What role does fiber play in a healthy diet?

Fiber plays a crucial role in a healthy diet primarily due to its benefits for digestion and cholesterol management. It acts as a bulking agent in the digestive system, helping to promote regular bowel movements and prevent constipation. By adding bulk to stool, fiber facilitates its passage through the intestines and helps maintain a healthy gut.

Additionally, fiber can aid in lowering cholesterol levels, particularly the low-density lipoprotein (LDL) cholesterol, often referred to as "bad" cholesterol. Soluble fiber, found in foods such as oats, beans, lentils, fruits, and vegetables, binds to cholesterol in the digestive system and can help reduce its absorption into the bloodstream. This leads to improved heart health and a reduced risk of cardiovascular disease.

Unlike being primarily a source of calories or a non-essential part of the diet, fiber provides significant health benefits. It is neither a primary energy source nor unnecessary; rather, it is integral to maintaining overall health, digestive function, and cholesterol levels.