I want to know about the good and bad effects of green tea.Please tell.

Question

Green tea is taken by mouth to improve mental alertness and thinking.

It is also taken by mouth for depression, non-alcoholicfatty liver disease (NAFLD), inflammatory bowel disease (ulcerative colitis or Crohn's disease), weight loss and to treat stomach disorders, vomiting, diarrhea, headaches, and bone loss (osteoporosis).

Some people take green tea by mouth to prevent various cancers, including breast cancer, prostate cancer, colon cancer, gastric cancer, lung cancer, liver cancer, solid tumor cancers, leukemia, and skin cancer related to exposure to sunlight. Some women use green tea to fight human papilloma virus (HPV), which can cause genital warts, the growth of abnormal cells in the cervix (cervical dysplasia), and cervical cancer.

Green tea is also taken by mouth for Parkinson's disease, diseases of the heart and blood vessels, diabetes, low blood pressure, chronic fatigue syndrome (CFS), dental cavities (caries), kidney stones, and skin damage.

Instead of drinking green tea, some people apply green tea bags to their skin to soothe sunburn and prevent skin cancer due to sun exposure. Green tea bags are also used to decrease puffiness under the eyes, as a compress for tired eyes or headache, and to stop gums from bleeding after a tooth is pulled. A green tea footbath is used for athlete's foot.
Some people gargle with green tea to prevent colds and flu. Green tea extract is also used in mouthwash to reduce pain after tooth removal. Green tea in candy is used for gum disease.
Green tea is touted for its health benefits, and for good reason. The brewed beverage contains micronutrients called catechins, which may help stave off colds and flues while protecting your cardiovascular health. Even healthy beverages sometimes have downsides, however, and green tea can cause side effects for some people, especially in large doses.

Caffeine Jitters

Like all teas, green tea contains caffeine, and excessive caffeine intake can lead to nervousness, anxiety, abnormal heart rhythm and shakiness. Some people have a low tolerance for caffeine, and they will suffer these symptoms even when ingesting small amounts. High caffeine consumption can also hinder calcium absorption, affecting your bone health and increasing the risk of osteoporosis, a condition in which bones grow brittle and may fracture easily. To help prevent caffeine-related problems, limit green tea intake to five or fewer cups per day.

Iron-Absorption Issues

Green tea can reduce the bioavailability of nonheme iron, which means your body is less able to absorb this nutrient. Nonheme iron is the primary type of iron in eggs, dairy and plant foods such as beans, so drinking green tea with these foods may lead to reduced iron absorption. Vitamin C increases nonheme iron absorption, however, so you can lessen the effect by squeezing lemon into your tea or consuming other vitamin-C rich foods, such as broccoli, with your meal. In addition, drinking tea between meals seems to have little effect on iron absorption, according to the National Cancer Institute.

Medical Interactions

Green tea is generally safe for healthy people to consume. If you're on any medications, however, or have any illnesses, check with your doctor before drinking it. Green tea may create problems if you're taking stimulants, hormones, antibiotics, blood thinners, certain asthma medications or any drug that poses a risk of liver damage. Green tea can also worsen diarrhea, glaucoma, bleeding disorders and multiple other conditions.

Sajeev Kumar · Accepted Answer

Green tea is taken by mouth to improve mental alertness and thinking.

It is also taken by mouth for depression, non-alcoholicfatty liver disease (NAFLD), inflammatory bowel disease (ulcerative colitis or Crohn's disease), weight loss and to treat stomach disorders, vomiting, diarrhea, headaches, and bone loss (osteoporosis).

Some people take green tea by mouth to prevent various cancers, including breast cancer, prostate cancer, colon cancer, gastric cancer, lung cancer, liver cancer, solid tumor cancers, leukemia, and skin cancer related to exposure to sunlight. Some women use green tea to fight human papilloma virus (HPV), which can cause genital warts, the growth of abnormal cells in the cervix (cervical dysplasia), and cervical cancer.

Green tea is also taken by mouth for Parkinson's disease, diseases of the heart and blood vessels, diabetes, low blood pressure, chronic fatigue syndrome (CFS), dental cavities (caries), kidney stones, and skin damage.

Instead of drinking green tea, some people apply green tea bags to their skin to soothe sunburn and prevent skin cancer due to sun exposure. Green tea bags are also used to decrease puffiness under the eyes, as a compress for tired eyes or headache, and to stop gums from bleeding after a tooth is pulled. A green tea footbath is used for athlete's foot.
Some people gargle with green tea to prevent colds and flu. Green tea extract is also used in mouthwash to reduce pain after tooth removal. Green tea in candy is used for gum disease.
Green tea is touted for its health benefits, and for good reason. The brewed beverage contains micronutrients called catechins, which may help stave off colds and flues while protecting your cardiovascular health. Even healthy beverages sometimes have downsides, however, and green tea can cause side effects for some people, especially in large doses.

Caffeine Jitters

Like all teas, green tea contains caffeine, and excessive caffeine intake can lead to nervousness, anxiety, abnormal heart rhythm and shakiness. Some people have a low tolerance for caffeine, and they will suffer these symptoms even when ingesting small amounts. High caffeine consumption can also hinder calcium absorption, affecting your bone health and increasing the risk of osteoporosis, a condition in which bones grow brittle and may fracture easily. To help prevent caffeine-related problems, limit green tea intake to five or fewer cups per day.

Iron-Absorption Issues

Green tea can reduce the bioavailability of nonheme iron, which means your body is less able to absorb this nutrient. Nonheme iron is the primary type of iron in eggs, dairy and plant foods such as beans, so drinking green tea with these foods may lead to reduced iron absorption. Vitamin C increases nonheme iron absorption, however, so you can lessen the effect by squeezing lemon into your tea or consuming other vitamin-C rich foods, such as broccoli, with your meal. In addition, drinking tea between meals seems to have little effect on iron absorption, according to the National Cancer Institute.

Medical Interactions

Green tea is generally safe for healthy people to consume. If you're on any medications, however, or have any illnesses, check with your doctor before drinking it. Green tea may create problems if you're taking stimulants, hormones, antibiotics, blood thinners, certain asthma medications or any drug that poses a risk of liver damage. Green tea can also worsen diarrhea, glaucoma, bleeding disorders and multiple other conditions.