You've probably heard that green tea has many health benefits, and research backs it up. It has antioxidant and anti-inflammatory properties due to its rich content of micronutrients known as catechins. They help protect and heal the body from various conditions such as colds, flu, and cardiovascular problems. However, like many good things have their drawbacks, green tea is no exception. In this discussion, we'll take a look at it side effects.
Side effects of green tea
- May get too much caffeine
Although green tea is lower in caffeine compared to other types of tea, it does contain significant amounts. For this reason, too much green tea can affect your nervous system. Avoid taking more than 3 to 5 cups per day.
Note that too much caffeine can lead to palpitations, insomnia, poor appetite, irritability, and restlessness. Also, drinking too much green tea can cause caffeine intolerance, so you'll need to take more to get the same effect you previously had with less.
- Not good for a sensitive stomach
If you have a sensitive stomach, avoid green tea or take Not a large number of. And don't take the tea on an empty stomach. Green tea can cause stomach problems such as diarrhea, constipation, irritable bowel syndrome, and abdominal pain. If you have stomach problems after drinking green tea, adding milk and sugar may reduce the problem.
- May increase toxicity levels
Recent studies done on dogs show that taking green tea on an empty stomach can cause toxicity in the stomach, liver, and kidneys. Although human studies have not been performed, it is safer to ensure that you eat before drinking green tea to reduce the effects of this among other side effects of green tea.
- May react to some drugs
Green tea contains phenophiles that can react with certain chemicals in medications, including ephedrine and amphetamines. For this reason, if you are taking any medication, check with your doctor before taking green tea.
- May interfere with iron absorption
The catechins in green tea can inhibit the absorption of iron in the body. This can lead to a reduction in the production of red blood cells. It is worth noting that red blood cells carry oxygen to various organs and areas of the body. When your body's number of red blood cells drops, you may suffer from anemia. If you already have anemia, drinking large amounts of green tea may make your condition worse. To avoid this, you need a moderate intake of green tea and food intake, rich in vitamin WITH.
- May cause harm during pregnancy
If you are pregnant, limit your green tea intake to no more than 2 cups, which contain about 200mg of caffeine in addition to tannic acid and catechins. These chemicals pose a risk of miscarriage.
Avoid green tea completely in the early months of pregnancy because excess consumption tea can cause your unborn baby to develop a congenital tube defect. Avoid excessive consumption of green tea even after your baby is born and until you stop breastfeeding.
- May lead to calcium deficiency
This is one of the side effects of green tea. If you have a habit of taking an excessive amount of green tea, you can consume 300 mg or more of its components. This can cause your body to excrete calcium in your urine and eventually lead to conditions like osteoporosis. This is more common in women. It is recommended to take a calcium supplement to replace the ulcerated calcium.
- May lead to stained teeth
In addition, green tea contains tannins, which can also stick to teeth and stain them. The acid in green tea wears away tooth enamel. Also note that other substances such as coffee, black tea, berries, wine, sauces and juices can stain teeth. However, you can always keep an eye on staining, brush your teeth regularly and brush your teeth with your teeth and especially after drinking green tea.
- May cause glaucoma
The term glaucoma refers to diseases that affect the optic nerve, which provides communication with the brain. Damage can occur due to increased pressure in the eye. The caffeine caused by consuming too much green tea can lead to high pressure in the eyes and increase the risk of poor vision in people with glaucoma.
- May lower testosterone levels
Drinking too much green tea can lower testosterone levels in men's blood since certain compounds in tea react with testosterone and thereby convert it into DHT (dihydrotestosterone), which has been linked to hair loss. Of all the side effects of green tea, this one may be the most worrisome for men.
How to drink green tea to avoid possible side effects
Drinking green tea in moderation is generally safe for most adults. However, if you have stomach problems, low caffeine tolerance, iron deficiency, are pregnant or nursing, you should avoid green tea. Those with anemia, bleeding tendencies, anxiety disorders, heart disease, liver disease, osteoporosis, and diabetes should also avoid green.
Experts recommend taking no more than 3 or 4 cups. Please note, however, that these are only guidelines as the actual amount of tea added to a cup varies. Moreover, if people with certain health conditions take green tea, it may make them feel worse. For this reason, it is recommended that such people take a maximum of 2 cups per day.
Remember that despite the side effects of green tea, it also has many health benefits.
Harm green tea- the last thing the apologists of this really tasty and healthy drink want to hear. Green tea can be drunk always and for everyone, millions of people are sure! And yes - green tea is one of the most popular herbal drinks due to its purported health benefits, including weight loss. Although the benefits of green tea have been scientifically proven in one, but not in another. When consumed in moderation, green tea is generally considered safe for adults.
