Objective: Self-regulation can help individuals cope during stressful events, but little is known about why and when this might occur. We examined if being more focused on prevention was linked to negative affective experiences during the COVID-19 pandemic. We also examined possible underlying mechanisms for this association, and whether social support buffered it. Design: Pre-registered longitudinal study, with surveys every two weeks over one month (N = 1,269). Main outcome measures: Regulatory focus and worry for health (T1), adherence to self isolation and preventive health behaviors (T2), negative affective experiences, positive affect, frequency of online interactions, and perceived social support (T3). Results: Prevention focus was associated with health worries at baseline and linked to greater adherence to preventive health behaviors (T2). Only adherence to self-isolation was linked to more negative affective experiences (T3). Exploratory analyses showed that prevention focus was linked to more negative affective experiences (T3), but only for participants with fewer online interactions with their family and less perceived social support from family and friends. Conclusions: Prevention motives in threatening times can be a double-edged sword, with benefits for health behaviors and consequences for negative affective experiences. Having a strong social network during these times can alleviate these consequences.

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COVID-19,Regulatory focus,Prevention focus,Loneliness,Health behaviours,Negative affect,Social support

• Psychology - Social Sciences