There's no doubt that green tea does have a lot of health benefits, but if consumed in excess it can lead to many unwanted health problems too. Here's why you should not overdo the consumption of green tea:

1. You might end up with headaches because of the caffeine present in it. 

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2. Too much consumption leads to insomnia

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3. Excessive consumption of green tea increases the caffeine level in the body leading to irregular heartbeats

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4. It can lead to nausea and vomiting

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5. Consuming green tea in excess weakens bone health and lead to osteoporosis

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6. You might end up with diarrhoea

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7. Extra doses of green tea can cause vertigo or dizziness

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8. High dosage of green tea leads to iron deficiency

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9. Overconsumption leads to glaucoma and/or puffy and inflamed eyes.

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10. A study suggests consuming green tea in excess may lead to high blood pressure levels

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11. According to research, caffeine content present in green tea can give you muscle spasms

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12. It leads to Type 2 diabetes if consumed in excess, according to a research

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13. Polyphenols present in green tea cause kidney damage

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14. It leads to staining of teeth because of the presence of tannins

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15. excess consumption could lead to a drop in fertility levels as well as a decrease in serum testosterone levels. 

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Remember, the word is moderation!