GSTM1 and Iron deficiency anemia: A New Zealand study of women aged 18 to 40 years found that, in addition to low consumption of animal tissue foods (meat, poultry, and fish), the nondietary factors blood donation, nose bleeds, and menstruation were all associated with mild iron deficiency (SF < 20 μg/L; Hb ≥ 120 g/L) [7].