Other Risks: Long-term consumption, in excessive quantities, may give rise to problems such as insomnia, restlessness, annoyance, irritability, headaches, hypertension, abnormal heartbeat, loss of appetite, spasms, constipation, and acute addiction to caffeine. Many times, people who are addicted to caffeine do not feel normal without the substance and suffer from acute constipation, irritation, and lack of concentration in the absence of green tea.
I'm a mom of two boys and live in Larkspur, CA, but still call South Africa my home. I grew up (literally) with Rooibos Tea: a naturally caffeine free beverage that has been used by generations of South Africans for anything from a delicious anytime drink, to a soothing beverage to calm Baby's colic, to putting in the bath for dry & flaky skin. You name it, Rooibos is the cure. 
Instead of being rolled, shaped and dried like traditional green tea leaves, the leaves destined to become Matcha are laid flat to dry. Grinding the leaves into Matcha is a slow process. If the mill stones overheat, the delicate green tea leaves might become damaged, which alters the flavor and taste. For reference, it takes about one hour to grind 30g of Matcha.
It’s important to point out that while it might be very beneficial, drinking green tea alone likely won’t improve your life span or protect you from disease. Research suggests that a combination of lifestyle components account for the health benefits observed in people that drink tea. The problem with many studies that investigate the effects of green tea is that they are population studies rather than controlled clinical studies, according to the Mayo Clinic. In many of these studies, other lifestyle factors and habits besides drinking green tea are not well-controlled, so it’s difficult to draw conclusions. Overall, studies have found a great number of health benefits of green tea, especially as it relates to anti-aging, but the bottom line is that the quality of your overall diet is really what’s most important.
Even organically grown green teas have been shown to contain lead, which is absorbed by the plant from the environment, particularly tea grown in China. When traditional green tea is steeped, about 90% of the lead stays in the leaf, which is discarded. With matcha, since the whole leaf is consumed, you will ingest more lead. One independent group, ConsumerLab.com, which tested teas, estimates that a cup of matcha may contain as much as 30 times more lead than a cup of green tea. Therefore, they recommend drinking no more than one cup daily, and not serving it to children.
In addition to actual tea, detox concoctions typically include additional herbs, which may be designed to curb appetite, rev metabolism, or boost weight loss in other ways. One example is senna, a plant with a natural laxative effect. According to the Natural Medicines Comprehensive Database, the potential side effects of senna use may include abdominal pain and discomfort, cramps, bloating, gas, nausea, and diarrhea; excessive use can lead to potassium depletion and other electrolyte abnormalities, which can trigger muscle spasms and an abnormal heart rhythm. Another popular ingredient in weight loss teas is guarana, a plant that's often added to energy drinks. Its side effects are commonly related to its caffeine content, which may include nervousness, restlessness, stomach irritation, nausea, vomiting, headache, anxiety, agitation, ringing in the ears, and fast heart and breathing rates. Bottom line: Do your homework about exactly what's in a product before you put it in your body. Even "all-natural" substances can have potential side effects, especially if they're overused, combined with other supplements or medications that result in negative interactions, or if taken by those with pre-existing medical conditions.
Several large, population-based studies show that people who regularly drink black or green tea may be less likely to have heart attacks and strokes. However, people who drink tea tend to be different from people who don't drink tea. "We can't quite disentangle whether it's their tea drinking or something else those people are doing that lowers their risk of cardiovascular disease," explains Dr. Sesso. "Some experts believe that tea may have cardiovascular benefits, but it's not considered a slam-dunk proposition."
Usucha, or thin tea, is prepared with approximately 1.75 grams (amounting to 1.5 heaping chashaku scoop, or about half a teaspoon) of matcha and approximately 75 ml (2.5 oz) of hot water per serving, which can be whisked to produce froth or not, according to the drinker's preference (or to the traditions of the particular school of tea). Usucha creates a lighter and slightly more bitter tea.
A University of Miami study found that even a mild dose of green tea’s antimicrobial and antioxidant compounds erased almost two-thirds of pimples from people with mild to moderate acne when used twice daily for six weeks. To benefit, make a cup of green tea, let cool, and use as a face wash, or lay the tea bag directly on the skin to act as a compress for particularly bad pimples. For oily skin, mix peppermint tea with the green tea for an oil-blasting wash. Check out more teas that also work as acne home remedies.
Loose leaf green tea has been the most popular form of tea in China since at least the Southern Song dynasty.[38][39] While Chinese green tea was originally steamed, as it still is in Japan, after the early Ming dynasty it has typically been processed by being pan-fired in a dry wok.[40] Other processes employed in China today include oven-firing, basket-firing, tumble-drying and sun-drying.[41] Green tea is the most widely produced form of tea in China, with 1.42 million tons grown in 2014.[42]
Green tea has slightly more antioxidants compared to black tea, although both are still great sources. The ORAC value (antioxidant content) of brewed black tea is 1,128 while green tea is slightly higher at 1,253. Black tea and green tea both contain antioxidants, including polyphenols. Some research shows that green tea contains more than four times the catechins that black tea does. Both types can contribute antioxidants to your diet and have been shown to have antiviral, anti-inflammatory, detoxifying and immune-stimulating effects.
Apart from causing premature aging, free radicals are also responsible for causing certain types of cancer. The catechins present in green tea neutralize these free radicals, prevent the formation of carcinogens like nitrosamines and reduce the risk of cancer for people who regularly consume it. Green tea is now being clinically used and prescribed as a home remedy to aid in the prevention of cancer, particularly for those patients at high risk for cancer in the colon, rectum, pancreas, and intestines.
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