Tea contains about half the amount of caffeine found in coffee, so moderate consumption of green tea is unlikely to cause problems for the majority of people.
However, beware if you are drinking green tea powder or matcha! Not only it is easy to overdose, these products could also contain higher concentration of caffeine.
If you are sensitive to caffeine, here are the symptoms to watch out for:
restlessness
irritability
sleeping problems
tremor
heart palpitations
loss of appetite
upset stomach
nausea
frequent urination
skin rash
Contains Caffeine:
Green tea also contains some caffeine and excess consumption ( three to five times a day) can cause insomnia, excessive urination, irregular heart beat, stomach upset, nausea, diarrhea and ringing in ears.
Caffeine can increase heart rate and blood pressure, although people who consume caffeine regularly don't seem to experience these effects in the long-term.
Caffeine can also increase blood sugar levels. Diabetes patients should drink it cautiously.
The same applies to those with psychological disorders, especially anxiety or panic disorders, and overactive thyroid or hyperthyroidism.
Avoid Green Tea On Empty Stomach:
You should not have green tea while fasting or on an empty stomach as it can cause toxicity to the body. It causes kidney, liver and digestive track toxicities. This is one of the negative side effects of green tea.
It Increases Stomach Acids:
Green tea can aggravate peptic ulcer and acidity as it can increase the acidity of stomach if taken before meals. It can cause pain in stomach, constipation and nausea. So take it after meals always.
Drinking green tea at the wrong time, such as with a meal or first thing in the morning can also cause nausea.
A 1984 study concluded that "tea is a potent stimulant of gastric acid, and this can be reduced by adding milk and sugar."
Health Problems:
If you are allergic to any of the ingredients present in green tea, you must avoid it. You should consult a doctor before taking green tea if you are on some medication such as warfarin (blood thinning medication).
Interference With Medication:
As green tea in very effective healing herbal tea and kills cancer cells. But at then same time it may decrease the effectiveness of cancer medicine such as bortezomib. This is one of the green tea harmful effects.
Iron Deficiency:
The tannins present in green tea prevent the absorption of iron supplements and iron from foods into the blood thus rendering them ineffective. To avoid iron deficiency anaemia, you must not take green tea in excess amounts.
A 2001 study reports that green tea extract reduces the absorption of non-heme iron by 25%.
However, another 2005 study found that long-term drinkers develop protective mechanism by having heavier parotic glands. The protein rich saliva neutralizes the harmful effect of tea tannin.
Miscarriage And Harmful Effects:
To New Born Is green tea safe in pregnancy? You must avoid green tea or at the maximum you can ave one cup of green tea while you are pregnant and nursing your baby. As in pregnancy having too much of green tea can increase the risk of miscarriage and in lactation it may cause harmful effects to your baby.
Osteoporosis (Bone Thinning):
Excess consumption of green tea can cause elimination of calcium from bones and increases it's excretion in urine. You may suffer from iron deficiency and must take iron supplements to compensate the loss.
Increase The Risk Of Glaucoma:
It a condition of eyes in which the pressure of eyes increase (intra ocular pressure) and can lead to blindness. Having green tea in excess can aggravate this condition in people already suffering from glaucoma.
Insomnia:
If you are already suffering form sleeplessness, then you must avoid too much intake of green tea. As green tea contains caffeine which stimulates brain and keeps you awake. This is one of the precautions with green tea.
When You Experience Premenstrual syndrome (PMS):
This is a hard one to call as the evidence is mixed.
A 2005 study found that green tea reduces the level of estrogens in the body. It is not clear if this aggravates hot flashes. If hot flashes is a concern to you, please exercise caution with drinking any tea beverage.
However, a 2003 study suggests that green tea, when taken with other herbs, may alleviate post menopausal symptoms.
Low Quality Green Tea Bags And Matcha:
Drinking too much low quality tea can be dangerous. It may contain contaminants such as lead (from road traffic pollution), pesticides and fluoride. The latter can be a concern if you are already drinking water that is rich in fluoride.
Low quality tea products are made from tea plants grown in low altitude or at roadside exposed to lots of car fumes. The tea farms are harvested frequently, which means pesticides have to be used. In addition, mature leaves are plucked, rather than baby tea buds. This means the tea will contain more fluoride that is accumulated from the environment.
Low quality tea leaves are usually used to make flavored tea products in the form of tea bags, matcha and iced tea, as on their own these leaves usually taste awful.
