The results of our research showed that both in the case of women and men, the average CAT activity is the highest at 2 a.m. In the results obtained by a group of other scientists who first conducted such studies in 2005 on clinically healthy volunteers and patients with cirrhosis of the liver aged 25–45 years, it can be noticed that the highest activity of CAT occurs at 6 a.m. [53]. Here, CAT is linked to Cirrhosis.