Why is green tea not included in the drinks to be avoided. I thought green tea also contains caffeine.
If you want a caffeine free tea that tastes well (imo), consider Rooibos tea. It contains no caffeine whatsoever: http://en.wikipedia.org/wiki/Rooibos
I also drink coffee sometimes. And even though both contain caffeine there is big difference. When I talk about tea's wake-fullness it is more like alertness, a much more gradual and pleasant effect than coffee. Coffee is like having someone constantly slapping me on the face. It is more noticeable and it is too distracting. But I also happen to like the taste of a good cup of coffee so I drink it then quit after a while, get headaches, go back to my tea and then after a month of two do it again.