Home
Articles
Q&A

What are the functions and effects of green tea?

Sep 12, 2025 Source: Cainiu Health
Dr. Sun Lianqing
Introduction
Under normal circumstances, the main functions and benefits of green tea include antioxidant effects, refreshing the mind, promoting digestion, protecting teeth, and diuretic and fatigue-relieving properties. When drinking green tea, it is not advisable to consume overly concentrated tea, as this may irritate the stomach or cause nervous excitement. It is also not recommended to drink green tea on an empty stomach to avoid damaging the gastric mucosa. Additionally, consumption should be reduced before bedtime to prevent disruption of sleep quality.

Generally speaking, the main functions and benefits of green tea include antioxidant effects, refreshing the mind, promoting digestion, protecting teeth, diuretic effects, and relieving fatigue. A detailed explanation is as follows:

1. Antioxidant

Green tea is rich in tea polyphenols, a component that can remove excess free radicals in the body. Free radicals can damage cells, and moderate consumption of green tea may reduce this damage, providing some protection for the body and helping maintain normal physiological functions.

2. Refreshing the Mind

The caffeine in green tea can stimulate the central nervous system, helping to improve concentration and reaction speed. When people feel tired or mentally sluggish, moderate consumption of green tea can alleviate drowsiness, keep one alert, and enhance efficiency at work or study.

3. Promoting Digestion

Green tea contains certain amounts of caffeine and theophylline, which can stimulate gastric juice secretion and enhance gastrointestinal motility. For discomfort such as bloating caused by indigestion or dyspepsia, moderate consumption of green tea may provide some relief and help improve digestive function.

4. Protecting Teeth

Green tea contains fluoride, an essential element for maintaining dental health, which can strengthen teeth against cavities and reduce the risk of tooth erosion. Meanwhile, the tea polyphenols in green tea can also inhibit the growth of certain harmful bacteria in the mouth, helping to maintain oral hygiene.

5. Diuretic and Fatigue Relief

The caffeine and theophylline in green tea can act on the kidneys, promoting kidney metabolism and increasing urine excretion. Urination helps eliminate excess water and metabolic waste from the body, while also relieving physical fatigue caused by metabolism, making one feel more relaxed.

When drinking green tea, it is not advisable to consume overly strong green tea, to avoid gastrointestinal irritation or nervous system excitation; it is also not recommended on an empty stomach, to prevent damage to the gastric mucosa. Additionally, consumption should be reduced before bedtime to avoid affecting sleep quality.

Related Articles

View All
What are the effects and benefits of green tea?
Under normal circumstances, as a common beverage, green tea has various effects and functions, mainly including clearing heat and relieving summer heat, refreshing the mind, promoting metabolism, protecting oral health, and assisting in antioxidant activity. When drinking green tea, one should avoid consuming it on an empty stomach to prevent irritation of the gastrointestinal tract; excessive consumption before bedtime should also be avoided to prevent caffeine from affecting sleep; individuals with weak or cold gastrointestinal systems should reduce their intake and opt for weaker tea.
avatar
Dr. Yu Yongchao
View Full Answer
What are the functions and benefits of pomegranate juice?
Under normal circumstances, moderate consumption of pomegranate juice is beneficial to health. It mainly helps in supplementing vitamin C, promoting digestion, supporting cardiovascular health, replenishing fluids and electrolytes, and protecting eye health. Additionally, one should pay attention to consuming it in moderation to avoid excessive sugar intake caused by overconsumption. At the same time, a diverse diet should also be maintained in daily life to ensure balanced nutrition.
avatar
Dr. Yu Yongchao
View Full Answer
Can saffron be steeped in hot water together with tea leaves?
Under normal circumstances, saffron can be steeped in hot water together with tea, but it should be consumed in moderation. When drinking water infused with both saffron and tea, note that the typical amount of saffron should be 3–5 threads per serving, while the tea should be used according to standard brewing measurements. Excessive amounts of either may result in a bitter taste or increased bodily strain. It is not recommended to consume this mixture before bedtime, especially when combined with caffeinated teas such as green tea.
avatar
Dr. Sun Lianqing
View Full Answer
Can placenta be eaten, and what are its functions and benefits?
Under normal circumstances, the placenta that has been professionally processed is edible. Its functions and effects generally include supplementing proteins, providing trace elements, improving immune function, and assisting in regulating endocrine function; however, individual responses may vary. When consuming placenta, it is important to choose a healthy placenta processed by a legitimate medical institution, ensuring it has been thoroughly cleaned, disinfected, dried, and made into powder or capsule form.
avatar
Dr. Sun Lianqing
View Full Answer
Can people with cold body constitution drink green tea?
In general, whether individuals with a cold body constitution can drink green tea depends on the severity of their condition. Those with a mild cold constitution may occasionally consume small amounts, while those with a severe cold constitution are advised against drinking it. To improve cold body conditions, it is recommended to choose warm-natured beverages in daily life, such as brown sugar ginger tea, longan and red date tea, etc. Additionally, it is important to stay warm and avoid prolonged exposure to cold environments.
avatar
Dr. Sun Lianqing
View Full Answer
What are the functions and benefits of pear and tremella soup?
Under normal circumstances, as a common health-promoting sweet soup, pear and tremella soup combines the refreshing sweetness of pears and the soft, glutinous texture of tremella. Its functions and benefits mainly include soothing throat discomfort, replenishing body fluids, helping to relieve stress, aiding digestion, and providing energy. When consuming pear and tremella soup, individuals with elevated blood sugar levels should consider reducing the amount of rock sugar used or opt for a sugar-free version.
avatar
Dr. Yu Yongchao
View Full Answer
What to eat after a meal to prevent fat absorption
Under normal circumstances, consuming foods such as oats, chia seeds, apples, broccoli, and green tea after meals may also help block fat absorption. Additionally, under a doctor's guidance, medications such as orlistat capsules, metformin hydrochloride tablets, acarbose tablets, lovastatin capsules, and fenofibrate capsules can be taken to assist in preventing fat absorption. It is also important to control total calorie intake and combine this with appropriate physical activity in daily life.
avatar
Dr. Shen Yonghua
View Full Answer
Do people with excessive dampness drink black tea or green tea?
Whether individuals with excessive dampness should choose black tea or green tea depends on the type of dampness. Those with cold-damp constitution are suitable for drinking black tea, while those with damp-heat constitution are suitable for green tea. In daily life, in addition to selecting teas according to their constitutions, individuals with excessive dampness should also pay attention to dietary regulation, avoid raw, cold, and greasy foods, engage in appropriate exercise to promote blood circulation and dampness elimination, and maintain the body's yin-yang balance.
avatar
Dr. Sun Lianqing
View Full Answer
彩牛养生

Your trusted source for health information and wellness guidance.

Quick Links

Resources

Connect

© 2024 HealthPortal. All rights reserved.