What's so bad about coffee?
Coffee is also know to increase the acidity levels in the blood causing the body to pull calcium from your bones and teeth to compensate which leads to an even higher risk of osteoporosis. (1)
It will interfere with your body’s ability to use folate (B9), and vitamins B12 and B6a. Nutrients which are important in keeping homocysteine levels in the healthy range. Elevated homocysteine levels are associated with a number of serious disease conditions. (2)
Coffee can also create insomnia, raise blood pressure, raise stress hormone levels, increase symptoms of anxiety, cause heart palpitations and deplete the body of iron.
What's so good about green tea?
Never substitute water for green tea as this is always the best choice but having 3 cups a day of an organic pesticide free green leafed tea according to most of the research is beneficial for receiving the health benefits however if you are pregnant or breastfeeding it is best to avoid all caffeine. (1)
(1) http://articles.mercola.com - Is Drinking Tea or Coffee the Smarter Choice?
(2) http://en.wikipedia.org/wiki - Homocysteine
Coffee Beans In Jar Stock PhotoBy nuchylee, published on 13 April 2012 - image ID: 10079939
Green Tea Stock PhotoBy zirconicusso, published on 21 May 2013 - image ID: 100169105