People with low level caffeine tolerance, can feel the harm of green tea even when drinking a small amount of the drink. In addition, people with certain health problems may only worsen their condition by drinking green tea. In this case, it is recommended to limit daily consumption green tea up to two cups.
This article is about potential harm of green tea is based on the facts of the UK Tea Council (UK Tea Council): someone who, and the British are very kind to tea and send to the study of this drink, probably as much scientific potential as no one else in the world.
When green tea is bad: 19 side effects of green tea
Typically, side effects of green tea consumption are associated with caffeine, which, when ingested in large quantities, can lead to exacerbation and various health problems
1. Harm of green tea for stomach problems
Avoid drinking green tea on an empty stomach because it increases the acidity of the stomach, increasing the risk of nausea, stomach pain and constipation due to the tannins it contains.
The best time to drink green tea is between meals or after meals. People with acid reflux or peptic ulcers should not drink green tea in excessive amounts. According to a 1984 study, green tea is a strong stimulant of stomach acid. Scientists have found that adding milk and sugar to tea can reduce these stimulating properties of stomach acid.
It is correct to brew green tea at a temperature between 70 and 90 degrees Celsius, as in some cases the high temperature of green tea brewing can cause side effects. Use too hot water contributes to indigestion or heartburn.
2. How to drink green tea with iron deficiency and anemia
Apparently, green tea reduces the absorption of iron from food, so consuming too much green tea can be hazardous to health. By the way, the lethal dose of caffeine in green tea is considered to be 10 to 14 g (150 to 200 mg/kg).
What's more, green tea reduces the absorption of non-heme iron, which is found in dairy products, eggs, beans, and others. food products plant origin. According to a 2001 study, tea reduces the bioavailability of this type of iron by 25 percent. To prevent this, you need to squeeze a lemon into a cup with green tea or add vegetables or fruits rich in vitamin C to your diet, as this vitamin improves the absorption of non-heme iron. Products with high content vitamin C - lemon, broccoli, dark greens, tomatoes, etc.
According to the UK National Cancer Institute, best time to drink green tea if you are anemic between meals.
3. Green tea and headache
Scientific studies have shown that caffeine increases the risk of chronic daily headaches.
4. Green tea can cause anxiety, nervousness and sleep problems
Caffeine is a stimulant and a derivative of the purine base xanthine. Depending on xanthine sensitivity, which is individual, caffeine can cause anxiety and sleep problems. This purine base blocks sleep hormones in the brain and increases the secretion of adrenaline.
5. Irregular or fast heartbeat
6. Diarrhea
Since caffeine relaxes the muscles in the colon, it promotes peristalsis. Due to this laxative effect, green tea may be contraindicated for some people.
7. Vomiting
Caffeine can even cause nausea because it can affect the movement of food through the esophagus by relaxing the muscles in the esophagus.
8. Heartburn
Due to the ability of caffeine to stimulate the secretion of acid in the stomach, green tea can lead to an unpleasant condition similar to heartburn.
9. Muscle tremor
Caffeine can regulate calcium channels in cells, thus causing muscle tremors.
10. Dizziness
Caffeine can even cause dizziness and motion sickness because it reduces blood flow to the brain.
11. Ringing in the ears
12. Seizures
Too much caffeine can stimulate the central nervous system, activating neurons, leading to seizures.
13. The harm of green tea in diabetes
Since caffeine can affect your blood sugar levels, you need to monitor it carefully if you have diabetes and consume green tea on a regular basis.
14. Bleeding
15. The harm of green tea in glaucoma
Intraocular pressure rises within 30 minutes after drinking a cup of green tea; the effect lasts about 90 minutes.
16. The harm of green tea in liver diseases
Medicine knows cases when liver disease is associated with green tea extract. Apparently, the caffeine found in green tea can build up, thereby exacerbating an existing liver problem.
17. High blood pressure and the harm of green tea
Another side effect of caffeine from green tea is the ability to increase blood pressure blood, which is already high. But someone who drinks green tea or some other caffeinated drink on an occasional basis shouldn't have this problem.
18. How to drink green tea for osteoporosis
Green tea can increase the excretion of calcium through the urine, thus contributing to the development of bone problems such as osteoporosis, especially in patients at increased risk for this disease. They should limit their daily caffeine intake to less than 300 milligrams, that's two to three cups of green tea, and take calcium supplements.
19. Harm of green tea during pregnancy. How to drink green tea during pregnancy
Green tea drink contains caffeine, tannic acids and catechins - all three substances are associated with the risk of pregnancy. Pregnant and lactating women are advised to limit their daily intake of green tea to 2 cups per day, which is about 200 milligrams of caffeine. More green tea consumption may increase the risk of miscarriage.
