The tea contains about half the caffeine of coffee. If someone who is sensitive to caffeine may experience symptoms - like symptoms, restlessness, irritability, sleep problems, tremors, palpitations - pounding, loss of appetite, abdominal pain, nausea, frequent urination, and rash - a rash on the skin.

Patients with gastric

Tea is also bad for people with sensitive stomachs. Generally the complaint after the caffeine is stomach problems. Tea is a powerful stimulant of gastric acid, and this can be reduced by adding milk and sugar.

High risk for pregnant or lactating women

Green tea contains caffeine, tannic acid and catechin, which is very risky for the pregnancy. In addition, drinking large amounts can cause neural tube birth defects in babies. Limit your intake of green tea for pregnant women. Or if you want to minimize risk, avoid drinking green tea at all during early pregnancy for fetal health.

Hazard for patients with anemia

Tea is known as a beverage with negative calories. In addition to this tea contains no calories at all, this tea also hinder the absorption of certain nutrients. One is blocking the absorption besi.Ekstrak green tea reduces the absorption of non-heme iron by 25%. Green tea drinkers in the long run be able to develop protection mechanisms by having more severe parotic glands. Saliva is rich in protein can neutralize the harmful effects of tea tannin.

Not good for children

Advised not to drink tea for children. This is because tea contains caffeine that can stimulate excessive. contain tannins that can hamper the absorption of nutrients such as protein and fat in children.

Reduce thiamine deficiency

Tea reduces the absorption of thiamine (vitamin B). Thiamine deficiency causes a condition known as beriberi.

Make a stain on teeth

Drinking tea or coffee can cause plaque on the teeth. If plaque is not completely brushed and cleaned with dental floss within 24 hours, plaque will harden into tartar.

Trigger insomnia

Green tea may cause insomnia, so it needs to be restricted in taking for no more than 3 cups per 10 days, dangerous for people who are undergoing medical treatment. Green tea is like any other tea beverages, can interfere and interact with certain medications. Better to avoid drinking any kind of tea 2 hours after taking the drug.
Green tea contains caffeine. Caffeine can increase heart rate and blood pressure, although people who consume caffeine regularly do not seem to have an effect in the long run. Besides caffeine can also increase blood sugar levels. So diabetics must be careful if you want to consume it.
The same is true for those with psychological disorders, especially anxiety disorders or panic disorders, and hyperthyroidism.