Psyllium , or ispaghula , is the common name used for several members of the plant genus Plantago whose seeds are used commercially for the production of mucilage. Psyllium is mainly used as a dietary fiber to relieve symptoms of both constipation and mild diarrhea, and occasionally as a food thickener. Allergy to psyllium is common in workers frequently exposed to the substance. Use of psyllium in the diet for three weeks or longer often lowers blood cholesterol levels in people with elevated cholesterol, and can lower blood glucose levels in people with type 2 diabetes. Use of psyllium for a month or longer may produce a small reduction in systolic blood pressure.The plants from which the seeds are extracted tolerate dry and cool climates and are mainly cultivated in northern India. Uses
Dietary supplements containing psyllium are sold mainly to aid weight loss, although there is little scientific evidence for such effects. Food
Psyllium has been used as a thickener in ice cream and other frozen desserts. A 1.5% weight/volume ratio of psyllium mucilage exhibits binding properties that are superior to a 10% weight/volume ratio of starch mucilage. The viscosity of psyllium mucilage dispersions are relatively unaffected between temperatures of 20 and 50 °C (68 and 122 °F), by pH from 2 to 10, and by salt (sodium chloride) concentrations up to 0.15 M.

Human health
Constipation
Psyllium is mainly used as a viscous, soluble dietary fiber that is not absorbed by the small intestine.
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J. Christopher Perry, M.P.H., M.D., 2005 (Dependent Personality Disorder)
Diagnostic Features, Complications, Prevalence, Associated Laboratory Findings
MedlinePlus Medical Encyclopedia: Dependent personality disorder