The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels

a Systematic Review

Jackson L Williams, Julian M Everett, Nathan M D'Cunha, Domenico Sergi, Ekavi N Georgousopoulou, Richard J Keegan, Andrew J McKune, Duane D Mellor, Nicola Anstice, Nenad Naumovski

Research output: Contribution to journalSystematic Review

1 Citation (Scopus)

Abstract

The green tea amino acid, L-theanine (L-THE) is associated with several health benefits, including improvements in mood, cognition and a reduction of stress and anxiety-like symptoms. This systematic review evaluated the effect of pure L-THE intake, in the form of orally administered nutritional supplements, on stress responses and anxiety levels in human randomised controlled trials. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist, 9 peer-reviewed journal articles were identified where L-THE as a supplement was compared to a control. Our findings suggest that supplementation of 200-400 mg/day of L-THE may assist in the reduction of stress and anxiety in people exposed to stressful conditions. Despite this finding, longer-term and larger cohort clinical studies, including those where L-THE is incorporated into the diet regularly, are needed to clinically justify the use of L-THE as a therapeutic agent to reduce stress and anxiety in people exposed to stressful conditions.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalQualitas Plantarum Plant Foods for Human Nutrition
DOIs
Publication statusE-pub ahead of print - 22 Nov 2019

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theanine
Aptitude
systematic review
green tea
Tea
anxiety
Anxiety
Amino Acids
amino acids
Nutrition
Insurance Benefits
peers
emotions
Checklist
cognition
Health
Cognition
signs and symptoms (animals and humans)
dietary supplements
Meta-Analysis

Cite this

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title = "The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review",
abstract = "The green tea amino acid, L-theanine (L-THE) is associated with several health benefits, including improvements in mood, cognition and a reduction of stress and anxiety-like symptoms. This systematic review evaluated the effect of pure L-THE intake, in the form of orally administered nutritional supplements, on stress responses and anxiety levels in human randomised controlled trials. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist, 9 peer-reviewed journal articles were identified where L-THE as a supplement was compared to a control. Our findings suggest that supplementation of 200-400 mg/day of L-THE may assist in the reduction of stress and anxiety in people exposed to stressful conditions. Despite this finding, longer-term and larger cohort clinical studies, including those where L-THE is incorporated into the diet regularly, are needed to clinically justify the use of L-THE as a therapeutic agent to reduce stress and anxiety in people exposed to stressful conditions.",
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The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels : a Systematic Review. / Williams, Jackson L; Everett, Julian M; D'Cunha, Nathan M; Sergi, Domenico; Georgousopoulou, Ekavi N; Keegan, Richard J; McKune, Andrew J; Mellor, Duane D; Anstice, Nicola; Naumovski, Nenad.

In: Qualitas Plantarum Plant Foods for Human Nutrition, 22.11.2019, p. 1-12.

Research output: Contribution to journalSystematic Review

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AU - Williams, Jackson L

AU - Everett, Julian M

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AU - Sergi, Domenico

AU - Georgousopoulou, Ekavi N

AU - Keegan, Richard J

AU - McKune, Andrew J

AU - Mellor, Duane D

AU - Anstice, Nicola

AU - Naumovski, Nenad

PY - 2019/11/22

Y1 - 2019/11/22

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