Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
A diet that contains considerable amounts of substances such as fiber or cellulose, which the human body is unable to metabolize and absorb. This diet is particularly useful in treating constipation and may be beneficial also in preventing certain diseases of the gastrointestinal tract. Lay people may refer to a high-residue diet as one containing a lot of roughage. See: fiber
See also: diet