Journal of Epidemiology · Nov 7, 2026

Association of Matcha Tea with Cognitive Function: A Systematic Review and Meta-Analysis

By Huang MH, Fan HY, Jen PL et al.

Background: Cognitive decline may occur across the adult lifespan, particularly with aging, and may adversely affect daily functioning. Matcha, a powdered Japanese green tea rich in bioactive compounds, has been suggested to benefit cognitive function; however, current evidence remains limited and inconsistent. This systematic review and meta-analysis aimed to evaluate the effects of matcha consumption on cognitive function.Methods: A systematic search was conducted in PubMed, Embase, the Cochrane library, and Web of Science from inception to April 13, 2026. Randomized controlled trials (RCTs) evaluating repeated matcha consumption in adults aged ≥18 years without a clinical diagnosis of dementia were included. A descriptive synthesis was performed, and where appropriate, exploratory meta-analyses were conducted using random-effects models to estimate standardized mean differences with 95% confidence intervals.Results: Four RCTs were included. Most studies showed no significant changes in global cognitive function assessed by the Montreal Cognitive Assessment (MoCA) or Mini-Mental State Examination (MMSE), although exploratory meta-analysis suggested a potential improvement in MoCA (SMD = 0.84; 95% CI, 0.04-1.64). In the descriptive synthesis, individual studies reported improvements in selected cognitive outcomes, including language performance, attentional function, social acuity, and emotion-related measures.Conclusion:Current evidence on the cognitive effects of matcha remains limited and inconclusive. Although potential benefits in specific domains have been observed, consistent improvements in global cognitive function are lacking.

doi.org/10.2188/jea.je20260229 Open access Powered by J-STAGE Interventions