Which diet is known for containing large amounts of fiber or indigestible food?

A high-fiber diet is specifically designed to include significant amounts of dietary fiber, which is found in plant-based foods. Fiber is crucial for digestive health as it helps regulate the body's use of sugars, assisting in maintaining hunger and blood sugar levels. This type of diet typically involves high consumption of fruits, vegetables, whole grains, legumes, nuts, and seeds, all of which are rich in fiber.

Fiber is not easily digested by the human body, which means it passes largely intact through the digestive system. This characteristic allows it to provide bulk to the stool and aids in preventing constipation, promoting regular bowel movements, and fostering a healthy gut. It has also been linked to a lower risk of various diseases and can aid in weight management, making it very beneficial for overall health.

The other options, such as high-calcium, low-carb, or high-fat diets, do not prioritize fiber intake and thus do not match the specific characteristics of a high-fiber diet.