CAT and nutritional deficiency disease: These results are in agreement with the results of another study, which states that nutritional deficiencies can affect the defense system of several scavenger enzymes, such as SOD, glutathione peroxidase, and catalase, in the form of a decreased activity in overcoming oxidative stress.39 Similar results were also found, which stated that antioxidant levels can be significantly decreased (p<0.05) under certain conditions, such as malnutrition.40