Understanding soft drink consumption among male adolescents using the theory of planned behavior.

This study identified factors that influence regular soda consumption among 564 male students, aged 13-18 years, attending North Los Angeles County public high schools. Participants completed a group-administered Theory of Planned Behavior based questionnaire. Almost all of the participants, 96.5%, reported that they currently drink soda, 60.2% reported drinking two glasses of soda or more per day during the past year. Students reported drinking regular soda more than diet soda and reported drinking phosphoric acid containing soda (cola) more than nonphosphoric acid containing soda (noncola). Attitude, subjective norm, and perceived behavioral control were significant predictors of intention to drink regular soda and together explained 61% of its variance. Our results suggest that parents, teachers/coaches, and health professionals should encourage the perception that there are other healthier drinks that quench thirst better than soft drinks and taste good, and that soda should not be excessively available at home.