Effects of Diet on Sleep: A Narrative Review.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing published literature without formal systematic review or meta-analytic methodology.
PubMed 32230944 · doi:10.3390/nu12040936
What was done
The authors conducted a narrative review of literature identified through Cochrane, MEDLINE (PubMed), and CINAHL database searches up to August 2019 using the PICO framework. The review examined the effects of diet, specific foods, and nutrients on sleep outcomes in healthy adults, grouping eligible studies into four themes: tryptophan consumption and depletion, dietary supplements, whole food items, and macronutrients.
What was found
The abstract reports no numerical data, effect sizes, or sample sizes. Qualitatively, it reports that high-carbohydrate diets and intake of foods containing tryptophan, melatonin, and phytonutrients (such as cherries) were linked to improved sleep outcomes, potentially mediated by changes in serotonin and melatonin activity.
Why it matters
This review aggregates dietary factors that may support sleep quality in healthy non-clinical populations, where research has historically focused on the reverse relationship (how sleep deprivation impacts food intake).
Limits
The abstract provides no quantitative metrics, effect sizes, or confidence intervals. As a narrative review rather than a systematic review or meta-analysis, study quality and risk of bias were not systematically assessed, and the total number of included studies is unspecified.
Cited by
- supports Consuming evening carbohydrates triggers a serotonin and melatonin response.