“…The elevation of GGT could be expression of excess deposition of fat in liver (hepatic steatosis), and/or may reflect inflammation (Marchesini et al, 2001;Hotalamsligil, 2003;Malnick et al, 2003), both expressing the presence of oxidative stress and it plays a major role in pathological conditions such as inflammation, malignant diseases, aging, cardiovascular disease (Droge, 2002), and also in pathophysiology of diabetes (West, 2000;Haluzik and Nedvidkova, 2000;Rosen et al, 2001). A decrease in antioxidant capacity has been observed in the plasma of diabetic patients (Jones et al, 1988;Maxwell et al, 1997;Haluzik and Nedvidkova, 2000;Rosen et al, 2001), and evidence from numbers of experimental studies revealed that the formation of free radicals and presence of oxidative stress is a direct consequence of hyperglycemia (Diedrich et al, 1994;Graier et al, 1996;Ceriello et al 1999). So, we know that coffee contains many compounds, which may have potential to influence glucose metabolism process to prevent hyperglycemia and oxidative stress consequently.…”