Which food group is the best source of insoluble fiber?

The best source of insoluble fiber among the food groups listed is whole grains. Insoluble fiber is important for digestive health as it adds bulk to the stool and helps to prevent constipation by promoting regular bowel movements. Whole grains, such as brown rice, whole wheat bread, oats, and quinoa, contain significant amounts of insoluble fiber.

In contrast, fruits primarily provide soluble fiber, which can help manage cholesterol levels and blood sugar. Legumes do contain fiber, but they are also rich in soluble fiber along with some insoluble fiber. Dairy products typically do not contain fiber, as they are animal-based foods that lack plant fiber content. Therefore, whole grains stand out as the optimal choice for a rich source of insoluble fiber.