This invention teaches unique water dispersible dietary compositions of natural or chemically modified fiber materials that have a surface coating with surface active agents (or surfactants) with HLB number between 4 and 9, preferably between 4 and 7. The dietary product contain at least 10% of fiber materials of essentially polysaccharides derived from sources selected from psyllium, celluloses, methylcelluloses, hydroxyethyl celluloses, hydroxypropyl celluloses, gum guar, vegetables, fruits, or other natural or chemically modified materials. Surprisingly, these fiber containing materials coated with the said surfactants have significant improvement on water dispersibility. The type of surfactants disclosed usually present no harm to human body and can be easily applied to the said fibrous materials in bulk without any solvent.