Psyllium is a fiber supplement, used primarily for the treatment of constipation due to its being a good source of soluble fiber. As a supplement, psyllium is derived from the seed husks of a plant called Plantago ovata.
Social theory is interdisciplinary and draws upon ideas from fields as diverse as anthropology and media studies. Social theory of an informal nature, or authorship based outside of academic social and political science, may be referred to instead as  social criticism  or  social commentary .
Role theory is a perspective in sociology and in social psychology that considers most of everyday activity to be the acting out of socially defined categories (e.g., mother, manager, teacher). Each social role is a set of rights, duties, expectations, norms and behaviours that a person has to face and fulfill. The model is based on the observation that people behave in a predictable way, and that an individualâs behavior is context specific, based on social position and other factors.