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What causes low WBC in the elderly?

According to a study published by the National Institutes of Health, malnutrition caused by deficiencies in certain vitamins and minerals like vitamin B12, folate, and copper can cause low white blood cell (WBC) counts, or leukopenia. A decline in immune function and bone marrow health is a natural part of aging, but several other factors contribute to what causes low WBC in the elderly.