Dietary Influences on Sleep Quality and Duration

Diet exerts a multifaceted influence on both the quality and the duration of sleep, operating through nutritional composition, timing of consumption and bioactive compounds. Macronutrient balance—particularly the relative proportions of protein, carbohydrate and fat—modulates nocturnal sleep by altering the synthesis of sleep‐promoting neurotransmitters. Protein sources rich in tryptophan support serotonin and melatonin production, while high-glycaemic‐index carbohydrates can shorten sleep latency. Dietary fibre has been linked to deeper slow-wave sleep, whereas excessive saturated fat and high sodium intake tend to fragment sleep and reduce total sleep time. Micronutrients such as magnesium, zinc and B vitamins serve as cofactors in melatonin synthesis and neurochemical regulation, further shaping sleep architecture. Inflammatory properties of the diet, assessed by indices of dietary inflammation, correlate inversely with sleep quality, suggesting that anti-inflammatory dietary patterns may bolster restorative sleep. Well-established dietary models—of which the Mediterranean diet is most prominent—combine high fruit, vegetable, wholegrain and healthy fat intake with moderate protein and limited processed foods, collectively associated with superior sleep outcomes. Understanding these relationships bears global significance for non-pharmacological interventions, with implications for public health policy and personalised nutrition strategies aimed at mitigating sleep disturbance and its downstream cardiometabolic and cognitive risks.

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Dietary Influences on Sleep Quality and Duration publication trend

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Technical terms

Tryptophan: An essential amino acid precursor for serotonin and melatonin synthesis, influencing sleep initiation.

Melatonin: A nocturnally secreted hormone that regulates circadian rhythms and promotes sleep onset.

Glycaemic index: A ranking of carbohydrate foods by their effect on postprandial blood glucose levels, impacting sleep latency.

Sleep latency: The interval between lights-out and the onset of sleep, used as an indicator of sleep initiation efficiency.

Wake after sleep onset (WASO): Total time spent awake following initial sleep onset, reflecting sleep fragmentation.

Dietary inflammatory index: A score quantifying the inflammatory potential of a diet based on nutrient and food component intake.

References

1. Effects of Diet on Sleep: A Narrative Review. Nutrients (2020).
2. Dietary Inflammatory Index and Sleep Quality in Southern Italian Adults. Nutrients (2019).
3. Adherence to the Mediterranean Diet is Associated with Better Sleep Quality in Italian Adults. Nutrients (2019).
4. Exploring the Role of Dairy Products In Sleep Quality: From Population Studies to Mechanistic Evaluations. Advances in Nutrition (2023).
5. Relationship Among Macronutrients, Dietary Components, and Objective Sleep Variables Measured by Smartphone Apps: Real-World Cross-Sectional Study. Journal of Medical Internet Research (2025).
6. Diet, Sleep, and Mental Health: Insights from the UK Biobank Study. Nutrients (2021).