Thank you for your question. I too really enjoy coffee, but limit my intake to a large cup in the morning. I have enjoy a cup of green tea while working for the following reasons.
Green tea is one of the less processed types of tea and therefore contains one of the most antioxidants and beneficial polyphenols. Only white tea is the least processed type of tea.
In general, green tea contains a relatively small amount of caffeine compared with black tea and coffee. Unsweetened green tea is a zero calorie beverage.
According to the National Cancer Institute, the polyphenols in tea have been shown to decrease tumor growth in laboratory and animal studies and may protect against damage caused by ultraviolet UVB radiation.
A 2006 study published in the Journal of the American Medical Association concluded that green tea consumption is associated with reduced mortality due to all causes, including cardiovascular disease.
Green tea was used in traditional Chinese and Indian medicine to control bleeding and heal wounds, aid digestion, improve heart and mental health and regulate body temperature.
Above information is attributed to medicalnewstoday.com
Enjoy a cup of green tea:)