Iron deficiency non-anemia has been commonly defined in athletic populations as a serum ferritin of <20 μg·L−1 and transferrin <16% [20,29]; however, variations in the literature range from serum ferritin values of <12 μg·L−1 through to <40 μg·L−1 [29,30,31]. This evidence concerns the gene TF and nutritional disorder.