"Pouring" all this green tea into my body (besides forcing me to make numerous stops at the restrooms during the day) got me thinking: “Is it possible that I'm abusing it?"
The magic of green tea comes from its high content of catechin polyphenols, particularly epigallocatechin gallate (EGCG). EGCG is a powerful anti-oxidant. Besides inhibiting the growth of cancer cells, it kills cancer cells without harming healthy tissue. It has also been effective in lowering LDL cholesterol levels, and inhibiting the abnormal formation of blood clots. The latter takes on added importance when you consider that thrombosis (the formation of abnormal blood clots) is the leading cause of heart attacks and stroke.
However, are there any side effect coming from consuming green tea? To put it differently, is there anything like too much green tea?
I did some research and found that the answer is: NO.
There are of course some side effects deriving from green tea caffeine content, but besides that it’s safe to drink green in large quantities.
When it comes to green tea extract supplements, one should take into consideration the implications that a really high quantity of one substance can cause.
Are there any documented side effects of excessive green tea consumption?
In some people, green tea can cause stomach upset and constipation. Also, green tea extracts have been reported to cause liver problems in few cases.
It has been claimed that too much green tea — more than five cups per day— can be unsafe because of the caffeine.
These side effects can range from mild to serious and include headache, nervousness, sleep problems, vomiting, diarrhea, irritability, irregular heartbeat, tremor, heartburn, dizziness, ringing in the ears, convulsions, and confusion.
Let’s not forget that green tea contains 15-40 milligrams of caffeine per cup which is very low if compared to the average cup of black tea at 40-80 milligrams, instant coffee at 50-100 milligrams per cup, drip coffee at 100-200 milligrams per cup, espresso at 100 milligrams for only two ounces (that’s 400 mgs. for the same 8 ounces), soft drinks currently vary from 0 to 80 milligrams per 8 ounces, new energy/sports drinks average 80 milligrams every 8 oz.
So what are we really talking about? I mean, it seems to me that we are trying to find a mole in a product that it’s almost perfect.
Coffee drinkers should be careful with caffeine content not green tea drinkers.
Finally there’s some evidence (however limited) that green tea seems to reduce the absorption of iron from food and may interact with some medications (but again the interaction is caused solely by caffeine nothing else).
After all this research my call is: I'll keep drinking green tea in large quantities, no matter what.