NEFL and sarcopenia: The analysis of the association between AD biomarkers and earlier sarcopenia progression revealed that only p‐tau181 (OR 1.24 [1.09; 1.42], p = 0.002) and NfL (OR 1.56 [1.30; 1.91], p < 0.001) were independently associated with the worse sarcopenia trajectory, also after adjustment for baseline age, sex, education, smoking and alcohol consumption, chronic diseases and physical activity (Table 3).