In 2013, global production of green tea was approximately 1.7 million tonnes, with a forecast to double in volume by 2023. As of 2015, China provided 80% of the world's green tea market, leading to its green tea exports rising by 9% annually, while exporting 325,000 tonnes in 2015. In 2015, the US was the largest importer of Chinese green tea (6,800 tonnes), an increase of 10% over 2014, and Britain imported 1,900 tonnes, 15% more than in 2014. In 2015, Kenya was the largest exporter of black tea in the world (443,000 tonnes).
The rooibos plant is endemic to a small part of the western coast of the Western Cape province of South Africa. It grows in a symbiotic relationship with local micro-organisms. Scientists speculate that climate change may threaten the future survival of the plant and the R600-million (approximately €43-million in March 2017) rooibos industry. Some claim that increasing temperatures and decreasing rainfall may result in the extinction of the plant within the next century.
Green tea leaves are initially processed by soaking in an alcohol solution, which may be further concentrated to various levels; byproducts of the process are also packaged and used. Extracts may be sold in liquid, powder, capsule, or tablet form. Decaffeinated versions are also available. Green tea extract supplements are accessible over the counter in various forms.
This tea is a rich source of antispasmodic agents, which can ease severe stomach cramps and abdominal pains. This is mainly due to the activation of K+ (potassium) ions in the body without antagonizing the activities of calcium, according to a report published in the Basic & Clinical Pharmacology & Toxicology. This can reduce the presence of hyperactivity in the gastrointestinal tract, thus preventing diarrhea and other intestinal issues.
Basic green and black teas are rich in antioxidants (and matcha green tea is more than 100 times higher in one powerful antioxidant)—the secret behind boosting your natural cleansing process. “Antioxidants work to reduce the oxidative stress and free radicals in our body, too much of which can cause chronic inflammation and even mutate our DNA strains, leading to cancer and other chronic diseases,” says Villacorta.
Sometimes given to babies suffering from colic, rooibos is known for anti-spasmodic activity. A growing body of evidence suggests that the health benefits of rooibos may be quite broad, including evidence that the antioxidants in the tea may reduce the risk of heart disease, and may inhibit some parameters of aging. Rooibos even shows use as a cosmetic ingredient for soothing, protecting and repairing skin.