Betelnut chewing: a contributing factor to the poor glycaemic control in diabetic patients attending Port Moresby General Hospital, Papua New Guinea.

This descriptive study was conducted in the Diabetes Clinic of the Port Moresby General Hospital for 6 months, from July to December 2002. The aim was to document the usage and effects of betelnut chewing in diabetic patients. 210 patients were randomly selected from the list of patients in the appointment book, using a random number table. Betelnut chewing caused hyperglycaemia and diabetes mellitus in animal models. It was significantly associated with high fasting capillary blood glucose and was an independent risk factor for type 2 diabetes mellitus. In this study, the majority of patients with diabetes were in the older age group (> or = 45 years) and many of them were overweight or obese. The majority of patients had lived in the city of Port Moresby for many years before their diagnosis. 74% of diabetic patients chewed betelnut before their diagnosis and had continued the habit while undergoing treatment for diabetes. The majority (80%) of patients had poor glycaemic control as indicated by the high mean of their most recent blood glucose, which was 13.0 mmol/l in male and 13.1 mmol/l in female patients; these levels were not much lower than those at diagnosis. The mean follow-up of patients in the clinic was 6.2 years. On the balance of evidence, betelnut is a contributing factor to the poor glycaemic control in diabetic patients attending Port Moresby General Hospital.