And not all the science has been favorable to tea. A report in the March 1 edition of The New England Journal of Medicine looking at green tea consumption in humans, found no effect on stomach cancers once adjustments were made for other factors that could affect risk. Those other factors included sex, age, history of stomach ulcer, use of tobacco or alcohol, and other dietary habits.
"Drink tea if you enjoy it, in moderation, and not because you're taking it as a medicine," says Dr. Sesso. Stirring in a little sugar is fine, but if you add a few heaping teaspoons of sugar, you're probably canceling out tea's possible benefits, he notes. And beware of the sugar found in many bottled teas, some of which contain as much as nine teaspoons of sugar per serving—almost as much as colas and other soft drinks. Check bottled tea labels and choose only pure, unadulterated tea—or save money and brew your own at home.
Domestic Process: This is a very simple process. It involves repeated steeping of tea in hot water and the disposal of the water (you may use this tea to serve those who don’t mind having caffeinated tea). The more you repeat the process, the less caffeine there will be left in the tea, but the same is true of the taste and flavor. Basically, don’t overdo it. Two or three steepings are probably safe. After all, you do want tea and not plain, hot water, right?
Still, there have been some interesting findings. A 2014 study looked at 25 randomized controlled trials on the link between tea and blood pressure and reported that when people drank tea—especially green tea—for 12 weeks, their blood pressure dropped significantly. A 2011 study reported that drinking green tea appeared to be linked with lower levels of bad LDL cholesterol, but more research is needed. Because matcha is a type of green tea, they may share similar benefits, but there’s not enough research to make that claim.
• In skin cancer studies, lab animals that were given green tea developed 1/10th as many tumors as animals that were given water. The EGCC in green tea inhibits the production of urokinase, an enzyme that cancer cells need in order to grow. It also seems to stimulate the process of programmed cell death, or apoptosis, in cancer cells. Pair your green tea with these 30 foods that help prevent cancer.
According to science, matcha is something of a miracle supplement. For one, it makes you feel good. One recent study examined the effects of the phytochemicals in green tea on mood and cognition. The combo of caffeine (present in most green teas) and L-theanine, an amino acid found in some teas, were found to “improve performance in attention-switching tasks and alertness, but to a lesser extent than caffeine alone,” partly because of how L-theanine chills you out.
In response, the governor of Shizuoka Prefecture, Heita Kawakatsu, stated: "there is absolutely no problem when they [people] drink them because it will be diluted to about 10 becquerels per kilogram when they steep them even if the leaves have 1,000 becquerels per kilogram;" a statement backed by tests done in Shizuoka. Japanese Minister for Consumer Affairs and Food Safety Renhō stated on 3 June 2011 that "there are cases in which aracha [whole leaves of Japanese green tea] are sold as furikake [condiments sprinkled on rice] and so on and they are eaten as they are, therefore we think that it is important to inspect tea leaves including aracha from the viewpoint of consumers' safety."
Matcha powder and hot water should be whisked together. It’s recommended that you use a tea strainer to sift the matcha into a bowl to avoid clumps. Then, add warm water and whisk it. (Traditionally this is done with a called a bamboo whisk called a chasen.) The whisking creates a foamy tea that can be poured into your cup. Some people add the powder to other hot liquids, like milk, to make a bright green latte. Here’s a video of how to make traditional matcha tea.
A book written by Lu Yu in 600-900 AD (Tang Dynasty), "Tea Classic" (simplified Chinese: 茶经; traditional Chinese: 茶經; pinyin: chájīng), is considered important in green tea history. The Kissa Yojoki (喫茶養生記 Book of Tea), written by Zen priest Eisai in 1211, describes how drinking green tea may affect five vital organs, the shapes of tea plants, flowers and leaves, and how to grow and process tea leaves.
Heat or boil water, but don’t let it completely boil and become too hot, as this can destroy some of the delicate compounds found in green tea leaves. The “ideal” temperature for brewing green tea is between 160 degrees Fahrenheit to 180 degrees F (traditionally standard Chinese green teas brew at a slightly higher temperatures). Pour hot water into the teapot to steep the leaves for only about 1–3 minutes. Larger leaves need more time to steep than finer, smaller leaves. At this point you can also add any fresh herbs you plan on steeping.
If you do choose to try a tea detox, the most important aspect isn't the kind of healthy tea you choose—it’s what else you eat: “Tea can only be medicinal and detoxifying if your diet isn’t taxing your system, which most American meals are guilty of,” says Lagano. In order to truly detoxify your body, cut processed and fried foods, and up your intake of fruits, vegetables, whole grains, lean proteins, and anti-inflammatory fats like avocados and almonds, says Villacorta. Once your diet is clean and gentle on your body, detoxifying teas can begin to enhance your natural organ function.
You can make African red tea much like other herbal teas, according to Teavana. Add a 1 1/2 teaspoons of loose African red tea to make an 8-ounce serving, using boiling water. Allow the tea to steep for roughly five to six minutes, longer if you wish for a stronger tasting tea. Letting the tea steep for longer will not cause the tea to become bitter. Indeed, traditionally, African red tea has been allowed to steep for several days. If you want to make chilled African red tea, you can place the hot tea in the fridge to let it cool. Alternatively, double the amount of tea used and then pour the hot tea over a glass filled with ice cubes.