Japanese tea glossary
Umami
Short answer: umami is one of the five basic tastes, alongside sweet, sour, salty and bitter. In green tea it is notably associated with amino acids such as theanine and glutamate. It is neither an aroma nor a health benefit.
Umami, bitterness and astringency
Umami does not mean “salty”. The word “savoury” can help but remains an approximation. In tea, umami should be distinguished from bitterness and astringency. Caffeine contributes bitterness, while catechins contribute mainly to astringency.
Perceived intensity depends on cultivar, harvest, shading, processing and brewing. Japan’s Ministry of Agriculture explains that shading limits some light-related transformations and supports a profile richer in theanine and umami.
Effect of water temperature
Cooler water does not create more umami in the leaf. It extracts some bitter and astringent compounds more slowly, which can make umami easier to perceive. Hotter brewing often produces a brisker and more bitter profile. The same tea can therefore taste significantly different when dose, temperature or infusion time changes.
Strong umami is not automatic proof of quality, origin or nutritional value. The presence of theanine or glutamate should not be turned into a medical promise.
Institutional sources
- MAFF, theanine, shading and umami
- MAFF, the five basic tastes
- Umami Information Center, green tea compounds
Sources checked 13 July 2026.
Continue reading
Last review
Definition checked 13 July 2026.