Specifically, we assessed red cell indices (RDW, MCV, RBC count, and hemoglobin), markers of iron metabolism (soluble transferrin receptor /sTfR/ and reticulocyte hemoglobin equivalent /RET-He/), chronic diabetic complications, inflammation markers (high-sensitivity C-reactive protein /Hs-CRP/, homocysteine, and ferritin), and lifestyle factors (physical activity, smoking, and alcohol use). Here, TFRC is linked to diabetes mellitus.