We’ve all heard that tea is good for you but is there really any proof?
Recent studies have shown some of the effects of tea on brain function.A recent human study examined the effect of the unique tea amino acid L-theanine on attention related task performance. Task performance was measured by tracking electrical activity produced by the brain ( via EEG). The results suggest L-theanine plays a role in processing attention in synergy with caffeine. (1)
A published randomized human clinical trial found that subjects given a daily supplement with green tea extract and L-theanine extracted from tea experienced improvements in mild cognitive impairments (MCI). (2)
Caffeine and L-theanine in tea may offer cognitive benefits and improve mental clarity and work performance. A cross-sectional study showed that participants who consumed more tea felt less tired and reported higher levels of subjective work performance. (3)
A double-blind, placebo controlled crossover study showed that the flavonoid EGCG (found in green tea) was associated with a significant increase in self-rated calmness and reduced self rated stress. This is in keeping with the widespread consumption of green tea for its purported relaxing/refreshing properties.
1. Kelly SP, Gomez-Ramirez M, Montesi JL, Foxe JJ. L-Theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance. J Nutr 2008;138:1572S–7S. 2. De Bruin EA, Rowson MJ, Van Buren L, Rycroft, JA, Owen GN. Black tea improves attention and self-reported alertness. 2011. Appetite, 56: 235-240. 3. Bryan J, Tuckey, M, Einöther S.J.L. et al. The relationship between tea and other beverage consumption, work performance and mood. Appetite, 2012. 58 (1), 339–346 4. Scholey A; Downey LA; Ciorciari J; Pipingas A; Nolidin K; Finn M; Wines M; Catchlove S; Terrens A; Barlow E; Gordon L; Stough C Acute neurocognitive effects of epigallocatechin gallate (EGCG). Appetite. 58(2):767-70, 2012 Apr.