Problems related to nutrient absorption in children
Green tea contains tannins, which can block the absorption of proteins and fats in children. On the other hand, the caffeine content can lead to overstimulation.
Can I drink green tea while taking medication?
Green tea can cause side effects when consumed with the following medications and substances:
Weak connection
Fluconazole, alcohol, antidiabetic, Terbinafine and Mexiletine (Mexitil).
Moderate connection
Quinolone antibiotics, adenosine, contraceptives, Clozapine (Clozaril), Cimetidine (Tagamet), Dipyridamole (Persantine), estrogen tablets, Disulfiram (Antabuse), Fluvoxamine (Luvox), depression medications, lithium medications, Hepatotoxic drugs, Phenobarbita (Nembutal) , Antiplatelets/anticoagulants, Phenylpropanolamine, Theophylline, Riluzole (Rilutek), Warfarin, and Verapamil.
strong connection
Ephedrine, Amphetamines, Cocaine, Nicotine and other stimulants.
How much green tea to drink per day
According to the UK Tea Council, we should not drink more than six cups of green tea a day. In fact, the organization's experts say that 3-4 cups of green tea provides the health benefits of green tea. Drinking up to 5 cups of green tea a day is considered safe. People in Asian countries typically consume 3 cups of green tea per day, which provides them with 240 to 320 mg of polyphenols, the active ingredients in this drink.
The most common way to brew green tea is to add a teaspoon of green tea leaves to a glass of boiled water.
Let the tea cool down a bit before enjoying it. Drinking too hot tea is thought to contribute to the development of throat cancer, while scalding tea can damage the digestive system. It is always best to consume freshly brewed tea to get the most of its health benefits because the compounds in it like vitamins C and B, theanine and catechins decrease over time due to oxidation. If you are re-steeping tea leaves, make sure you do so in moderation, as they can release harmful and even cancerous substances with each successive steaming. Also, the antibacterial properties of this tea decrease over time, so old tea can contain harmful bacteria.
Conclusion: when green tea is harmful
If you are taking any of these medications or if you suffer from any of the conditions listed above, be careful when drinking green tea and consult your doctor for the recommended dosage. daily dose green tea. In general, you should not stop drinking green tea, just remember that moderation is always the key to health.
Denial of responsibility: The information provided in this article is about how to brew and drink green tea, is intended for the information of the reader only. It cannot be a substitute for the advice of a health professional.
And tannins, which in large quantities cause insomnia and headaches. For the average person, caffeine intake should not exceed 300 mg per day. Tannin belongs to the category of anti- nutrients. This means that it interferes with the penetration into the body of some useful substances, for example, calcium. That is why it is useful to add some milk to tea so that the calcium contained in it has time to enter the body. On the other hand, milk contains casein, which robs the beneficial antioxidants in tea of their power.
One or two cups of strong tea a day won't hurt. But if you are addicted to strong tea, then this amount is no longer enough. And then the harm from it is much more than good.
A lot depends on the quality of the tea. Some manufacturers deliberately neglect the norms and add special impurities to the tea, which color the tea leaves and make it stronger. And such a "strong" tea especially. Recognize the difference between tinted and natural tea you can dip the bag in cold water. If tea colors water, then it harmful dyes.
Very strong tea in large quantities affects the color of the skin, and it turns yellow.
From a large amount of strong tea you can. At the same time, there are headache, nausea, dizziness, abdominal pain, surrounding objects are perceived as blurry, coordination of movements is disturbed. The reason for this is that tea regulates blood sugar levels. Drinking strong tea in moderation can prevent diabetes. Too much strong tea causes the body to store and limit sugar, and you begin to miss it.
In this case, you should stop drinking tea and eat or drink something to increase the level of sugar. It can be ice cream, condensed milk, sweet cookies or bread and butter.
If you are a strong tea lover and like to drink it often, it is better to stick to one type of tea and make sure that the amount of tea leaves brewed does not exceed 20 g per day.
It is better to drink weak tea. It is much more useful than strong in the long run.
Useful properties of strong tea
On the contrary, if you drink strong tea in small portions, then it is huge. Strong tea gives a charge and energy not worse than coffee. He is what high temperature body, eliminates the influence of poisons, nourishes the lungs, cleanses the mucous membranes, stimulates urination, helps the body digest fats.
In addition, strong tea sobers up a person in a state of alcohol intoxication. Caffeine signals the kidneys, which perform a cleansing function.
Green tea is considered very beneficial for health. This is true, but in everything you need to know the measure: it is not recommended to drink more than 5 cups a day.
In addition, like all teas, green tea contains caffeine. If you have a caffeine intolerance, limit yourself to 2 cups.
Excessive caffeine intake can cause or exacerbate a range of health problems, including:
Disorders of the stomach.