A 2005 study raised concerns about instant iced tea. A middle aged woman was diagnosed with skeletal fluorosis for drinking up to 2 gallons of iced tea daily. Why? Because her green tea contained too much fluoride.
University of Derby also reported on a study that found that economy tea bags from supermarket brands can contain dangerous concentration fluoride, making UK people susceptible to fluorosis.
Laura Chan, who carried out the study for her PhD at the University of Derby, said: "The tea plant, Camellia sinensis, is a fluoride accumulator, with mature leaves accumulating most of the fluoride."
"When tea is harvested, these older leaves may be used to produce lower quality, stronger teas such as economy teas, whereas the bud and newer top leaves are used in the manufacture of higher grade and speciality tea products."
When you have or are prone to forming kidney stones:
Kidney stones are mineral deposits made up of calcium, uric acid or the amino acid cysteine. At least three quarters of kidney stones are composed of calcium combined with phosphate or oxalic acid. Tea is a concern because it is rich in oxalic acid.
However, contrary to expectations, recent studies suggest that while black tea contains oxalic acid, green tea actually contains very little oxalic acid. In addition, green tea inhibits urinary stone formation and prevents kidney stones!
Cough Or Blocked Nose:
If you are healthy and are drinking green tea to help boost your immunity, you are probably doing the right thing. Scientific studies have found tea to protect you against virus and bacteria.
However, if you are already suffering from cough and blocked nose, drinking tea would probably make thing worse.
In Traditional Chinese Medicine, green tea is considered cooling and damp.
Caffeine can also increase blood sugar levels. Diabetes patients should drink it cautiously.
The same applies to those with psychological disorders, especially anxiety or panic disorders, and overactive thyroid or hyperthyroidism.
Avoid Green Tea On Empty Stomach:
You should not have green tea while fasting or on an empty stomach as it can cause toxicity to the body. It causes kidney, liver and digestive track toxicities. This is one of the negative side effects of green tea.
It Increases Stomach Acids:
Green tea can aggravate peptic ulcer and acidity as it can increase the acidity of stomach if taken before meals. It can cause pain in stomach, constipation and nausea. So take it after meals always.
Drinking green tea at the wrong time, such as with a meal or first thing in the morning can also cause nausea.
A 1984 study concluded that "tea is a potent stimulant of gastric acid, and this can be reduced by adding milk and sugar."
Health Problems:
If you are allergic to any of the ingredients present in green tea, you must avoid it. You should consult a doctor before taking green tea if you are on some medication such as warfarin (blood thinning medication).
Interference With Medication:
As green tea in very effective healing herbal tea and kills cancer cells. But at then same time it may decrease the effectiveness of cancer medicine such as bortezomib. This is one of the green tea harmful effects.
Iron Deficiency:
The tannins present in green tea prevent the absorption of iron supplements and iron from foods into the blood thus rendering them ineffective. To avoid iron deficiency anaemia, you must not take green tea in excess amounts.
A 2001 study reports that green tea extract reduces the absorption of non-heme iron by 25%.
However, another 2005 study found that long-term drinkers develop protective mechanism by having heavier parotic glands. The protein rich saliva neutralizes the harmful effect of tea tannin.
Miscarriage And Harmful Effects:
To New Born Is green tea safe in pregnancy? You must avoid green tea or at the maximum you can ave one cup of green tea while you are pregnant and nursing your baby. As in pregnancy having too much of green tea can increase the risk of miscarriage and in lactation it may cause harmful effects to your baby.
Osteoporosis (Bone Thinning):
Excess consumption of green tea can cause elimination of calcium from bones and increases it's excretion in urine. You may suffer from iron deficiency and must take iron supplements to compensate the loss.
Increase The Risk Of Glaucoma:
It a condition of eyes in which the pressure of eyes increase (intra ocular pressure) and can lead to blindness. Having green tea in excess can aggravate this condition in people already suffering from glaucoma.
Insomnia:
If you are already suffering form sleeplessness, then you must avoid too much intake of green tea. As green tea contains caffeine which stimulates brain and keeps you awake. This is one of the precautions with green tea.
When You Experience Premenstrual syndrome (PMS):
This is a hard one to call as the evidence is mixed.
A 2005 study found that green tea reduces the level of estrogens in the body. It is not clear if this aggravates hot flashes. If hot flashes is a concern to you, please exercise caution with drinking any tea beverage.
