Denise,
As far as I know, in the Atkins regimens, fiber carbs are not counted.
Fermentable fiber supplements are metabolized to generate short chain
fatty acids. You can use Methocel if you want a non-fermentable
supplement, but now we're talking chemicals and not natural products.

In my own diet, I use guar gum (Benefiber), which is a fermentable
fiber supplement. It has only 20 cal per 6 g, and you only need about
8-12 g/day to have a good effect.

Atkins was worried about the effect of quickly metabolized carbs on
insulin release and triglycerides, among other issues. Fiber
supplements don't have these problems, or work in a helpful way.

See this link (maybe more than you want to know!)
http://members.ift.org/NR/rdonlyres/...ms20001598.pdf

JT