Myths vs facts: HDL and Blutzucker

HDL cholesterol and blood sugar are linked through insulin metabolism and insulin resistance. Fact: Low HDL is an established risk factor for type 2 diabetes – large cohort studies consistently show an inverse association. Myth: High HDL automatically protects against high blood sugar. Reality is more nuanced: HDL function (e.g., antioxidant, anti-inflammatory) may matter more than concentration. Very high HDL (>80 mg/dL) can even be associated with increased diabetes risk (U‑shaped relationship). Additionally, blood sugar itself affects HDL composition: poor glycemic control leads to glycated HDL with reduced protective capacity. Genetic factors (e.g., CETP variants) can raise HDL without lowering diabetes risk. For practice: HDL is a useful marker but not a standalone target. Lifestyle factors – exercise, diet, weight – improve both HDL and blood sugar. Evidence: strong human observational data, but causality not fully proven. Caveat: no RCT shows that raising HDL alone lowers blood sugar.