The Relationship between Diet Quality, Sleep Quality, and Shiftwork in Clinical and Non-Clinical Healthcare Workers Participating in Cohort Study of Shiraz University of Medical Sciences Employees, Shiraz, Iran

Document Type : Original Article

Authors

1 Nutrition Research Center, Shiraz University of Medical Sciences, Shiraz, Iran

2 Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

3 Gastroenterohepatology Research Center, Department of Clinical Nutrition, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

4 Center for Cohort Study of Shiraz University of Medical Sciences Employees, Shiraz University of Medical Sciences, Shiraz, Iran

5 Department of Biostatistics, Shiraz University of Medical Sciences, Shiraz, Iran

6 Student Research Committee, School of Nutrition and Food Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

10.30476/ijns.2025.106462.1444

Abstract

Background: Since little is known about the correlation between dietary habits and sleep quality in healthcare professionals, the current study was performed to determine the relationship between diet quality, sleep quality, and shiftwork in clinical and non-clinical healthcare workers participating in Cohort Study of Shiraz University of Medical Sciences Employees, Shiraz, Iran.
Methods: In a cross-sectional preliminary research, data of 3375 participants from Shiraz University of Medical Sciences Employees Health Cohort Study (SUMS EHCS) were enrolled. The work schedules of participant were classified into fixed and rotating shifts. Sleep quality and dietary intake were evaluated using the Pittsburgh Sleep Quality Questionnaire (PSQI) and a food frequency questionnaire (FFQ). To assess dietary scores, we computed the healthy eating index (HEI) and dietary diversity score (DDS).
Results: Among participants, 75% were engaged in fixed shiftwork, while 25% were involved in rotating shiftwork. Notably, 34% of clinical occupational group were on rotating shifts when compared to 20% of nonclinical occupational group (p<0.0001). After adjusting for confounding factors, non-clinical healthcare workers demonstrated a higher DDS score, but poorer sleep quality compared to clinical healthcare workers (p< 0.0001 and p<0.0001, respectively). Additionally, years of employment were associated with higher HEI scores and diminished sleep quality (p<0.05).
Conclusion: Our study indicated that non-clinical healthcare personnel exhibited higher DDS scores; while simultaneously experiencing lower sleep quality compared to their clinical colleagues. Furthermore, the duration of employment was linked to elevated HEI scores and reduced sleep quality.

Highlights

Seyed Jalil Masoumi (Google Scholar)

Zahra Mousavi Shirazi-Fard (Google Scholar)

Keywords

References

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International Journal of Nutrition Sciences
Volume 10, Issue 4 - Serial Number 4
December 2025
Pages 666-675

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