During a routine anemia workup in a 52-year-old man with hemoglobin 8.9 g/dL and MCV 68 fL, iron studies show serum iron 45 µg/dL, TIBC 420 µg/dL, ferritin 8 ng/mL, and transferrin saturation 11%. What is the most common cause of iron deficiency anemia in adult males in India?

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