GSTM1 and anemia: Some studies have similarly observed increases in the Hb concentration (13.7 to 15.4 g/dL) and a decrease in the number of cases of participants with anemia (>12 g/dL) after nutritional intervention practices with foods rich in antioxidants (polyphenols), proteins, carbohydrates, and vitamins (C, B12) through dairy products, cereals, vegetables, and fruits [25,53].