Chemically I'm not sure, but it amounts to dietary fiber as it's not digestible by humans

From http://www.rsc.org/Education/Teachers/Resources/cfb/carbohyd...

> Carbohydrates (also called saccharides) are molecular compounds made from just three elements: carbon, hydrogen and oxygen. Monosaccharides (e.g. glucose) and disaccharides (e.g. sucrose) are relatively small molecules. They are often called sugars. Other carbohydrate molecules are very large (polysaccharides such as starch and cellulose).

I wish people would stop hating on "carbs" and redirect their disdain to sugars / small carbohydrates.

Fiber is carbohydrate also, but one that is not digestible by humans.