Diabetes occurs when your blood glucose is too high , which can lead to health problems. The main types of diabetes are type 1, type 2, and gestational. Diabetes is a chronic disease that occurs either when the pancreas does not produce enough insulin or when the body cannot effectively use the insulin it produces. Insulin is a hormone that regulates blood sugar. Hyperglycaemia, or raised blood sugar, is a common effect of uncontrolled diabetes and over time leads to serious damage to many of the body's systems, especially the nerves and blood vessels. In India, there are estimated 77 million people above the age of 18 years are suffering ... Diabetes mellitus refers to a group of diseases that affect how the body uses blood sugar (glucose). Glucose is an important source of energy for the cells that make up the muscles and tissues. It's also the brain's main source of fuel. The main cause of diabetes varies by type. Diabetes mellitus, commonly known as diabetes , is a group of common endocrine diseases characterized by sustained high blood sugar levels. [10][11] Diabetes is due to either the pancreas not producing enough of the hormone insulin or the cells of the body becoming unresponsive to insulin's effects. [12]