What to watch with HDL and fertility?

HDL (high-density lipoprotein) is primarily known for cardiovascular protection, but it also plays a role in fertility. In women, low HDL levels can impair ovarian steroidogenesis and are associated with a higher risk of infertility. In men, HDL contributes to sperm membrane integrity; very low levels may reduce sperm quality. The PPARA gene variant rs4253778 is linked to HDL levels, but its clinical relevance for fertility is weak. Evidence comes from GWAS and observational studies, not from interventional trials. A low HDL level (<40 mg/dL or 1.0 mmol/L) is a general health risk marker, but using a DNA test alone to guide fertility optimization is not evidence-based. Focus on lifestyle factors that reliably raise HDL: regular exercise, a Mediterranean diet, and smoking cessation. For specific fertility concerns, medical evaluation (hormone panel, semen analysis) is more appropriate than genetic testing.