If there is one thing that the fitness world is obsessed with then it is, without any further doubt ‘THE GREEN TEA’. Known for its rich antioxidants and low caffeine content and its ability to keep your body refreshed throughout the day green tea has definitely come a long way. Green tea has many other health benefits too, and that is the reason it is claimed to be the healthiest tea ever by far. Agreed, but we do know in this world nothing is perfect, green tea is neither.
Approximately four in five consumers drink tea, with Millennials being the most likely (87% of millennials drink tea).
Though in less amount green tea contains caffeine, it might have several adverse effects on your body. Green tea indeed has a few side effects especially if you are intolerant to caffeine. As the saying goes ‘Better safe than sorry’, it is always better to be cautious than to regret a hasty decision. So before you grab your cup of green tea today skim over this article to know some unknown side effects of the ‘well known’ green tea.
12 Green Tea Side Effects You Should Know
As mentioned earlier green tea contains caffeine, though it is in lesser amount compared to traditional green tea, it might cause mild to severe headaches.
These headaches might also be due to iron deficiency; yes you read it right, iron deficiency. Green tea reduces the absorption of iron from the food by the human body. Hence headaches may be caused due to this also.
As already stated green tea reduces the iron absorption from food and this might lead to anaemia. Anaemia in general as we all know is caused due to reduce in number of red blood cells in the body. Anaemia causes body fatigue, poor appetite, dizziness, etc. Anaemia is a severe condition and in few cases it might prove to be fatal.
Especially in case of pregnant women and children anaemia poses a severe threat and if this is due to the low or reduced absorption of iron, then green tea is doing more bad than good to your body.
3. Stomach problems
The culprit here again is the caffeine. Caffeine is known to increase the acid content in the body that aid in digestion process. Increase in levels of these acids may lead to severe pain or even nausea.
Though green tea is claimed to prevent gastric cancer, studies suggest that there are no sufficient information in this regard. So if you are experiencing usual stomach ache after consuming green tea it is best to consult your physician.
Another common side effect caused by green tea is sleep deprivation or insomnia. This is again contributed to the caffeine content in the green tea. Consuming green tea at night hours or after dinner may cause sleep deprivation which in turn may lead to a series of other problems.
5. Bleeding disorder
If you are suffering from any kind of bleeding disorder then green tea is certainly not for you. People with bleeding disorder experience problem with blood clotting. What can make it worse, the caffeine in green tea increases the risk of bleeding.
According to a study conducted by the University of Maryland Medical Center, green tea when mixed with aspirin might prevent blood from clotting.
6. High blood pressure
The flavonoids in the green tea are claimed to be healthy (of course they are) and are absorbed at a rapid rate by the body. These flavonoids along with the caffeine present in the green tea might lead to abrupt rise in blood pressure levels. A number of studies also suggest that green tea tends to elevate the blood pressure levels. This rise in blood pressure levels do not posses a severe threat, however one thing can be concluded from this; green tea is essentially not the most reliable method to regulate blood pressure levels.
An Australian university conducted a study to test if green tea reduces the blood pressure level of caffeine. The results suggest that the intake of green tea actually causes higher increase in blood pressure levels than the caffeine alone.
Yet another study suggests that the green tea might actually reduce the beneficial effects of nadolol, a medication that is used for treating high blood pressure. It is safer to take physician’s advise before using green tea if your body is prone to high blood pressure.
7. Problem in the thyroid gland
Various studies suggest than one of the components present in the green tea, catechin might affect the functioning of thyroid gland.
As per the results of a study published in the year 2003, this catechin component can cause disruption in the functioning of the thyroid gland and block the production of hormones. This in turn might lead to enlargement of the thyroid gland. Hence it is better to take advise from your doctor on green tea intake if you are being diagnosed with any thyroid related problems.
One Indian study suggest that high doses of green tea extract might cause potential impairment in the functioning of thyroid gland.
8. Heart problems
The caffeine in the green tea is known to stimulate the heart and causes the heart rate to speed up. This leads to irregular fast heart beat, a condition which is known a tachycardia. You will be able to sense your heart beat more than normal and it feels as if your heart is pounding on your chest. This condition is also known as palpitation may results in severe chest pain. Changes in your normal heart beat rate could prove to be a severe threat.
As stated already we all know that green tea is acidic and hence it can cause irritations in the esophageal lining, leading to acid reflux or heartburn. The conditions could only get worse if you are already prone to heartburn. Though freshly brewed green tea do not cause any potential heart burns the ones you find in bottled containers in the market are of real threat. This is because the most green tea that come in bottles contain preservatives that are acidic in nature such as ascorbic acid. This preservative affects the esophageal sphincter which prevents the stomach acids from rising up in the esophagus. Few varieties of green tea come with citrus flavors which makes them even more acidic.
Though studies widely suggest that green tea is actually beneficial to diabetic condition, there are a handful of studies that suggest the contrast too. A few number of studies conducted using green tea , the extracts and the catechin component showed adverse results in treating the type 2 diabetes. The results were again adverse when studies were conducted to protect healthy individuals from diabetes.
11. Bone disorders
The caffeine in the green tea is found to inhibit the absorption of various nutrients in the food one among them is calcium. To make things worse it also increases the rate at which calcium is excreted from the body. This will eventually lead to reduced amount of calcium in the bones. The reduction in calcium content in the bone would mean only one thing, it leads to bone disease like osteoporosis.
According to a study conducted by the University of Connecticut, high consumption of green tea extracts leads to lower volume, low mineral content and reduction in volume and thickness of the bone.
The common type of allergies caused by consumption of green tea are eczema and hives. In some cases individuals experience some kind of tingling sensation on the face, throat , tongue and lips.
One type of severe allergy that occurs due to green tea consumption is known as anaphylactic shock, however this kind of allergic occurrence is very rare. This type of allergic reaction causes swelling of throat, abrupt fall in blood pressure levels and severe abdominal ache and in rare cases it might also cause dizziness and anxiety.