A 2026 cross-sectional study of 50 medical residents found that zinc intake was associated with longer deep sleep duration, while higher carbohydrate and fiber intake correlated with more nighttime awakenings. Frequent junk food consumption predicted longer total sleep but lower quality sleep with more light sleep stages. According to Gram Research analysis, dietary modifications—particularly increasing zinc-rich foods and reducing excess carbohydrates—may help night-shift workers improve sleep quality and architecture.
Medical residents working night shifts struggle with poor sleep due to long hours and irregular schedules. A new study of 50 doctors found that what they eat significantly impacts how well they sleep. Zinc-rich foods helped them get deeper, more restorative sleep, while eating too many carbs and junk food actually made their sleep worse by causing them to wake up more often during the night. The research suggests that simple changes to what night-shift doctors eat could help them sleep better and feel healthier at work.
Key Statistics
A 2026 cross-sectional study of 50 medical residents found that zinc intake was positively associated with deep sleep duration (correlation coefficient r = 0.434, p = 0.010), suggesting that adequate zinc consumption may support more restorative sleep in shift workers.
In the same study of 50 medical residents, higher total energy intake, carbohydrate intake, and dietary fiber intake were all positively associated with nocturnal awakenings (p values ranging from 0.010 to 0.030), indicating these nutrients may fragment sleep in night-shift workers.
A 2026 study of 50 medical residents found that more frequent junk food consumption independently predicted 19 additional minutes of total sleep duration and 13 additional minutes of light sleep duration, but this longer sleep was lower quality with more fragmentation.
Among 50 medical residents studied in 2026, no significant independent associations were found between lifestyle factors like exercise and overall sleep quality scores, suggesting that night-shift work may disrupt the typical relationship between physical activity and sleep.
The Quick Take
- What they studied: How the food medical residents eat and their exercise habits affect their sleep quality and the different stages of sleep they experience.
- Who participated: 50 medical residents (doctors in training) between ages 24-34 working at a hospital in Amman, Jordan, including those working night shifts.
- Key finding: Zinc intake was linked to longer deep sleep (the most restorative kind), but eating more carbs and fiber actually caused more nighttime awakenings, and eating junk food frequently was associated with longer total sleep but lower quality sleep.
- What it means for you: If you work night shifts or irregular hours, eating zinc-rich foods like nuts, seeds, and lean meats might help you sleep more deeply, while limiting processed foods and excess carbs could reduce sleep disruptions. However, this is a small study, so talk to a doctor before making major dietary changes.
The Research Details
Researchers recruited 50 medical residents and tracked their eating habits for three days using food diaries. They measured exactly how much energy, carbohydrates, fiber, zinc, and magnesium each person ate. The doctors also wore special wristbands that tracked their sleep patterns, recording how long they slept, how much time they spent in light sleep versus deep sleep, and how many times they woke up at night. The researchers also asked the residents about their exercise levels and sleep quality using standard questionnaires.
This type of study is called “cross-sectional,” which means researchers took a snapshot of everyone at one point in time rather than following them over months or years. The researchers then used statistical analysis to find connections between what people ate and how they slept.
This research approach is important because it captures real-world data from actual doctors working real night shifts, not laboratory conditions. Using both food diaries and wearable sleep trackers gives a complete picture of both diet and actual sleep patterns. This combination helps researchers understand whether diet really affects sleep architecture (the different stages of sleep) or just how people feel about their sleep.
This study has some important limitations to understand: it’s relatively small (50 people), so the findings may not apply to all medical residents everywhere. The study only looked at data for three days, which may not represent typical patterns. The researchers measured correlation (things that happen together) but couldn’t prove that diet actually causes sleep changes. Additionally, medical residents have very stressful jobs with irregular schedules, so many factors beyond diet affect their sleep.
What the Results Show
The most striking finding was that zinc intake had a positive relationship with deep sleep duration. Residents who consumed more zinc had longer periods of deep sleep, which is the most restorative stage of sleep where your body repairs itself. This connection was statistically significant, meaning it’s unlikely to be due to chance.
Interestingly, eating more total calories, carbohydrates, and fiber was associated with more nighttime awakenings—meaning these residents woke up more frequently during the night. While these foods are generally healthy, the study suggests they may fragment sleep in this specific population of night-shift workers.
Another unexpected finding was that residents who ate junk food more frequently actually slept longer overall, but the quality of that sleep was poor—they spent more time in light sleep (the least restorative stage) rather than deep sleep. This suggests that while junk food might help you fall asleep or sleep longer, it doesn’t help you get the deep, restorative sleep your body needs.
The study found no significant connection between exercise levels and overall sleep quality scores. This was surprising because exercise is typically thought to improve sleep. However, the researchers note that night-shift work may disrupt the normal relationship between exercise and sleep that exists in people with regular schedules. The study also found that magnesium intake wasn’t significantly linked to sleep measures, though zinc was.
