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Appetite. 2010 Apr;54(2):406-9. doi: 10.1016/j.appet.2010.01.003. Epub 2010 Jan 15.

L-theanine and caffeine improve task switching but not intersensory attention or subjective alertness.

Author information

  • 1Sensation, Perception & Behaviour, Unilever R&D Vlaardingen, Vlaardingen, The Netherlands. Suzanne.Einother@Unilever.com

Abstract

Tea ingredients L-theanine and caffeine have repeatedly been shown to deliver unique cognitive benefits when consumed in combination. The current randomized, placebo-controlled, double-blind, cross-over study compared a combination of L-theanine (97 mg) and caffeine (40 mg) to a placebo on two attention tasks and a self-report questionnaire before, and 10 and 60 min after consumption. The combination of L-theanine and caffeine significantly improved attention on a switch task as compared to the placebo, while subjective alertness and intersensory attention were not improved significantly. The results support previous evidence that L-theanine and caffeine in combination can improve attention.

Copyright 2010 Elsevier Ltd. All rights reserved.

PMID:
20079786
[PubMed - indexed for MEDLINE]
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