References were not found on the effect of adding dietetic fibers to pimento purée to modify its viscosity and texture. The tomato dietary fiber was chosen because it is an ingredient found along with the pepper in culinary preparations, also wheat fiber was chosen because of both are fully compatible with pimento puree and do not add flavour. Earlier works published on fiber suspensions indicate that the rheological behaviour of these materials nor only depends on fiber characteristics, but also on fiber orientation and matrix characteristics. The viscosity of fiber suspensions increase at low shear rates as concentration of fibers and/or the aspect ratio increase (Kamal and Mutel, 1989 and Laun, 1984). At high shear rates, the viscosity of fiber suspensions approach the viscosity of the matrix, and became almost independent of fiber concentration and fiber characteristics (Czarnecki and White, 1980 and Laun, 1984). Based on these antecedents, the behaviour of dietetic fibers in aqueous suspensions and as thickenings should be experimentally determined.