<p>In the current study, we examined the effects of employees’ illegitimate tasks experience on their own unhealthy eating behaviors after work and their spouses’ unhealthy eating behaviors via negative affect, as well as the moderating role of coworker support. We collected data from 199 married couples over three waves with six-week intervals. Results showed that illegitimate tasks positively predicted employees’ unhealthy eating behavior after work, and negative affect mediated this relationship. Moreover, we found employees’ unhealthy eating was positively associated with their spouses’ unhealthy eating, and that employees’ illegitimate tasks had an indirect effect on their spouses’ unhealthy eating via their negative affect and unhealthy eating. We also found that the positive effect of illegitimate tasks on employees’ negative affect was weaker for those perceiving to have more coworker support, suggesting that support from colleagues may mitigate the effect of illegitimate tasks on focal employees’ negative affect and subsequent outcomes. Findings of the current study contribute to the understanding of whether and how illegitimate tasks may have a spillover effect on employee nonwork outcomes that can cross over to their spouses.</p>