Clinical Report: HDL-C Levels and Mortality from Top 10 Global Causes
Overview
This large UK Biobank study of over 429,000 adults reveals non-linear, sex-specific associations between HDL-C levels and mortality from the top 10 global causes of death. Both low and extremely high HDL-C levels increase death risk for several diseases, with optimal HDL-C ranges differing by sex.
Background
High-density lipoprotein cholesterol (HDL-C) has traditionally been considered cardioprotective due to its anti-atherosclerotic and anti-inflammatory properties. However, randomized trials raising HDL-C have not reduced cardiovascular events, and observational studies suggest a U-shaped relationship between HDL-C and all-cause mortality. The extent to which HDL-C levels relate to cause-specific mortality beyond cardiovascular disease remains unclear. Understanding these associations is critical for refining lipid management and assessing HDL-C’s clinical relevance.
Data Highlights
Cause of Death
HDL-C Pattern
Optimal HDL-C Range (mg/dL)
Sex Differences
Ischemic Heart Disease
U-shaped
Females: 58–74, Males: 50–60
Yes
Lower Respiratory Infections
U-shaped
Females: 58–74, Males: 50–60
Yes
Trachea, Bronchus, Lung Cancers
U-shaped
Females: 58–74, Males: 50–60
Yes
Diabetes Mellitus
U-shaped
Females: 58–74, Males: 50–60
Yes
Kidney Disease
U-shaped
Females: 58–74, Males: 50–60
Yes
Chronic Obstructive Pulmonary Disease (COPD)
J-shaped
30–50
Not specified
Liver Disease
J-shaped
30–50
Not specified
Stroke
Females: L-shaped, Males: U-shaped
Not specified
Yes
Alzheimer’s Disease/Dementias
Females: U-shaped, Males: L-shaped
Not specified
Yes
Key Findings
U-shaped associations between HDL-C and mortality were found for ischemic heart disease, lower respiratory infections, lung cancers, diabetes mellitus, and kidney disease, indicating increased risk at both low and high HDL-C levels.
Optimal HDL-C ranges for lowest mortality risk differ by sex: 58–74 mg/dL for females and 50–60 mg/dL for males for these causes.
J-shaped mortality risk curves were observed for COPD and liver disease, with lowest risk at HDL-C levels of 30–50 mg/dL.
Stroke and Alzheimer’s disease/dementias showed sex-specific patterns: stroke mortality risk was L-shaped in females and U-shaped in males, while Alzheimer’s/dementia risk showed the reverse pattern.
Extremely high HDL-C levels were associated with increased mortality risk across multiple causes, challenging the notion that higher HDL-C is always beneficial.
Findings emphasize that HDL-C functionality, rather than quantity alone, should be a focus in future research and clinical practice.
Clinical Implications
Clinicians should recognize that both low and very high HDL-C levels may confer increased mortality risk, with optimal HDL-C targets varying by sex and cause of death. These results caution against simplistic approaches to HDL-C elevation and highlight the need to assess HDL quality and function. Personalized lipid management strategies considering these non-linear and sex-specific associations may improve patient outcomes.
Conclusion
This study demonstrates complex, non-linear, and sex-specific relationships between HDL-C levels and mortality from the leading global causes of death. Both deficient and excessive HDL-C levels are linked to increased mortality risk, underscoring the importance of evaluating HDL functionality beyond mere concentration.
References
UK Biobank Study 2024 -- Link Between High-Density Lipoprotein Cholesterol Levels and the Ten Leading Causes of Mortality
