Soluble fiber from foods such as psyllium seed husks, as part of a diet low in saturated fat cholesterol may reduce the risk of heart disease. A serving of whole psyllium husks supplies 6grams of the 7grams soluble fiber necessary per day to have this effect. Dietary fiber helps your body detoxify by adhering to toxins secreted into the digestive tract so they can be more easily eliminated. The main role of fiber 8n the diet is to feed the bacteria in the gut, which keep the cells healthy through numerous mechanism, including the production of butyrate, which fuels the cells of the intestinal lining.