According to the National Cancer Institute, the polyphenols in tea have been shown to decrease tumor growth in both animal and laboratory studies. Researchers believe that it is the high level of polyphenols in tea that help kill cancerous cells and stop them from growing, although the exact mechanism by which tea inhibits and prevents cancerous cells is uncertain.
One of the primary reasons for the popularity and consumption of all kinds of tea by human civilizations is its stimulating effect. This effect, again, is due to the caffeine and tannins present in the tea leaves. Caffeine and tannins, despite their potentially adverse effects on health, in the long run, act as very powerful stimulants. That is why a cup of tea makes you feel fresh and highly energized. Tea is an easy and ideal solution to counter fatigue, laziness, sleepiness, and lack of energy, and to improve blood circulation. This is why it is so popular with a wide variety of people in various industries, including professionals, housewives, students, and anyone else who has ever felt a bit drowsy during the day!
Both nutritionists we spoke to agree that drinking tea when you wake up and before bed can help your system rev up and calm down, depending on which variety you choose. If you’re a tea fanatic, work in a few cups throughout the day: Unless you’re sensitive to caffeine, you can probably handle five to seven cups a day without any negative side effects, says Lagano.
Shade grown: All matcha is made from shade-grown tea leaves—a labor-intensive process where tea bushes are protected from the sun and light is filtered to the bushes in a very controlled manor. Shading boosts the chlorophyll production in the plant, giving the leaves a rich green color. The lack of sun reduces the plant’s photosynthesis of the leaves, which in turn alters the naturally occurring levels of caffeine, flavanols, sugars, antioxidants, and theanine. By controlling the sun exposure, tea producers can significantly alter the chemical make-up and flavor of the final tea leaves.