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Research has demonstrated that online courses present significant challenges for students' concentration. Among various impediments, eating and related thoughts emerged as major distractors. This study examined the dynamic relationship between eating activities and attention levels during a 12-week online course, investigating their impact on learning outcomes. Utilizing the parallel process model (PPM), which allows for the consideration of multiple trajectories simultaneously, the study found a negative correlation between eating activities and students' attention levels at the beginning of the course. Moreover, changes in eating activities negatively influenced attentiveness over time. Importantly, fluctuations in attention significantly affected final grades, with a statistically significant mediation effect. These findings highlight the importance of managing distractions to enhance online learning effectiveness.