There are two types of diabetes mellitus:
Type 1 diabetes mellitus
Here diabetes mellitus is hereditary. It is known as insulin-dependent or childhood-onset diabetes, which is characterized by a lack of insulin production.
Type 2 diabetes mellitus
This is caused by lifestyle changes like regular consumption of unhealthy food plus sedentary life and increase in weight. It is also called non-insulin-dependent or adult-onset diabetes. Diabetes mellitus is caused by the body's ineffective use of insulin.
What is pre-diabetes?
Dr. Shalini Jaggi, Senior Consultant with Action Diabetic Centre explains the term pre-diabetes, "When one's sugar levels are higher than normal but not as high to be treated as diabetes that is known as pre-diabetes. People who have a fasting plasma blood glucose in the 100-125 mg/dl range are defined as having impaired fasting glucose and a post prandial blood sugar between 141-199 are defined as having impaired glucose tolerance. These together are defined as pre-diabetes."