I'm so glad I found this post. This makes so much sense. I'm a very active and fit person that takes pride in my health. I gave up my coffee habit less than 8 weeks ago and replaced it with many cups of fresh brewed green tea leaves from morning to evening. Roughly 6-8 12oz cups a day. My left knee feels as if its being stabbed with a hot coal poker. Also, all of my joints have been cracking and popping. Ankles, knees, hips, back, neck, shoulders, elbows and wrists. I'm immediately going to cut back to 1 cup for breakfast and see if there is improvement before I seek medical opinions. Thank you all for enlightening me with the previous threads!!!! Too much of a good thing can most likely be bad for you!