What is the primary function of soluble fiber in the diet?

Soluble fiber primarily functions to lower cholesterol levels in the diet. This type of fiber dissolves in water to form a gel-like substance in the digestive tract, which can bind to cholesterol and bile acids. By doing so, it helps reduce the amount of cholesterol that is absorbed into the bloodstream. This is particularly beneficial for heart health, as lowered cholesterol levels can reduce the risk of heart disease.

Additionally, soluble fiber can also help regulate blood sugar levels by slowing the absorption of sugar, which is important for individuals managing diabetes. However, its most well-known effect is its role in cholesterol reduction, making it a vital nutrient for maintaining cardiovascular health.

The other options do not align with the primary function of soluble fiber. While soluble fiber does provide some benefits related to energy regulation and metabolic processes, it does not directly increase blood sugar, provide energy like macronutrients, or promote muscle growth.