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What the Research Says
MedlinePlus reports on green tea benefit studies found in the Natural Medicines Comprehensive Database. They rate effectiveness for various conditions based on scientific evidence on a scale including Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.
Likely Effective:
Genital warts. A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals) is FDA-approved for treating genital warts.
Increasing mental alertness (due to caffeine content).
Possibly Effective:
Preventing cancers (bladder, esophageal, ovarian, and pancreatic). In one study, women who drank 2 or more cups of green tea each day had a 46% lower risk of getting ovarian cancer than women who didn’t drink green tea.
Reducing the risk or delaying the onset of Parkinson’s disease. Drinking 1 to 4 cups of green tea daily seems to provide the most protection against developing Parkinson’s.
Low blood pressure. Might help elderly people who have low blood pressure after eating.
Decreasing high levels of fat like cholesterol and triglycerides in the blood.
Reducing abnormal development and growth of cells of the cervix (cervical dysplasia) caused by human papilloma virus (HPV) infection.
Preventing dizziness upon standing up in older people.
Possibly Ineffective: Preventing colon cancer.
Insufficient Evidence (More Research Needed):
Cancer (Breast, Prostate, Lung, Cervical, Stomach, Gastric, Skin, Leukemia). In one study, Chinese men who drink more green tea seem to have a lower risk of developing prostate cancer. The more tea they drink, the more their risk drops.
Dental cavities and gum disease (gingivitis). Chewing candy that contains green tea extract seems to control plaque build-up on the teeth and reduce gum swelling.
Weight loss. A specific green tea extract (EGCG) seems to help moderately overweight people lose weight. But it doesn’t seem to help keep weight off.
High blood pressure. Some research shows that drinking green tea regularly lowers the chance of getting high blood pressure. But not all research agrees.
Stroke prevention. A large study done in Japan found drinking 3 cups of green tea per day seems to significantly lower the risk of having a stroke.
Weak bones (osteoporosis). Drinking green tea for 10 years is associated with stronger bones.
Type 2 diabetes. Research suggests that Japanese adults who drink 6 or more cups per day of green tea have a 33% lower risk of developing type 2 diabetes compared to those who drink one cup or less per day (specially true for women).
Diarrhea.
Chronic fatigue syndrome (CFS).
Heart disease prevention.
Kidney stones.
What the Research Says
MedlinePlus reports on green tea benefit studies found in the Natural Medicines Comprehensive Database. They rate effectiveness for various conditions based on scientific evidence on a scale including Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, Ineffective, and Insufficient Evidence to Rate.
Likely Effective:
Genital warts. A specific green tea extract ointment (Veregen, Bradley Pharmaceuticals) is FDA-approved for treating genital warts.
Increasing mental alertness (due to caffeine content).
Possibly Effective:
Preventing cancers (bladder, esophageal, ovarian, and pancreatic). In one study, women who drank 2 or more cups of green tea each day had a 46% lower risk of getting ovarian cancer than women who didn’t drink green tea.
Reducing the risk or delaying the onset of Parkinson’s disease. Drinking 1 to 4 cups of green tea daily seems to provide the most protection against developing Parkinson’s.
Low blood pressure. Might help elderly people who have low blood pressure after eating.
Decreasing high levels of fat like cholesterol and triglycerides in the blood.
Reducing abnormal development and growth of cells of the cervix (cervical dysplasia) caused by human papilloma virus (HPV) infection.
Preventing dizziness upon standing up in older people.
Possibly Ineffective: Preventing colon cancer.
Insufficient Evidence (More Research Needed):
Cancer (Breast, Prostate, Lung, Cervical, Stomach, Gastric, Skin, Leukemia). In one study, Chinese men who drink more green tea seem to have a lower risk of developing prostate cancer. The more tea they drink, the more their risk drops.
Dental cavities and gum disease (gingivitis). Chewing candy that contains green tea extract seems to control plaque build-up on the teeth and reduce gum swelling.
Weight loss. A specific green tea extract (EGCG) seems to help moderately overweight people lose weight. But it doesn’t seem to help keep weight off.
High blood pressure. Some research shows that drinking green tea regularly lowers the chance of getting high blood pressure. But not all research agrees.
Stroke prevention. A large study done in Japan found drinking 3 cups of green tea per day seems to significantly lower the risk of having a stroke.
Weak bones (osteoporosis). Drinking green tea for 10 years is associated with stronger bones.
Type 2 diabetes. Research suggests that Japanese adults who drink 6 or more cups per day of green tea have a 33% lower risk of developing type 2 diabetes compared to those who drink one cup or less per day (specially true for women).
Diarrhea.
Chronic fatigue syndrome (CFS).
Heart disease prevention.
Kidney stones.
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