Researchers from the Netherlands confirmed in a recent study that two green tea compounds, L-theanine and caffeine, can significantly boost levels of attention and alertness, building on what is already known about the brain benefits of green tea. The drink is less likely to make you jittery and anxious than other energy-boosting drinks, because it contains lower levels of caffeine than other teas or coffee. In another study published in the American Journal of Clinical Nutrition, researchers discovered that drinking just one cup of green tea a day made people age 55 and older 38 percent less likely to experience a decline in their mental abilities. Drinking a second cup daily made them 54 percent less likely to show mental declines.
Rooibos is sometimes used as substitute for milk with colicky babies, says Alvaro Viljoen, PhD, of the department of pharmacy at the University of the Witwatersrand. And the health benefits of Rooibos are bound to make it a favorite, he says: rich in antioxidants, rich in vitamin C, caffeine-free, and low in tannins, the residue in teas that can sometimes cause digestive problems.
The most popular, widely consumed types of green teas hail from the places where green tea originated: China and Japan. Green teas from China and Japan have different flavor profiles based on where and how they are grown, but most distinctively how they are processed—pan fired in China and steamed in Japan. Other countries producing green tea typically take cues from China or Japan and adopt one of these country’s tea production styles.
facilitates the burning of body fat. Green tea promotes the body’s ability to burn fat through thermogenesis and fat oxidation. A study published in The American Journal of Clinical Nutrition found the combination of polyphenols and caffeine from an extract of green tea resulted in a “significant increase” of energy expenditure compared to placebo.
It depends not only on the processing method the tea producers use, but also on the cultivation practices the tea growers use. What time of year is the tea plucked? How is the plant pruned? What parts of the plant are plucked? Are the plants treated with chemicals or are they organically grown? What kind of heat is applied to the tea leaves to stop oxidation? How are the tea leaves shaped, rolled and dried? Are the leaves left whole or cut in smaller pieces?
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."
Others credit various Buddhists in the 500s BC and subsequent centuries for the discovery of tea. Buddhists would travel between India and China spreading their religion, culture and ritual of tea. Buddhist monks grew, harvested and produced tea much like their Catholic counterparts in European monasteries did with grapes and wine. The monks’ habit of tea drinking for physical refreshment, to aid meditation and as a substitute for alcohol developed into a spiritual and social practice that spread across China.
In 2004, scientists at the University of Newcastle studied the effects of black and green tea on Alzheimer’s disease. In laboratory studies, both teas prevented the breakdown of acetylcholine, the neurotransmitter strongly linked with memory. The teas also inhibited enzymes known as BuChE and beta-secretase. These enzymes are found in protein deposits found in the brain of Alzheimer’s patients. (7)
What are different green teas made of exactly, and are they totally natural? Green, black and oolong teas come from the Camellia sinensis plant. Green tea consists of leaves that haven’t been fermented so they contain the highest level of antioxidants. For example, flavonoid antioxidants account for about 30 percent of the dry weight of green tea leaves. (3)
Rooibos is especially rich in the super-antioxidant compound quercetin. A titan among the antioxidants, quercetin imparts benefits to the heart, helps to reduce the risk of various types of cancers, fights viruses and is significantly anti-inflammatory. Inflammation is part of all known chronic degenerative diseases. The anti-inflammatory activity of quercetin means that it helps to reduce the risk of many types of health disorders.