Is HDL useful for Darmgesundheit?

HDL (high-density lipoprotein) is best known for its cardiovascular benefits, such as reverse cholesterol transport. Its direct relevance to gut health is not well established. Some mechanistic studies suggest HDL may exert anti-inflammatory effects and modulate the gut microbiota, for instance by binding lipopolysaccharides. However, these findings come mostly from cell culture or animal models; robust human trials are lacking. Direct-to-consumer genetic tests (e.g., MyBody-X) that include HDL-related SNPs (e.g., in CETP, LIPC) cannot provide meaningful insights into gut health. Blood HDL levels are strongly influenced by diet, exercise, and lifestyle. For improving gut health, evidence supports a high-fiber diet, adequate hydration, and regular physical activity—not targeting HDL. Raising HDL through drugs or supplements has no proven benefit for the gut. In summary, HDL is not a useful marker for gut health; the evidence is mechanistic and insufficient for clinical recommendations.