No, I have never heard it be a problem.

is decaf green tea ok, or does decaf process substantially alter the teas nutrients?

There are many great benefits to green tea, and while some of the phytochemical properties are reduced in the decaffeinating process, there are still plenty of antioxidants left once the caffeine is removed. You might consider drinking regular green tea more diluted or earlier in the day to get the full benefits, but decaf will still offer some value to your health. -Coach Zoe