Zinc intake is positively associated with deep sleep duration in night-shift medical residents
In a cross-sectional study of 50 medical residents, zinc intake was positively correlated with deep sleep duration (r = 0.434, p = 0.010). This suggests that higher zinc consumption may be linked to increased deep sleep in this population.
Evidence Score
Study Evidence
Study 1. Dietary intake, lifestyle behaviors, and sleep architecture among night-shift medical residents: a cross-sectional study.
observationalRousan MY, Ghazzawi HA, Al Oweidat K, Alawamleh RA · Frontiers in nutrition (2026)
Result:
Mechanism Graph
Limitations
- ⚠Cross-sectional design prevents causal inference
- ⚠Small sample size (n=50) limits generalizability
- ⚠Dietary intake and sleep were self-reported or device-measured over only 3 days
Frequently Asked Questions
What was the main finding regarding zinc and sleep?▼
Zinc intake was positively associated with deep sleep duration (r = 0.434, p = 0.010) in medical residents.
How was sleep measured in this study?▼
Sleep parameters including deep sleep were measured using a wearable sleep-tracking device over 3 days.
Who were the participants in this study?▼
50 medical residents aged 24-34 years from Jordan University Hospital in Amman, Jordan.
What other dietary factors were linked to sleep?▼
Higher energy, carbohydrate, and fiber intake were associated with more nocturnal awakenings, and frequent junk food consumption predicted longer total sleep and light sleep duration.
Products
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References
- 1.Rousan MY, Ghazzawi HA, Al Oweidat K, Alawamleh RA. "Dietary intake, lifestyle behaviors, and sleep architecture among night-shift medical residents: a cross-sectional study.." Frontiers in nutrition, 2026. PMID: 42339357 DOI: 10.3389/fnut.2026.1851443