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There’s evidence the effects of caffeine in a cup of tea are enhanced by an amino acid it contains, called L-theanine, if it is drunk regularly. The research finds “L-theanine may interact...
- Overview
- Most caffeinated teas
- Top healthy teas with no caffeine
- Caffeine risks
- Summary
Amounts of caffeine vary between teas, with black tea containing the most caffeine. Green and white teas contain the least, except for noncaffeinated teas.
Tea is one of the most popular beverages in the world. It consists of the leaves of the Camellia sinensis plant, which, after harvesting, begin to wilt and oxidize. A person can stop the oxidization process by heating the leaves.
The more tea leaves oxidize, the darker they become, which determines the type of tea:
•Black tea leaves are bruised, wilted, rolled, and completely oxidized.
•Green tea leaves are not wilted and are not oxidized.
•Oolong tea leaves are bruised, wilted, and partially oxidized.
The amount of caffeine in a tea varies according to the type of tea.
The most caffeinated teas are black and oolong teas, with decaffeinated and herbal teas containing very little to trace amounts of caffeine.
Many teas offer various health benefits, as they contain:
•Antioxidants: These delay or prevent oxidative damage, which helps lower the risk of diseases such as heart disease and cancer.
•Phytochemicals: These plant compounds occur naturally. They may boost the immune system and play a role in lowering the risk of cancer and heart disease.
•Flavonoids: These are a type of polyphenolic phytochemicals and are also antioxidants.
Rooibos tea
This tea contains no caffeine. Research on animals suggests that rooibos supplements may help protect the liver from oxidative stress and may help lower blood pressure.
Hibiscus tea
Research suggests that hibiscus leaf extracts may offer antitumoral and antioxidant properties and may promote cardiovascular health and healthy blood pressure.
Chamomile tea
Chamomile tea may help improve sleep in people who experience insomnia. It may also lower cholesterol, improve cardiovascular health, and provide antioxidant protection.
Consuming too much caffeine can cause health problems. The Food and Drug Administration (FDA) has cited 400 milligrams — about 4 or 5 cups of coffee — as the maximum recommended amount per day. However, consuming more than this has links to dangerous, negative effects, including:
•insomnia
•headaches
•anxiety
•restlessness
•increased heart rate
The most caffeinated teas include black, oolong, green, and white teas. These all have potential health benefits, as they contain antioxidants, polyphenols, flavonoids, flavonols, and other health-promoting compounds.
Health benefits of tea include:
•cardiovascular health due to lower cholesterol
•weight loss
•antioxidant protection
•protection from the effects of harmful UV rays
Jun 28, 2024 · Black tea is the classic go-to for a caffeine fix. It offers a strong flavor along with a considerable caffeine boost. Depending on the specific variety and brewing time, black tea can have almost as much caffeine as a cup of coffee. Popular black teas like English Breakfast and Earl Grey are staples for those who prefer a strong start to their ...
Apr 26, 2022 · Check the charts for an idea of the caffeine content in popular beverages. Drink sizes are in fluid ounces (oz.) and milliliters (mL). Caffeine is shown in milligrams (mg). Keep in mind that the actual caffeine content of a cup of coffee or tea can vary quite a bit.
Feb 3, 2023 · Bottom line. While black tea, espresso, and coffee bring the most caffeine to the table, green tea packs a moderate amount as well. The content in white teas varies greatly, while herbal...
Sep 6, 2019 · If you’re highly sensitive to caffeine, tea may be a better choice. It contains L-theanine, an amino acid with calming properties that may relax you while keeping you alert.
Sep 25, 2023 · Because of its high caffeine content, coffee may give you a quicker burst of energy, but tea contains L-theanine, a chemical that, in combination with caffeine, can help you stay mentally alert...
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