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Not all can benefit from tea

Strong tea can make one excessively excited, which can exert adverse effects on the cardiovascular system, nervous system, etc. People with cardiovascular disease may appear tachycardia and arrhythmia after drinking strong tea.

People with constipation should not drink tea.
The polyphenols in tea have certain convergence to gastrointestinal mucosa. If constipation patients drink much tea, the condition can be worsened.

Neurasthenia and insomnia patients should not drink tea
The caffeine in tea has obvious excitation on the cerebral cortex, so patients with neurasthenia and insomnia should not drink too much tea. Or else they will be too excited to rest well.

Those with iron deficiency anemia should not drink tea
The tannic acid in tea can disturb the iron in the food from bein absorbed by the body and aggravate anemia.

People who is affected by calcium deficiency or fracture should avoid tea
The alkaloids substances could suppress the duodenum from absorbing calcium, leading to calcium deficiency and osteoporosis. For those with fracture, it can make them hard to recover.

People with cankerous disease should not drink tea
Tea contains theophylline that can reduce the activity of phosphodiesterase, making the stomach cells secrete much gastric juice. Excessive gastric juice will inevitably affect the healing of ulcers. It also can offset the curative effect of some anti-acid drug .
No drinking tea if you are affected with urinary calculi.
Tea contains much oxalic acid which can increase the development of the stone.

It is unfavorable to drink tea when there is a fever
Tea leaves contain theophylline that can raise the body temperature, offsetting the cooling effect of the drugs you take. Hence, if you are in a fever, drinking tea can be unfavorable.

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