See my post earlier in this thread above repeated here:
Yes, you are right we need both types of fiber but we need to be very careful with insoluble fiber and keep it down to small amounts. You are also right that each one of us is different and can tolerate more or less of the IF.
The point here is that if you suggest a high IF product such as barley grass powder, you should accompany it with the caveats you are suggesting now. Otherwise newbies (or others) might use the product and not be aware of the need to be careful.
Cheers.
-------------------- ibs-d (pseudo)with pain and bloating