Health Benefits of Black Tea
The black tea we refer to today was originally called red tea in China many decades ago. Today we typically think of English Breakfast, Irish Breakfast and Early Grey however these teas all had their origins in China. Black tea contains antioxidants called polyphenols that protect human cells from hazardous free radical damage. The consumption of Black tea has been found to lower ovarian cancer risk, reduce risk of diabetes, heart disease and Parkinson’s disease (1)
Black Tea Boosts Heart Health
A Chinese study in 2017 looked at the effects of tea consumption on the risk of ischaemic heart disease. The study was conducted over a 7 year period, anaylised the data 487,375 people aged 30-79, from 10 regions across China and found that tea consumption (green tea, oolong tea, pu’er tea, black tea or others) had a direct co-relationship with lower rates of major coronary events (heart attacks) and ischaemic heart disease (2).
A Harvard study published in the American Journal of Clinical Epidemiology in 1999 analysed 340 men and women who had heart attacks and compared them to a control group. The researchers discovered a 44% reduction in the risk of heart attack among those who drank a cup of black tea or more daily compared to the non-tea drinkers (3)
Another randomized controlled clinical study in 2012 analysed the effect of black tea consumption on fasting blood plasma levels of glucose, lipid profiles and antioxidant status in a normal population – all cardiovascular risk factors. This study found that consumption of 9 grams of black tea per day was linked to a “a highly significant decrease” of cardiovascular risk factors, including triglyceride levels and fasting serum glucose. There was also a significant decrease in the ratio of LDL to HDL cholesterol as well as an increase in HDL (“healthy”) cholesterol levels. The researched concluded that black tea consumed within a normal diet contributes to a decrease of independent cardiovascular risk factors and improves the overall antioxidant status in humans (4).
Black Tea and Cancer
Black tea has also shown varying degrees of evidence with regards to inducing cancer cell apoptosis (cell death) or protecting against cancer generally (5).
A Cohort study of 58,279 men from the Netherlands conducted in 2003 showed that men who drank black tea did not develop advanced stage prostate cancer. There was however no notable effect upon early stage cancers (6)
Another promising scientific review in 2016 indicated how the theaflavin-3 found in dark tea had an exceptionally solid capacity to stop the development of cisplatin-safe malignant ovarian cells. An exceptionally great discovery since cisplatin is said to be “a stand out amongst the expansive range of anticancer medications.” what’s more, the theaflavin-3 showed no toxicity to the normal ovarian cells surrounding the malignant cells, which is marvellous since numerous customary anticancer medications destroy both malignant and normal cells (7, 8).
Black Tea and Diabetes
Diabetes is developing into epidemic proportions world wide. A study into the relationship between tea, coffee and diabetes was published in the Journal Diabetologia. The study followed 40,011 people over 10 years. At the end point in the study it was found that 918 people had developed type 2 diabetes. This study was conducted in Europe of which black tea is the predominate tea consumed. The researchers found that consumption of tea and coffee was associated with a reduced risk of type 2 diabetes. To be more precise – drinking at least three cups of tea or coffee per day resulted in a 42% decreased risk of type 2 diabetes (9). It would be sensible to include black tea as part of any diabetic diet strategy.
Black Tea and Stroke
A 2003 meta-analysis published in the American Heart Association Journal – Stroke, suggests that daily consumption of either green tea or black tea equalling 3 cups or more per day could prevent the onset of ischemic stroke. Specifically, researchers found that people who consumed 3 or more cups of tea per day had an overall 21% lower risk of stroke as compared to the people who drank less than one cup daily (8).
A Swedish study in 2013 of 74,961 Swedish women and men, published in the Annals of Epidemiology, showed reduced risk of stroke for people who consume four or more cups of black tea per day (9).
Black Tea, Stomach and Gut Issues
Black tea polyphenols have also been shown to reduce diarrhoea with regards to Inflammatory Bowel Disease (IBS) and diarrhoea in general. The Thearubigens down regulate inflammatory chemicals (cytokines) that are implicated in IBS (10, 11).
