Myths vs facts: APOE and Sport

APOE (apolipoprotein E) is primarily known for its role in lipid metabolism and as a risk factor for Alzheimer's disease. In sports, several myths circulate: for example, that ε4 carriers have a higher injury risk or poorer recovery. In reality, there is some evidence linking ε4 to increased risk of chronic traumatic encephalopathy (CTE) after repeated head impacts (e.g., boxing, American football). However, the evidence is not conclusive and effect sizes are small. There is no proven direct effect on athletic performance (endurance, strength). ε2 carriers might theoretically have better fat utilization, but evidence is weak. Bottom line: APOE testing for athletes is not clinically relevant at this point. Genetics is only one small factor alongside training, nutrition, and recovery.