oth flaxseeds and psyllium provide a great source of fiber. For example, 1 tbsp. of whole flaxseeds contains 3.0 g fiber while 1 tbsp. of ground flaxseeds provides 2.2 g fiber. The single serving of 1 tbsp. psyllium husks contains 3.0 g fiber. Most of the fiber in psyllium and flaxseeds is soluble, a type of fiber that has the ability to absorb water and form a gel-like substance that is responsible for the cholesterol-lowering benefit. Soluble fiber can help prevent constipation and alleviate diarrhea. Moreover, this type of fiber can help regulate your blood sugar levels after a meal, which can improve diabetes control