Black, green, or herbal, we know that tea is the longevity beverage enjoyed by the world's longest-living people, but how does it work to extend longevity, alleviate stress, protect against cancer, and reduce the risk of heart disease?
Why tea is a longevity drink: With over 1,500 varieties, not including all the different herbal blends, it is a comforting and pleasant drink with healing effects. In blue zones, where it is consumed regularly, it is believed to be healthier than water. Green tea provides strong immune support for combating diseases and extending a quality life. Tea leaves contain powerful antioxidants called polyphenols that help prevent cancer, heart diseases, osteoporosis, and other chronic issues. Polyphenols are normally found in large quantities in fruits, vegetables, grains, coffee, and wine. Specific polyphenols in tea are called catechins or EGCG, which are more potent than polyphenols found anywhere else in nature.
How does tea prevent cancer? Cancer cells have special properties that allow them to survive longer than normal, healthy cells. When normal cells die, cancer cells tend to grow and spread throughout the body.
Numerous studies have presented the effects of green tea on cancer cells. It has been found to slow the growth of lung cancer cells and breast tumors. In a meta-analysis, it was discovered that women who regularly drink green tea have a lower risk of developing breast cancer. In a screening study for prostate, lung, colorectal, and ovarian cancers, which included over 100,000 individuals, researchers found that those who consumed green tea had an overall lower risk of developing all types of cancer.
Other research indicates that tea has a modest effect on cancer. More studies are needed. Even if the jury continues to drink tea to prevent cancer, there are plenty of other health benefits you can gain from tea consumption.
Can tea protect us from heart diseases and hypertension? In Japan, green tea is one of the most popular beverages. In a study conducted on over 40,000 Japanese individuals who regularly drank tea, there was a significantly lower risk of developing heart diseases. Studies showed over 30% lower risk for women and over 20% lower risk for men.
Deaths caused by strokes were even lower in this Japanese population, with over 60% reduction in women and over 40% in men. Catechins are known to inhibit the production of free radicals in arteries and tissues, preventing the formation of blood clots.
Drinking green tea for a year lowers blood pressure by over 45% in subjects who drank two and a half cups per day. For those who drank more than two and a half cups, hypertension decreased by 65%. In fact, the Journal of the American College of Nutrition concludes that tea, especially green tea and EGCG, is beneficial for heart health and metabolism.
Can tea help me relax? As it turns out, tea also reduces stress by increasing the level of relaxation and focus. The amino acid L-theanine counteracts any caffeine in tea and the agitation that can be associated with it. Tea is the only way you can get this supplement in your diet without taking a manufactured supplement.
Amino acids are said to increase brain activity to achieve a state of relaxed focus. The highest concentrations of L-theanine are in green and white tea varieties. It has been shown to decrease low-density lipoproteins (LDL) or bad cholesterol, combat body fat accumulation, inhibit viral diseases like colds or flu, and reduce plaque buildup on teeth.