Is HDL useful for blood sugar?

HDL (high-density lipoprotein) is primarily linked to cardiovascular health, not directly to blood sugar regulation. Observational studies suggest that higher HDL levels are associated with better insulin sensitivity and a lower risk of type 2 diabetes. The proposed mechanism involves HDL's anti-inflammatory and antioxidant properties, which may improve insulin action. However, the evidence is not strong enough to establish HDL as a direct regulator of blood glucose. Randomized controlled trials are lacking, and Mendelian randomization studies often fail to show a causal effect. HDL levels are heavily influenced by lifestyle factors such as exercise, diet, and alcohol intake. For blood sugar management, established markers like fasting glucose, HbA1c, and HOMA-IR are more reliable. A single HDL measurement is insufficient for assessing glucose metabolism. Caveat: HDL is a risk marker, not a therapeutic target. Pharmacological elevation (e.g., with niacin) does not improve glycemic control and may even worsen it.