What is the primary source of dietary fiber?

The primary source of dietary fiber comes from plant-based foods, which include fruits, vegetables, whole grains, legumes, nuts, and seeds. These foods are rich in various kinds of fiber, such as soluble and insoluble fiber, both of which are beneficial for digestive health and overall well-being. Soluble fiber helps to lower cholesterol and control blood sugar levels, while insoluble fiber aids in regular bowel movements and prevents constipation.

In contrast, animal products do not contain dietary fiber, as fiber is a type of carbohydrate only found in plant foods. Processed foods often have reduced fiber content due to refining processes, such as milling grains into white flour, which removes the bran and germ where fiber is concentrated. Mineral supplements do not provide fiber, as they are purely composed of minerals without any carbohydrate content. Thus, plant-based foods are essential for ensuring adequate fiber intake in the diet.