However, a 2003 study suggests that green tea, when taken with other herbs, may alleviate post menopausal symptoms.
Low Quality Green Tea Bags And Matcha:
Drinking too much low quality tea can be dangerous. It may contain contaminants such as lead (from road traffic pollution), pesticides and fluoride. The latter can be a concern if you are already drinking water that is rich in fluoride.
Low quality tea products are made from tea plants grown in low altitude or at roadside exposed to lots of car fumes. The tea farms are harvested frequently, which means pesticides have to be used. In addition, mature leaves are plucked, rather than baby tea buds. This means the tea will contain more fluoride that is accumulated from the environment.
Low quality tea leaves are usually used to make flavored tea products in the form of tea bags, matcha and iced tea, as on their own these leaves usually taste awful.
A 2005 study raised concerns about instant iced tea. A middle aged woman was diagnosed with skeletal fluorosis for drinking up to 2 gallons of iced tea daily. Why? Because her green tea contained too much fluoride.
University of Derby also reported on a study that found that economy tea bags from supermarket brands can contain dangerous concentration fluoride, making UK people susceptible to fluorosis.
Laura Chan, who carried out the study for her PhD at the University of Derby, said: "The tea plant, Camellia sinensis, is a fluoride accumulator, with mature leaves accumulating most of the fluoride."
"When tea is harvested, these older leaves may be used to produce lower quality, stronger teas such as economy teas, whereas the bud and newer top leaves are used in the manufacture of higher grade and speciality tea products."
When you have or are prone to forming kidney stones:
Kidney stones are mineral deposits made up of calcium, uric acid or the amino acid cysteine. At least three quarters of kidney stones are composed of calcium combined with phosphate or oxalic acid. Tea is a concern because it is rich in oxalic acid.
However, contrary to expectations, recent studies suggest that while black tea contains oxalic acid, green tea actually contains very little oxalic acid. In addition, green tea inhibits urinary stone formation and prevents kidney stones!
Cough Or Blocked Nose:
If you are healthy and are drinking green tea to help boost your immunity, you are probably doing the right thing. Scientific studies have found tea to protect you against virus and bacteria.
However, if you are already suffering from cough and blocked nose, drinking tea would probably make thing worse.
In Traditional Chinese Medicine, green tea is considered cooling and damp.
My experience is that drinking green tea stimulates mucous and phlegm production. It makes you want to cough or it could make your blocked nose worse.
Beware Of Slimming And Weight Loss Teas:
There are many kinds of Chinese slimming and weight loss teas. While green tea is considered safe for long term consumption, slimming and weight loss teas that contain stimulant laxative herbs such as senna leaf and rhubarb root are especially dangerous when consumed in large quantity.
The FDA is on red alert. There have been 4 case reports of young women who died, of which herbal diet tea may be a contributing factor.
When You Are On Medication Or Have a Medical History:This is perhaps the most important side effect of which to be aware.
Green tea, like any other tea beverages, can interfere and interact with certain medications. It is wise to avoid drinking any tea beverages 2 hours after taking medications.Liver Disease:
Take care if you have severe liver disease, as the level of caffeine in the blood may build up and last longer.
Finally, if you have any other health concerns, play it safe. Consult with your health adviser before drinking green tea
Source:Google
Beware Of Slimming And Weight Loss Teas:
There are many kinds of Chinese slimming and weight loss teas. While green tea is considered safe for long term consumption, slimming and weight loss teas that contain stimulant laxative herbs such as senna leaf and rhubarb root are especially dangerous when consumed in large quantity.
The FDA is on red alert. There have been 4 case reports of young women who died, of which herbal diet tea may be a contributing factor.
When You Are On Medication Or Have a Medical History:This is perhaps the most important side effect of which to be aware.
Green tea, like any other tea beverages, can interfere and interact with certain medications. It is wise to avoid drinking any tea beverages 2 hours after taking medications.Liver Disease:
Take care if you have severe liver disease, as the level of caffeine in the blood may build up and last longer.
Finally, if you have any other health concerns, play it safe. Consult with your health adviser before drinking green tea
Related Poste:
Green Tea
The publication of this information does not constitute the practice of medicine, and this information does not replace the advice of your physician or other health care provider. Before undertaking any course of treatment, the reader must seek the advice of their physician or other health care provider
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Thank you for providing this valuable information about the green tea while the net and world continue to make tall claims about the beverage.
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