoolchildren (n = 18 158), aged 15 and living in Västra Götaland region of Sweden. The questionnaire was returned by 10 837 subjects. One year later, the total school grades for each subject who had completed the questionnaire and who included their full personal identification number were obtained from the national registers. Multiple linear regression models were applied to evaluate the association between fish intake and academic grades among 9448 schoolchildren, while adjusting for potential confounders, e.g. parents' education.
Grades were higher in subjects with fish consumption once a week compared with subjects with fish consumption of less than once a week (reference group) [increment in estimate 14.5, 95% confidence interval (CI) 11.8-17.1]. Grades were even higher in subjects with fish consumption of more than once a week compared with the reference group (increment in estimate 19.9, 95% CI 16.5-23.3). In the model stratified for parents' education, there were still higher grades among subjects with frequent fish intake in all educational strata (p < 0.01).
Frequent fish intake among schoolchildren may provide benefits in terms of academic achievement.

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    • "Aberg et al found that frequent fish intake as compared to infrequent fish intake at age 15 in boys was associated with significantly higher cognitive performance as measured by combined intelligence, verbal skills, and visuospatial skills three years later [11]. Kim et al showed that after adjusting for sex and socioeconomic status, fish consumption among school children aged 15 years was significantly associated with higher school grades [10]. An important difference with our study, however, was that both studies divided fish consumption into only three categories in which the highest category represented eating fish more than once a week. "
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