The rise of e-commerce has led to substantial changes in personal travel and activities. We systematically reviewed empirical studies on the relationship between online shopping and personal travel behaviour. We synthesised and assessed the evidence for four types of effects on various travel outcomes, including trip frequency, travel distance, trip chaining, mode choice, and time use. In 42 articles reviewed, we found more evidence that online shopping substitutes for shopping travel. Most studies to date have focused on trip frequency but neglected other travel outcomes. Very few studies have considered the modification effect, which has significant implications for travel demand management. In sum, previous studies have not reached a consensus on the dominant effect of online shopping, in part due to the diversity in variable measurements, types of goods, study areas, and analytic methods. A limitation of previous studies is the reliance on cross-sectional surveys, which hinders the distinction between short-and long-term behaviours and between modification, complementarity, and substitution effects. Our study provides an agenda for future research on this topic and discusses policy implications related to land use, behavioural changes, data collection, and modelling for practitioners who wish to incorporate e-commerce in planning for sustainable urban systems.

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Background COVID-19 has impacted mental health globally, however, associations between anxiety and appetitive traits during the pandemic are unreported. This study evaluated anxiety symptom severity and associations with appetitive traits in students at a large public University in the U.S. during the pandemic. Methods Current undergraduate and graduate/professional students completed a cross-sectional survey in fall 2020. Demographic information, anxiety symptoms in the past 2 weeks assessed by the Generalized Anxiety Disorder Scale (GAD-7), and appetitive traits assessed by the Adult Eating Behavior Questionnaire (AEBQ) were evaluated. Mean scores for eight AEBQ scales (four food approach and four food avoidance traits) were calculated. Differences in mean scores were examined between participants with moderate to severe anxiety symptoms (GAD-7 score ≥ 10) and those with mild to no anxiety symptoms (GAD-7 score < 10) via independent samples t-tests and effect sizes. Associations between GAD-7 score and individual appetitive traits were also examined, adjusting for age and gender. Results Of the 1243 students who completed the survey (57% undergraduates; mean age = 26.5 years), 51.9% reported moderate to severe anxiety symptoms. Groups experiencing the highest degree of moderate to severe anxiety symptoms included transgender, gender fluid, and other-gendered participants (73.6%); the youngest age group [18–20 years (62%)]; undergraduate students (60.7%); and Hispanic/Latinx participants (57.7%). Participants with moderate to severe anxiety symptoms had higher scores for most food approach and avoidance traits but lower scores for enjoyment of food than those with mild to no anxiety symptoms. Effect sizes were largest for hunger and emotional over-eating (Cohen’s d = 0.31 and 0.30, respectively). Adjusting for age and gender, GAD-7 score was significantly and positively associated with hunger, emotional over-eating, food and satiety responsiveness, and food fussiness and negatively associated with enjoyment of food. Conclusions Over half of students at a U.S. University reported moderate to severe anxiety symptoms during COVID-19. More severe anxiety symptoms were associated with increased hunger, emotional over-eating, and food and satiety responsiveness and decreased enjoyment of food. Universities must consider strategies to address anxiety, particularly in younger students; transgender, gender fluid, and students of other genders; and across race/ethnicities keeping in mind associations with appetitive traits.

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