What is the primary source of dietary fiber?

The primary source of dietary fiber is plant foods. Fiber is a type of carbohydrate that the body cannot digest, and it plays a crucial role in digestive health. Plant-based foods such as fruits, vegetables, legumes, whole grains, nuts, and seeds are rich in various types of dietary fiber, including soluble and insoluble fiber.

Soluble fiber, found in foods like oats and beans, helps to lower blood cholesterol and stabilize blood glucose levels. Insoluble fiber, which is abundant in whole grains and vegetables, aids in promoting regular bowel movements and preventing constipation. Including a variety of plant foods in the diet therefore not only provides essential vitamins and minerals but also ensures adequate fiber intake, which is vital for overall health.

In contrast, animal products and dairy items typically contain little to no fiber, while processed foods can often have some fiber added, but they are not considered a primary source as they may also be high in sugars and unhealthy fats. Thus, the most reliable and impactful source of dietary fiber comes from a diverse array of plant-based foods.