Lower income is associated with greater stress, and stress has been shown to undermine treatment engagement and weight loss outcomes in face-to-face interventions. The present study examined whether lower income predicts treatment engagement and weight loss outcomes during an online behavioral weight loss (BWL) intervention. A total of N = 260 participants (79.2% female; 50.7 ± 11.9 years of age; 60.3% non-Hispanic White) were enrolled into an online BWL program and had their income, stress, program engagement, and weight measured. Results showed that stress fully mediated the effect of income on engagement in the online program. Further, lower income predicted poorer weight loss outcomes, and this effect was partially mediated by perceived stress. This is the first study to demonstrate that lower income is associated with poorer engagement and weight loss outcomes in an online weight loss program, underscoring the need for systems-level stress reduction programs and individual level stress management tools, particularly for individuals with lower income.

较低的收入与更大的压力有关，而压力已被证明会破坏面对面干预中的治疗参与和减肥效果。本研究检查了在在线行为减肥 (BWL) 干预期间，较低的收入是否可以预测治疗参与和减肥结果。共有 N = 260 名参与者（79.2% 女性；50.7 ± 11.9 岁；60.3% 非西班牙裔白人）参加了在线 BWL 计划，并测量了他们的收入、压力、计划参与度和体重。结果表明，压力完全中介了收入对在线课程参与度的影响。此外，较低的收入预示着较差的减肥效果，这种影响部分是由感知压力介导的。