Caffeine intolerance is the most common complaint.Green tea contains half the amount of caffeine found in coffee, so moderate consumption is unlikely to cause problems to the majority of people.
For those who are sensitive to caffeine, here are symptoms to watch out for: restlessness, irritability, sleeping problems, tremor, heart palpitations, loss of appetite, upset stomach, nausea, frequent urination and skin rash.
Experts recommend 300 milligrams of caffeine a day as being safe for most individuals. According to the United Kingdom Tea Council, this is equivalent to 6 cups a day.
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