The caffiene in black tea may be a concern for some people so it is possible to obtain decaffinated black tea.
A 2016 randomised study published in the Journal of Evidence-Based Complementary and Alternative Medicine conducted on 2 to 12 year old children, who had acute nonbacterial diarrhoea, showed that black tea tablets were very effective at reducing non-bacteria related diarrhoea. There were also no notable side effects (12).
Black Tea has Antibacterial Ability
Black tea tannins and polyphenols have also been found to contain strong anti bacterial actions against gram positive bacteria. The non-polymeric phenolic compounds contained in black tea were absorbed into the gastro-intestinal tract thus providing antibacterial action within the gastro-intestinal tissues (13)
Another 2015 study showed that black tea combined with honey could specifically eliminate H. pylori bacteria which ultimately causes stomach ulcers (14).
Black Tea Lowers Stress Hormones
Black tea has also been shown to reduce stress by limiting the cortisol produced by the body during stressful events.
A 6 week study by the University College London published in the Journal Psychopharmacology of 75 male, non smoking, tea drinkers given 4 cups of black tea daily found a 57% difference in the time taken for cortisol to recede after a stressful task. The cortisol levels at the 50 minute mark were reduced by 47% in the tea drinking group and 27% in the non-tea drinking group.
The tea drinkers were also found to express themselves in a calmer manner 50 minutes after the stress inducing events compared to the non tea drinkers.
Blood platelet activation was also lower in the tea drinking group. Having lower blood platelet activation is very good because blood platelets can adhere to one another and to collagen under the endothelium, forming a platelet plugs thus raising the risk of heart attack and stroke (15)
Black Tea and Kidney Stones
Drink black tea has also been linked to a reduction or low incidence of kidney stones.
A 1996 study looked at the fluid intake from beverages of 45,289 male health professionals over a 6 year duration and found that for every 236 ml of tea consumed daily the risk was decreased by 14% (16).
In another study of 81,093 nurses in 1998 researchers discovered that for every 236 ml of tea consumed daily the risk was decreased by 8% (17).
Black Tea and Osteoporosis
A 2015 study led by Keizo Nishikawa of Osaka University, published in the US journal Nature Medicine discovered that the polyphenol (antioxident) Theaflavin-3 (TF-3) inhibited a functional enzyme called DNA methyltransferase, that breaks down bone tissue. Unfortunately the amount Theaflavin-3 (TF-3) needed for a clinical effect could only be achieved by drinking 60 cups of tea per day (for a 60kg person) (18).
However an Australia study (2003-2004) conducted over 5 years – Calcium Intake Fracture Outcome Study (CAIFOS), showed that consuming multiple cups of black tea (as opposed to green tea, white tea, oolong tea or pu’er tea) with or without milk was linked to a substantially lower risk of fractures in older women.
The study focused upon over a 1000 women (mean age of 75). the researchers discovered that those who drank at least three cups of tea a day had a 34% lower risk of developing a serious osteoporotic fracture and a 42% lower risk of developing a hip fracture, compared with women who rarely drank tea (19, 20).
(3) Sesso HD, Gaziano JM, Buring JE, Hennekens CH. Coffee and tea intake and the risk of myocardial infarction. Am J Epidemiol 1999;149:162-7.
(16) Curhan GC, Willett WC, Rimm EB, et al. Prospective study of beverage use and the risk of kidney stones. Am J Epidemiol 1996;143:240–7.
(17) Curhan GC, Willett WC, Speizer FE, Stampfer MJ. Beverage use and risk for kidney stones in women. Ann Intern Med 1998;128:534–40.
Golden Ocean Chinese Tea
Specialising in various kinds of Black tea, Green tea, White tea, Yellow tea, Oolong tea, Dark tea, Pu Erh Tea, Scented tea, Flowering tea, Herbal tea and Tea Powder, Tea ware, Tea pots, cups, mugs, Tea canisters, Tea containers. We supply the finest and rarest Chinese teas imported directly from China.
59A Campbell Parade, Manly Vale NSW 2093