Psyllium is a central ingredient in many high-fiber grains, and often combined with wheat and oats. As soluble fiber, psyllium provides food for friendly bacteria in the gut, as GI Care. When psyllium was combined with 90 percent of wheat insoluble fiber, the bacteria that improve psyllium and improved purification effect wheat fiber effect is obtained. Psyllium fiber expands in the stomach to help you feel full, and because it takes a while to digest, stabilizes blood sugar and helps you feel full longer.