Nowadays, Diabetes (Diabetes Mellitus) has become a problem for many people, 
but the causes are not clearly known. The following give the commonest causes of 
Diabetes, and we hope it may be helpful to you.
Types of Diabetes
Type 1 Diabetes belongs to an autoimmune disease owing to the destruction of 
the insulin-producing (islet) cells in the pancreas due to abnormal immune 
system. This disorder can also be triggered by genetic factor, malnutrition, and 
environmental factors, etc.
Type 2 Diabetes, as the more common form of diabetes, may present when the 
body either doesn’t produce enough insulin, or the insulin it produces doesn’t 
work as well as it should (insulin resistance). This form is more prone to 
people that are elderly, obese, have a family history of diabetes, or have 
gestational diabetes.
Diet
Diet is one of the most important causes of Diabetes, especially Type 2 
Diabetes, because any diet that contains sugars or carbohydrates may directly 
lead to increased blood sugar level. Foods that may develop and aggravate Type 2 
Diabetes include honey, soft drinks, milk and milk products, oily foods, 
alcoholic beverages, etc.
Environmental factors
Diabetes may result from external factors including: 1) taking steroids or 
other medications that lead to imbalance of hormone within the body; 2) 
chemicals in certain vegetables like beans; 3) infections to the pancreas caused 
by some microbes.
Sedentary lifestyle
People with a sedentary lifestyle are more easily affected by Type 2 
Diabetes, because the unexercised muscles and tissues can influence the overall 
action of insulin and decrease its ability to utilize glucose. It can also be 
caused by stress in cases of injury, surgery, infections, pregnancy, and mental 
tensions, and so forth.
Hereditary factors
People who have hereditary leukocyte antigen in the blood have a higher 
chance to get Type 1 Diabetes. Type 2 Diabetes is also genetic but it is more 
prone to those who have high blood pressure and obesity.
Besides, obesity is a major cause of Diabetes Type 2. As people grows older, 
their risk of developing Diabetes increases due to less active and gain 
weight.