Therefore, the Japanese and Chinese never drink green tea on an empty stomach.
Iron deficiency and anemia.
Green tea reduces absorption gland from food. Iron deficiency can lead to disease (such as anemia).
A very large dose of green tea can be fatal!
Lethal dose caffeine in green tea is estimated at 10-14 g (150-200 mg/kg).
Headache.
Research shows that caffeine- a risk factor in the occurrence of chronic daily headaches.
Sleep disturbances, nervousness and anxiety.
Caffeine obviously affects anxiety and sleep, although the effect depends on individual sensitivity to methylxanthine. It blocks sleep-inducing substances in the brain and increases the production of adrenaline.
Irregular or fast heartbeat
Caffeine in green tea can cause cardiac arrhythmias. In addition, it stimulates the heart muscles to contract.
Vomit.
Because the caffeine affects the flow of blood through the esophagus, the alternating contraction and relaxation of the muscles of the esophagus can cause nausea.
Diarrhea.
Caffeine has a laxative effect. It promotes peristalsis (the movement of food through the digestive system) and stimulates the muscles in the colon.
Muscle tremor.
Caffeine causes contractions skeletal muscle, negatively affecting the channels calcium ions in cells.
Heartburn.
Caffeine increases production gastric juice. This can lead to heartburn.
Dizziness.
caffeine can reduce blood flow to the brain which leads to dizziness and motion sickness.
Tinnitus.
Caffeine can aggravate tinnitus(tinnitus).
Convulsions.
Caffeine stimulates the central nervous system by activating neurons, which can cause convulsions if consumed in excess.
Bleeding.
The caffeine in green tea may increase the risk of bleeding.
Diabetes.
The caffeine in green tea can affect blood sugar levels. If you are a diabetic and drink green tea, watch your sugar levels.
Glaucoma.
Green tea increases intraocular pressure. This happens 30 minutes after consumption and lasts at least 90 minutes.
High pressure.
The caffeine in green tea can increase blood pressure. However, this effect is not observed in those who drink green tea (or other caffeinated drinks) regularly.
Liver diseases.
Green tea extract may exacerbate liver failure by promoting the accumulation of caffeine in the blood.
Osteoporosis.
Green tea may increase calcium leached out in the urine, which is bad for bone health and can lead to osteoporosis, especially in predisposed people.
Limit your caffeine intake to 300 mg per day (approximately 2-3 cups of green tea).
Risk for pregnant women and infants.
Green tea contains caffeine, catechins and tannins. All these substances are dangerous during pregnancy.
Nutritional absorption in children.
The tannins in green tea can interfere with the absorption of proteins and fats in children. In addition, caffeine can lead to overstimulation.
Nikita Skorobogatov
Generally speaking, green tea is very healthy drink with numerous benefits. However, some people may experience negative side effects from their use. These can include nausea, increase your risk of osteoporosis, and more. Find out about these potential risks and ways to mitigate/reduce them.
Side effects of caffeine in green tea.
Those who are sensitive to or simply consume large amounts of green tea may experience side effects from caffeine. In general, green tea has much less caffeine than any other tea. However, some types green teas(such as Matcha) may contain a little more of this substance than, for example, classic or even. Therefore, excessive consumption of green tea can cause anxiety, heart palpitations, insomnia, irritability and increased blood pressure. People sensitive to the effects of caffeine are more susceptible to this type of side effect.
However, the good news is that you can easily reduce these side effects by drinking a little less green tea, or by choosing a drink with much less caffeine.
In addition, it is worth noting that green tea has a natural chemical called theanine, which has a calming effect on the brain and reduces the effects of caffeine.
Green tea, indigestion and nausea
Like other types of tea, green contains. For example, "tannins" are natural chemical which stimulates the stomach to produce more acid. if you have peptic ulcer stomach or acid reflux problems, green tea can cause indigestion or nausea. And if you suffer from diarrhea, then tannins can also worsen the condition.
You can reduce or even eliminate this side effect by consuming green tea after a meal or simply when your stomach is not completely empty. Of course, it is worth noting the fact that the content of tannins in green tea is much less than, for example, in black.
Effects of green tea during pregnancy.
Green tea is often consumed during pregnancy in China and Japan, as it is generally believed to be safe for both mother and baby. However, some doctors advise against consuming any caffeinated beverages during the first weeks of pregnancy because it can affect the neural connections of the fetus.
What to do if you are experiencing the side effects of green tea… If you experience any side effects, consult your doctor about reducing or eliminating green tea from your diet.
Should you drink green tea?
Side effects from green tea are very rare, and usually only occur when a person consumes large amounts of green tea or has an underlying medical condition. IN general benefit for health far outweighs the risks.
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