Can tea still be consumed after its expiration date?

If tea leaves have passed their shelf life without mold or odor, they can usually be consumed, but their flavor and nutritional value may decrease. The shelf life of tea is mainly affected by factors such as variety, storage conditions, and packaging methods. Green tea, yellow tea and other unfermented teas have a short shelf life, and after exceeding the shelf life, they are prone to oxidation and deterioration, resulting in darkening of color and dissipation of aroma. Even if this type of tea is not moldy, its taste will significantly deteriorate after brewing, and the tea soup will become cloudy and lose its freshness. Half fermented and fully fermented teas such as oolong tea and black tea have a relatively long shelf life. If stored properly in a dry and dark environment, they may still maintain good quality even after several months beyond their shelf life. Black tea, white tea and other post fermented teas have aging characteristics, and storing them under suitable conditions for many years can actually improve their quality, but attention should be paid to moisture and odor prevention. Vacuum packaged tea leaves have a longer shelf life and should be consumed as soon as possible after opening. Loose tea leaves are prone to moisture absorption and odor absorption, and there is a higher risk of spoilage after the expiration date. Tea stored in sealed containers such as metal cans and ceramic cans is more durable than paper packaging. Tea stored in humid areas of the south is more prone to premature deterioration. If tea is found to have clumped, moldy spots, or an oily taste, it should not be consumed further.

It is recommended to store tea leaves in a cool and dry place, avoiding direct sunlight and high temperature environments. Mixing different varieties of tea may cause cross flavors, so seal the tea promptly after each serving. Before drinking, check the appearance and odor of the tea leaves. If there are suspended solids in the tea soup or if the body does not adapt after drinking, stop immediately. Elderly people and those with gastrointestinal sensitivity should be cautious when drinking expired tea, and can choose new tea within its shelf life to obtain better flavor and nutrition.