Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis.

@article{Camfield2014AcuteEO,
  title={Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis.},
  author={D. Camfield and C. Stough and Jon Farrimond and A. Scholey},
  journal={Nutrition reviews},
  year={2014},
  volume={72 8},
  pages={
          507-22
        }
}
A systematic review and meta-analysis was conducted on 11 randomized placebo-controlled human studies of acute effects of tea constituents L-theanine and epigallocatechin gallate, administered alone or in combination with caffeine, on cognitive function and mood. [...] Key Method The outcome measures of mood were alertness, calmness, and contentedness, derived from the Bond-Lader scales, and state anxiety, from the State-Trait Anxiety Inventory.Expand
A double-blind, placebo-controlled study evaluating the effects of caffeine and L-theanine both alone and in combination on cerebral blood flow, cognition and mood
TLDR
Combining L-theanine with caffeine, at levels and ratios equivalent to one to two cups of tea, eliminated the vasoconstrictive effect and behavioural effects of caffeine and supports previous findings of an interaction between these substances, despite a lack of effects of L- theanine in isolation. Expand
The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review
TLDR
It is suggested 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. Expand
Acute effects of theanine, caffeine and theanine–caffeine combination on attention
TLDR
A dose of theanine equivalent of eight cups of back tea improves cognitive and neurophysiological measures of selective attention, to a degree that is comparable with that of caffeine. Expand
Anti-Stress, Behavioural and Magnetoencephalography Effects of an l-Theanine-Based Nutrient Drink: A Randomised, Double-Blind, Placebo-Controlled, Crossover Trial
TLDR
The effects of an l-theanine-based nutrient drink on mood responses to a cognitive stressor and resting state alpha oscillatory activity support the anti-stress effects of l- theanine. Expand
An intervention study on the effect of matcha tea, in drink and snack bar formats, on mood and cognitive performance.
TLDR
It is suggested that matcha tea consumed in a realistic dose can induce slight effects on speed of attention and episodic secondary memory to a low degree. Expand
The Acute Effects of caffeine and L-theanine on Cognition in Older Adults
TLDR
Although not statistically significant, Trails B and the Stroop Color Word test showed a decrease in time to complete each test, suggesting that caffeine and L-theanine could affect cognition. Expand
Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial
TLDR
It is suggested that L-theanine has the potential to promote mental health in the general population with stress-related ailments and cognitive impairments. Expand
Effects of l-theanine–caffeine combination on sustained attention and inhibitory control among children with ADHD: a proof-of-concept neuroimaging RCT
We examined the acute effects of l-theanine, caffeine and their combination on sustained attention, inhibitory control and overall cognition in boys with attention deficit hyperactivity disorderExpand
Sugar rush or sugar crash? A meta-analysis of carbohydrate effects on mood
TLDR
Findings challenge the idea that CHOs can improve mood, and might be used to increase the public's awareness that the 'sugar rush' is a myth, inform health policies to decrease sugar consumption, and promote healthier alternatives. Expand
Running head: CARBOHYDRATES AND MOOD
The effect of carbohydrate (CHO) consumption on mood is much debated, with researchers reporting both mood improvements and decrements following CHO ingestion. As global consumption ofExpand
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References

SHOWING 1-10 OF 39 REFERENCES
The effects of l-theanine, caffeine and their combination on cognition and mood
TLDR
The results suggest that beverages containing L-theanine and caffeine may have a different pharmacological profile to those containing caffeine alone. Expand
The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
TLDR
The present results suggest that 97 mg of L-theanine in combination with 40 mg of caffeine helps to focus attention during a demanding cognitive task. Expand
Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together
TLDR
Evidence suggests that theanine is a physiologically and behaviourally active compound and, while it is unclear how its effects might explain perceived differences between tea and coffee, evidence suggests that it may be useful for reducing raised blood pressure. Expand
Acute neurocognitive effects of epigallocatechin gallate (EGCG)
TLDR
Green tea consumption is reported to have wide ranging beneficial health outcomes across epidemiological studies, which have been attributed to its flavonoid content, and the modulation of brain function due to EGCG is deserving of further controlled human studies. Expand
L-theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance.
TLDR
Electrophysiological results did not show increased differential biasing in phasic alpha across hemifields but showed lower overall tonic alpha power in the combined treatment, similar to previous findings at a larger dosage of L-theanine alone. Expand
l-Theanine reduces psychological and physiological stress responses
TLDR
The results showed that L-Theanine intake resulted in a reduction in the heart rate and salivary immunoglobulin A responses to an acute stress task relative to the placebo control condition. Expand
The acute effects of L‐theanine in comparison with alprazolam on anticipatory anxiety in humans
TLDR
It is suggested that while L‐ theanine may have some relaxing effects under resting conditions, neither L‐theanine not alprazolam demonstrate any acute anxiolytic effects under conditions of increased anxiety in the AA model. Expand
The combined effects of L-theanine and caffeine on cognitive performance and mood
TLDR
Caffeine and L-theanine in combination improved both speed and accuracy of performance of the attention-switching task and reduced susceptibility to distracting information in the memory task at both 60 min and 90 min. Expand
Effects of L-theanine on attention and reaction time response
TLDR
Results evidently demonstrated that l -theanine clearly has a pronounced effect on attention performance and reaction time response in normal healthy subjects prone to have high anxiety. Expand
Gender differences in tea, coffee, and cognitive decline in the elderly: the Cardiovascular Health Study.
Although caffeine can enhance cognitive function acutely, long-term effects of consumption of caffeine-containing beverages such as tea and coffee are uncertain. Data on 4,809 participants aged 65Expand
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