According to Gram Research analysis, this study adds important information to existing knowledge about shift work and sleep. Previous research has shown that night-shift workers generally have poor sleep quality, but few studies have examined specific nutrients and their effects on sleep architecture. This research aligns with general nutrition science showing that zinc supports sleep, but it’s one of the first to document this relationship in medical residents specifically. The finding about carbohydrates and fiber increasing nighttime awakenings is somewhat surprising and contradicts some general sleep advice, suggesting that night-shift workers may respond differently to nutrients than people with regular sleep schedules.
The study is small (only 50 residents), which limits how much we can generalize the findings to all medical residents. The three-day measurement period is short and may not capture typical eating and sleeping patterns. The study shows correlation (things that happen together) but cannot prove that diet causes sleep changes—other factors like stress, caffeine, or work schedule intensity could explain the connections. The study was conducted at one hospital in Jordan, so results may differ in other countries or healthcare settings. Additionally, medical residents’ extreme work schedules and stress levels make it hard to separate the effects of diet from the effects of their demanding jobs.
The Bottom Line
For night-shift workers, especially medical residents: Consider increasing zinc-rich foods like oysters, beef, pumpkin seeds, and chickpeas to potentially improve deep sleep quality (moderate confidence based on this small study). Limit excess carbohydrates and processed foods close to bedtime, as they may increase nighttime awakenings (moderate confidence). While junk food may help you sleep longer, it doesn’t improve sleep quality, so it’s not a good strategy (moderate confidence). These recommendations should be discussed with a healthcare provider, especially if you have existing sleep disorders or dietary restrictions.
This research is most relevant to medical residents and other shift workers who struggle with sleep. It may also apply to anyone working irregular hours or night shifts. People with normal sleep schedules may not see the same effects. If you have a diagnosed sleep disorder, talk to a sleep specialist before making dietary changes based on this research.
Changes to diet typically take 2-4 weeks to show effects on sleep patterns. You might notice improvements in how rested you feel within a few days, but significant changes to sleep architecture (the actual stages of sleep) usually take longer. Keep a sleep diary for at least two weeks while making dietary changes to see if you notice improvements.
Frequently Asked Questions
Does zinc really help you sleep better if you work night shifts?
Research from a 2026 study of 50 medical residents shows zinc intake was linked to longer deep sleep duration (r = 0.434). While this is promising, the study is small, so more research is needed. Zinc-rich foods like oysters, beef, and pumpkin seeds are worth trying, but consult a doctor first.
Why does eating carbs before bed make night-shift workers wake up more?
A 2026 study found that higher carbohydrate intake correlated with more nighttime awakenings among 50 medical residents (p = 0.014). The exact reason isn’t clear, but night-shift workers may process carbs differently than day workers. Individual responses vary, so track your own sleep patterns.
Is it okay to eat junk food if it helps me sleep longer?
A 2026 study of 50 residents found junk food increased total sleep time but decreased sleep quality, with more light sleep and less deep sleep. Longer sleep that’s low quality won’t leave you feeling rested. Better options include zinc-rich whole foods that support deep, restorative sleep.
What’s the best diet for medical residents working night shifts?
Based on a 2026 study of 50 residents, prioritize zinc-rich foods (oysters, beef, seeds), limit excess carbohydrates before sleep, and avoid junk food. However, this small study shows correlation, not causation. Work with a nutritionist familiar with shift work to create a personalized plan.
How long does it take for diet changes to improve night-shift sleep?
Most dietary changes take 2-4 weeks to noticeably affect sleep architecture. You might feel slightly more rested within days, but significant improvements in deep sleep duration typically require consistent dietary changes over several weeks of tracking.
Want to Apply This Research?
- Track daily zinc intake (target: 8-11 mg for adults) alongside sleep quality scores and deep sleep duration from a wearable device. Log zinc sources: oysters, beef, pumpkin seeds, chickpeas, and cashews.
- Set a reminder to eat one zinc-rich snack daily (handful of pumpkin seeds, small portion of nuts, or lean protein). Reduce processed carbohydrates in the 3 hours before sleep. Track how many times you wake up at night to see if changes correlate with dietary modifications.
- Use the app to log meals for 3-day periods monthly, paired with wearable sleep data. Create a custom dashboard showing zinc intake versus deep sleep duration and nocturnal awakenings. Compare monthly trends to identify which dietary patterns best support your sleep quality.
This research is a small cross-sectional study (50 participants) that shows correlation, not causation, between diet and sleep. Results may not apply to all populations or healthcare settings. Medical residents and shift workers should consult with their healthcare provider or a registered dietitian before making significant dietary changes, especially if they have existing sleep disorders, medical conditions, or take medications. This article is for educational purposes and should not replace professional medical advice. If you experience persistent sleep problems, consult a sleep medicine specialist.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.