Studies have shown that consuming 3 to 4 glasses of green tea per day can reduce fatigue. Despite all the benefits mentioned for green tea, caffeine is a natural stimulant and each 240 ml glass of tea contains about 30 mg of caffeine.
The effects of caffeine take 20 minutes to start and reach their peak an hour after consumption. Therefore, drinking green tea before going to sleep disturbs the ability of people to sleep. People will also have to empty their bladder during the night and this reduces the quality of their sleep.
Therefore, it can be said that drinking green tea at night can turn this useful drink into a harmful one and reverse its effectiveness in improving people’s sleep system.
Read more: Green Tea Benefits
Stomach problems with green tea consumption
Caffeine can be the most common cause of these problems. Although the amount of caffeine in green tea is less than other types of tea, it can still cause problems. Because caffeine increases the amount of acid involved in the digestive process. This can cause pain or nausea.
Green tea before bed causes bleeding disorders
One of the disadvantages of green tea is that the caffeine in green tea can increase the risk of bleeding. That is why if you have a bleeding disorder you should avoid using it.
Iron deficiency and anemia with green tea consumption
According to a Taiwanese study, one of the disadvantages of green tea is that excessive consumption of green tea can lead to iron deficiency anemia. More importantly, consuming green tea after iron-rich food causes the main components of tea to bind to iron. If this happens, green tea loses its ability as an antioxidant.
Read more: Green Tea For Weigh Loss
One of the disadvantages of green tea is that, according to a study, green tea extract significantly increased the risk of seizures in experimental mice. Tea had always increased the duration of seizures.
Side effects of green tea in causing headaches
Again, due to the presence of caffeine, green tea may cause mild to severe headaches. Headaches can also be caused by iron deficiency and, as we saw earlier, can be caused by too much green tea.
An important point to remember is that although green tea extract is available in more than 100 over-the-counter herbal supplements, its use as a treatment for any disorder is not fully approved by the FDA.
Tinnitus by drinking green tea
According to the American Tinnitus Association, drinks that contain caffeine can make tinnitus worse. Green tea, as one of the sources of caffeine, can lead to this disorder.
Another adverse effect of green tea is causing sleep problems. You can avoid this problem by limiting the consumption of green tea, because the effective dose of caffeine in green tea to affect the quality of sleep is 10 to 14 grams per day.
Again, it’s the caffeine’s fault. Caffeine also stimulates the heart. This substance causes your heart rate to increase rapidly, resulting in a rapid and irregular heartbeat – a condition called tachycardia. This disorder can make you feel like your heart is pounding in your chest.
In fact, you feel the heartbeat more than usual. This disorder, also called palpitations, can even cause chest pain or angina pectoris. Changing your normal heart rate can be a serious threat to your health.
According to a study conducted in India, one of the disadvantages of green tea is that the polyphenols in green tea can cause oxidative stress. Consuming too much caffeine, including caffeine in green tea, can cause nausea and vomiting.
Excessive caffeine consumption is associated with spasms and muscle tightness. And people with abnormal sinus rhythm should limit caffeine intake.
Caffeine is also said to be associated with restless leg syndrome. If you suffer from this disorder in a mild to moderate level, it is better to pay attention to the amount of green tea (or caffeine) you consume.
Green tea is acidic, so it can irritate the lining of the esophagus and cause acid reflux or heartburn. If a person is prone to heartburn (or acid reflux), the disorder can get worse.
Increase in diabetes at night with green tea consumption
Studies that have used green tea, its extract, and catechin (the main component of green tea) have shown disappointing results in the treatment of type 2 diabetes. When studies were conducted on the effect of this tea on the protection of healthy people against this disease, similar results were obtained.
The caffeine in green tea also acts as a natural diuretic. According to reports, consuming 5 cups of green tea per day (or 200 to 300 mg of caffeine per day) can be a solution.
Read more: Pear Tea Recipe
- Monoamine oxidase inhibitors
How much green tea is safe to consume?
The ideal dose of green tea is 3 to 5 cups per day, which is about 1,200 ml (or 250 mg of catechins). Never drink green tea on an empty stomach as it may cause liver toxicity.
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