A participatory worker voice intervention (Health and Well-Being Committee) reduced psychological distress at 6-month follow-up among warehouse fulfillment center workers, with effects particularly pronounced among men, though differences were not significant at 12-month follow-up.
At baseline, a majority of fulfillment center workers reported clinically meaningful levels of psychological distress.
The Health and Well-Being Committee intervention was associated with lower psychological distress at 6-month follow-up compared to control sites.
The intervention effect on psychological distress was not maintained at 12-month follow-up.
The Health and Well-Being Committee intervention was particularly effective in reducing psychological distress among men at 6-month follow-up.
The participatory intervention involved the creation of peer committees tasked with identifying solutions to worker concerns.
The study provides experimental evidence that worker voice interventions can support mental health among low-wage US populations.
This research examined whether giving warehouse workers more of a say in their workplace could improve their mental health. The study was conducted across 16 fulfillment centers (large warehouses) across the United States from 2021 to 2023. Half of the sites set up a new 'Health and Well-Being Committee' where workers could raise concerns and peers worked together to find solutions. Nearly 2,800 workers completed surveys at the start of the study and at 6 and 12 months later. A striking finding was that more than half of all workers reported moderate or severe psychological distress at the beginning of the study, highlighting how mentally taxing this type of work can be. The research found that after 6 months, workers at sites with the new committee reported lower psychological distress compared to workers at sites without it. When the researchers looked at effects by gender, the benefit was especially notable for men. However, these differences were no longer statistically significant by the 12-month mark, raising questions about whether the benefits fade over time or whether additional support is needed to sustain improvements. This research suggests that giving low-wage workers structured opportunities to voice concerns and participate in problem-solving at their workplaces may be a meaningful way to support their mental health — at least in the short term. As warehouse and fulfillment center work has grown rapidly in the United States, findings like these could have practical implications for how employers and policymakers approach worker well-being programs. The study is notable because it used a rigorous randomized trial design, which provides stronger evidence for cause-and-effect than most workplace wellness research.
Siebach K, Díaz-Linhart Y, Kubzansky L, Berkman L, Wang M, Ge L, et al.. (2026). Effectiveness of a Participatory Voice Intervention on Psychological Well-Being Among Warehouse Workers: Results From the Fulfillment Center Intervention Study, United States, 2021‒2023.. American journal of public health. https://doi.org/10.2105/AJPH.2025.308352