Anemia decreased the dopamine in animals fed fermented goat or cow milk with Fe overload (p < 0.05 and p < 0.001 respectively), MAO-A and MAO-B in the animals fed fermented cow milk (p < 0.001 for normal Fe and p < 0.05 for Fe overload), and goat milk with Fe overload (p < 0.001 MAO-A and p < 0.05 MAO-B). The gene discussed is MAOA; the disease is anemia.