When consumed in excessive amounts, green tea has been linked to a slew of issues, including heart disease. For people with certain diseases, it might create difficulties.
1. Stomach Problems
Green tea has tannins in it, which can cause stomach aches, nausea, and constipation. Due to the tannins present, green tea should not be consumed on an empty stomach. After a meal or between meals, green tea is preferable. People who have peptic ulcers or acid reflux should avoid drinking large quantities of green tea. According to a study published in 1984, tea raises gastric acid activity significantly and may be lowered by adding milk and sugar.
2. Iron Deficiency
Green tea appears to hinder the absorption of iron from food. Caffeine in high doses can be fatal. The toxic dose of caffeine in green tea is thought to be 10–14 grams (150–200 mg per kg). Green tea extract has been found to reduce non-heme iron absorption by 25%. Non-heme iron is the most prevalent form of iron in eggs, dairy products, and plant meals like beans. As a result, drinking green tea with these foods might cause you to absorb less iron. Vitamin C, on the other hand, enhances non-heme iron absorption. You may add lemon to your tea or eat other vitamin-C-rich foods like asparagus with your dinner in order to increase non-heme iron absorption. The National Cancer Institute found that drinking tea between meals has little impact on iron absorption.
3. Caffeine Caution
Green tea, like all teas, has caffeine, and excessive coffee drinking can cause nervousness, anxiety, altered heart rhythm, and tremors. Some people have a reduced sensitivity to caffeine and may experience these symptoms even when ingesting small amounts. Caffeine consumption in excess of 5 cups per day can impair calcium absorption and raise the risk of osteoporosis by inhibiting bone health. To assist with caffeine-related issues, stick to 5 or fewer cups per day.
4. Pregnancy and Breast-Feeding
Green tea has caffeine, catechins, and tannic acids. Caffeine, catechins, and tannic acids have all been linked to increased pregnancy risks. Green tea in tiny amounts (about 2 cups per day) is safe during pregnancy or breastfeeding. This amount of green tea contains about 200 mg of caffeine. Drinking more than 2 cups of green tea each day, on the other hand, is dangerous and has been linked to an increased risk of miscarriage as well as other drawbacks. It’s also hazardous for a nursing infant if you consume a lot of coffee. Additionally, drinking a lot of coffee might cause neural tube birth defects in babies.
Green tea catechins can hinder the absorption of iron from food. If you have an iron deficit, as in anemia, the National Cancer Institute recommends consuming tea between meals. Studies show that if you enjoy drinking green tea with your meal, studies show that eating foods that boost iron absorption is a good idea. Meats like red meat and citrus fruits are high in iron.
6. Anxiety Disorders
Green tea contains caffeine, which is thought to exacerbate anxiety.
7. Bleeding Disorders
Caffeine in green tea may cause bleeding.
8. Heart Conditions
Caffeine in green tea might cause irregular heartbeat.
Caffeine in green tea has been linked to changes in blood sugar regulation. If you consume green tea and have diabetes, keep an eye on your blood sugar levels.
10. Diarrhea and IBS
Green tea contains caffeine, which may aggravate symptoms of IBS. In particular, drinking a lot of green tea can cause diarrhoea and the IBS-like symptoms mentioned above.
Green tea consumption puts increased pressure on the eyes. Within 30 minutes of drinking green tea, there is an increase in pressure within the eye that lasts at least 90 minutes.
12. Should not be given to Children
The tannins in green tea might bind to nutrients such as protein and fats and prevent their absorption in children. Because of the caffeine present in green tea, it may also cause overstimulation.
13. Liver Disease
Green tea extract pills have been connected to a number of cases of liver damage. Green tea extracts might exacerbate the liver disease. The amount of caffeine in the blood may increase with severe liver illness, and it may stay for longer.
Green tea drinking has been shown to increase the amount of calcium excreted in the urine. Caffeine should be avoided at a maximum intake of 300 mg per day (approximately 2-3 glasses of green tea). Calcium supplements may help to compensate for some calcium loss caused by caffeine.