Dietary Fiber in Public Health Nutrition: Chemical Traits and Mechanisms for Chronic Disease Prevention

Abstract

Dietary fiber is a key human nutritional component with multiple overall health benefits, especially for preventing chronic diseases like type 2 diabetes, cardiovascular diseases, obesity and colorectal cancer. Despite decades of research confirming its importance, many reviews fail to link its chemical properties to in vivo mechanisms and public health roles. This paper integrates these by summarizing its chemical composition, physical properties, classification and associating them with health-effect nutritional mechanisms. The results of this paper show that dietary fiber acts via multiple pathways. It regulates blood glucose and cholesterol, improves gut health, aids appetite control and reduces inflammation. Soluble fibers with high viscosity and fermentability, such as β-glucan and pectin, are most effective for better metabolic outcomes. However, global intake is far below the WHO’s 25-30g daily recommendation. This gap highlights the need for nutrition education, improved food labeling and fiber-fortified foods. Future research should optimize fiber classification beyond “soluble vs. insoluble” and explore personalized nutrition to enhance its chronic disease prevention effects.