About the advantages of coffee. A study by the USA Department of Agriculture and Food Chemistry. The study and found that those who drink coffee regularly have the opportunity to escape from Type 2 diabetes by 50% because coffee contains caffeine, which has the ability to inhibit hIAPP and poly peptide. That is causing the abnormal protein. The cause of diabetes type 2 . Then, Coffee can reduce stress and depression. It makes people drink feel satisfied and happy because the coffee contains caffeine.