The health benefit of fiber in diets is primarily connected to:

The health benefit of fiber in diets is primarily connected to heart health due to its ability to help lower cholesterol levels and improve overall cardiovascular function. Soluble fiber, in particular, binds to cholesterol in the digestive system, which facilitates its removal from the body before it can enter the bloodstream. This process can lead to a reduction in LDL (low-density lipoprotein) cholesterol, often referred to as "bad" cholesterol, thereby decreasing the risk of heart disease and other cardiovascular issues.

Additionally, a high-fiber diet can promote healthier blood pressure and improve blood sugar levels, which are also crucial factors for maintaining heart health. Furthermore, fiber is beneficial in promoting satiety, helping regulate weight, which can indirectly support heart health as well.

While other options mention weight gain, cognitive function, and vitamin absorption, these are not the primary health benefits associated with fiber intake. For instance, fiber may aid digestion and mitigate weight gain by promoting fullness, but its most significant impact is observed in supporting cardiovascular health.