Total dietary fiber (TDF) is the sum of the dietary carbohydrates
that are resistant to digestion by mammalian
enzymes in the small intestine but can be partially or
completely fermented in the hindgut [1]. According to
its solubility, TDF can be divided into soluble dietary
fiber (SDF) and insoluble dietary fiber (IDF) [2]. Dietary
fiber is a key factor determining nutrient utilization in
the diet and more emphasis should be given to routine
techniques that identify the nutritional and physiological
“quality” of dietary fiber