The article identifies shared and specific blood biomarkers for multimorbidity. Growth differentiation factor 15, hemoglobin A1c, cystatin C, leptin and insulin levels were consistently and positively associated with rates of multimorbidity. These associations hold for both cross-sectional and longitudinal measurements. The study focuses on individuals aged 60 and over. The research was published in Nature Medicine on January 2, 2026 with doi:10.1038/s41591-025-04038-2. Biomarkers are used to evaluate several chronic diseases at the same time.