Which of the following describes soluble fiber?

Soluble fiber is characterized by its ability to dissolve in water, forming a gel-like substance in the digestive tract. This type of fiber includes compounds such as pectins and gums, which are commonly found in various fruits, vegetables, legumes, and oats.

The presence of pectins and gums contributes to the health benefits associated with soluble fiber, including the ability to help regulate blood sugar levels and lower cholesterol. These soluble fibers can be beneficial in promoting digestive health and may help in weight management by increasing feelings of fullness.

In contrast, the other options describe characteristics that do not align with the definition of soluble fiber. Bread and bran cereals are primarily sources of insoluble fiber, which does not dissolve in water. Protein content is not a defining characteristic of fiber types, and identifying fiber as something that does not dissolve in water pertains specifically to insoluble fiber rather than soluble fiber.