Leukopenia: A blood condition where the number of white cells (leukocytes) is decreased. White cells include neutrophils and lymphocytes, they are the infection fighting cells in the blood stream. Both can be decreased in eating disorders complicated by leukopenia - called neutropenia and lymphopenia respectively. This is generally as a result of malnutrition and subsequent bone marrow hypoplasia. In eating disorders people with leukopenia don't necessarily get infections more often however their ability to fight those infections may be affected leading to a delay in diagnosis.