Reged: 12/13/04
Posts: 4490
Loc: West Orange, NJ (IBS-D)
It looks like flax has both SF and IF. However, given the 1/2 ratio of SF to IF, I would emphatically NOT consider it an SFS like acacia. Here are some links I found:
http://www.expertfoods.com/FAQs/fiber-for-lowcarbers.html (Key quote: "Remember that flax seeds must be crushed or ground to get at both the soluble fiber and the beneficial oil -- otherwise they are just relatively large particles of insoluble fiber." (Emphasis mine.))