What is the main role of soluble fiber in the diet?

The main role of soluble fiber in the diet is to absorb water and lower blood cholesterol. Soluble fiber dissolves in water, forming a gel-like substance that can help trap bile acids, leading to their excretion. Since bile acids are made from cholesterol, this process effectively reduces blood cholesterol levels. By binding with cholesterol in the intestines, soluble fiber decreases the amount of cholesterol absorbed into the bloodstream, thus playing a significant role in cardiovascular health.

In addition to its cholesterol-lowering effects, soluble fiber can moderate blood sugar levels by slowing the absorption of sugar, which can be beneficial for individuals with diabetes. This fiber is also associated with promoting gut health, as it serves as a food source for beneficial gut bacteria.

While soluble fiber does contribute to overall digestive health by enhancing the body's ability to process food, its primary distinction is the ability to absorb water and effectively reduce blood cholesterol levels.