Trial reportNutrients2017
Reduced Stress and Improved Sleep Quality Caused by Green Tea Are Associated with a Reduced Caffeine Content.
Trial report in Nutrients, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
35 citing papers in PubMed, 5 syntheses or guidelines pooled it, 64 citations in OpenAlex.
- Pooled it
- The Effect of Superficial Heat-Cold Application on the Sleep Quality of Patients With Restless Leg Syndrome: A Systematic Review and Meta-Analysis.Nursing open · 2024Pooled it
- The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review.International journal of molecular sciences · 2023Pooled it
- TFOS lifestyle: Impact of societal challenges on the ocular surface.The ocular surface · 2023Pooled it
- Potential of Polyphenols for Improving Sleep: A Preliminary Results from Review of Human Clinical Trials and Mechanistic Insights.Nutrients · 2023Pooled it
- Trial
- Matcha Does Not Affect Electroencephalography during Sleep but May Enhance Mental Well-Being: A Randomized Placebo-Controlled Clinical Trial.Nutrients · 2024Trial
- Trial
- Stress-Reducing Function of Matcha Green Tea in Animal Experiments and Clinical Trials.Nutrients · 2018Trial
- Effects of L-theanine on cognition, mood and sleep: evidence from human trials.Frontiers in nutrition · 2026Review
- Promising, but Not Completely Conclusive-The Effect of l-Theanine on Cognitive Performance Based on the Systematic Review and Meta-Analysis of Randomized Placebo-Controlled Clinical Trials.Journal of clinical medicine · 2025Review
- Associations of caffeine and caffeine metabolites with sex hormones among 6-19-year-old children and adolescents.Scientific reports · 2025Article
- Tea consumption, cardiovascular diseases risk factors, sleep and mental health status among diabetic women.Journal of diabetes and metabolic disorders · 2025Article
- Variation analysis and quantitative trait loci mapping of 16 free amino acid traits in the tea plant (Camellia sinensis).BMC plant biology · 2025Article
- Stress-Relieving Effects of Japanese Green Tea: Evaluation Using the Molar Ratio of Caffeine and Epigallocatechin Gallate to Theanine and Arginine as an Indicator.Foods (Basel, Switzerland) · 2025Article
- Associations between tea-drinking habits and health-related quality of life in Chinese adults: a mediation analysis based on sleep quality.International health · 2024Article
- Exploring the protective role of green tea extract against cardiovascular alterations induced by chronic REM sleep deprivation via modulation of inflammation and oxidative stress.BMC complementary medicine and therapies · 2024Article
- Stress-Relieving Effects of Green Tea Depend on the Ratio of Its Special Ingredients and the Infusion Conditions.Molecules (Basel, Switzerland) · 2024Article
- Association between coffee and tea consumption and the risk of dementia in individuals with hypertension: a prospective cohort study.Scientific reports · 2024Article
- Polyphenols: Natural Food-Grade Biomolecules for the Treatment of Nervous System Diseases from a Multi-Target Perspective.Pharmaceuticals (Basel, Switzerland) · 2024Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Caffeine, one of the main components in green tea, can interfere with sleep and block the effect of theanine. Since theanine, the main amino acid in tea leaves, has significant anti-stress effects in animals and humans, we examined the effects of green tea with lowered caffeine content, i.e., low-caffeine green tea (LCGT), on stress and quality of sleep of middle-aged individuals (
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.