Drinking tea and coffee is a serious health hazard for the diabetic patients. The most active alkaloid principle in both tea and coffee is caffeine. Caffeine is an addictive drug similar to cocaine in as much as it stimulates the central nervous system. While these effects are short lived, it has been observed that they lead to withdrawal symptoms of irritability, lethargy, headache and anxiety. The daily intake of tea and coffee causes indigestion and gas formation. diarrhoea and constipation. They also increase the blood sugar level, which may lead to diabetes or aggravate its symptoms where the disease is already present.