The world at large is full of colorful variations in nature. We always simply think that people can be divided into men and women, unbeknownst to us, in addition to the main two categories, medical science does have hermaphrodites. The diagnosis of diabetes is simple, monitor a blood sugar at any time and if it is significantly elevated, you can diagnose diabetes. In general, hospitals will often give you the label “type 2 diabetes”. Do you ask if there is type 1 diabetes or type 3 diabetes in addition to type 2 diabetes? Type 1 diabetes is caused by an absolute lack of insulin in the body. As we know, when the body is invaded by foreign bacteria or viruses, “guards and bullets” often appear inside the body to destroy the foreign enemies. These “guards and bullets” include lymphocytes in the blood, phagocytes and some antibodies against the virus. Antibodies are small fragments of proteins secreted by lymphocytes and other cells, which act as “bullets” against viruses synthesized by these cells to target foreign pathogens. However, even the most sophisticated instruments can fail at times, and these guns and ammunition, which are intended to deal with foreign viruses, occasionally go out of control and turn around and massacre the islet cells of the pancreas, leaving them completely destroyed and unable to synthesize and secrete insulin. The lack of insulin leads to elevated blood sugar. Long-term elevation of blood sugar can lead to aggravation of vascular lesions and eventually heart, brain and kidney complications. From the above explanation of the causes, we find that the treatment of type 1 diabetes is actually “very simple”, and according to the principle of “what is lacking is supplemented”, giving appropriate insulin supplementation is the only treatment plan. However, the prevention of type 1 diabetes is relatively difficult, and there is no uniform approach in the world. Type 2 diabetes is the result of a relative lack of insulin. An average normal-sized individual requires about 50 units (IU) of insulin per day. iu stands for “international unit”. When we gain weight or are in a disease state, the amount of insulin required increases significantly. For example, when we are slim (50-70 kg), we need about 40 IU of insulin per day, and our islet cells can easily perform their production tasks. When we are in an obese state (80-100 kg), the insulin requirement increases greatly, and we may need to consume 200 IU of insulin per day. Such a large insulin demand can wear out the islet cells. It works desperately overload all day and night to produce a large amount of insulin to meet the needs of the body to lower blood sugar. Short-term persistence is still tolerable, but long-term overload makes the islet cells fail and the ability to secrete insulin decreases (for example, only 60 IU of insulin per day), but still cannot fully meet the body’s needs, resulting in an increase in blood glucose levels. As we can see, type 2 diabetes is a slowly progressing process, a process in which the pancreatic islet cells are gradually dragged down. If we can take early measures to reduce weight and improve the body’s demand for insulin, we can delay or avoid the emergence of diabetes to a certain extent. The above describes the main causes of the formation of type 1 diabetes and type 2 diabetes. Depending on the cause of elevated blood glucose, gestational diabetes and diabetes secondary to other diseases can also occur. They will not be further described here. However, regardless of the cause of elevated blood glucose, we can achieve blood glucose control through insulin therapy.