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Meal timing alterations may prevent mood vulnerability in night shift workers
A recent study found that alterations made in meal timings can prevent mood vulnerability in shift workers. The study was published in the journal The Proceedings of the National Academy of Sciences.
There is a 25 to 40% increased risk of developing depression and anxiety in shift workers due to a misalignment between the central circadian clock and daily environmental/behavioral cycles. These misaligned cycles may negatively affect mood and emotional well-being as impaired glycemic control is a risk factor for mood disruption. As the evidence-based circadian interventions to prevent mood vulnerability in shift work settings are lacking, researchers conducted a study to assess mood vulnerability during simulated night work with either daytime and nighttime or daytime-only eating as compared with simulated day work as the baseline.
A parallel-design randomized clinical trial using a strictly controlled 14-d circadian laboratory protocol on healthy participants was carried out. Participants were randomized into two groups and underwent a forced desynchrony (FD) protocol in dim light for 4 "days" of 28 h, such that each 28-h FD day resulted in an additional 4-h misalignment between the central circadian clock and external behavioral/environmental cycles. The daytime and nighttime meal control (DNMC) group participants had a typical 28-h FD protocol, with behavioral and environmental cycles scheduled on a 28-h cycle, including the fasting/eating cycle, resulting in meals occurring during both the daytime and nighttime. In the daytime-only meal intervention (DMI) group, participants underwent a modified 28-h FD protocol with behavioral/environmental cycles scheduled on a 28-h cycle except for the fasting/eating cycle, which was scheduled on a 24-h cycle, thus resulting in meals consumed only during the daytime. Using computerized visual analog scales, depression-like and anxiety-like mood states were assessed.
Key findings:
- Depression-like mood levels were increased by 26.2% and anxiety-like mood levels by 16.1% compared to baseline in simulated night work with daytime and nighttime eating.
- There was no increase in anxiety-/depression-like mood levels with simulated night work in the daytime-only eating group.
- A larger degree of internal circadian misalignment was robustly associated with more depression-like and anxiety-like mood levels during simulated night work.
Thus, by this study, the researchers offered a proof-of-concept demonstration of an evidence-based meal timing intervention that may prevent mood vulnerability in shift work settings.
To read the full article, click here: https://doi.org/10.1073/pnas.2206348119
Qian J, Vujovic N, Nguyen H, et al. Daytime eating prevents mood vulnerability in night work. Proc Natl Acad Sci U S A. 2022;119(38):e2206348119.
BDS, MDS
Dr.Niharika Harsha B (BDS,MDS) completed her BDS from Govt Dental College, Hyderabad and MDS from Dr.NTR University of health sciences(Now Kaloji Rao University). She has 4 years of private dental practice and worked for 2 years as Consultant Oral Radiologist at a Dental Imaging Centre in Hyderabad. She worked as Research Assistant and scientific writer in the development of Oral Anti cancer screening device with her seniors. She has a deep intriguing wish in writing highly engaging, captivating and informative medical content for a wider audience. She can be contacted at editorial@medicaldialogues.in.
Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751