Blood glucose can progress from normal to hyperglycemia in six months. type 1 diabetes mellitus has a rapid onset and may progress from normal fasting and postprandial blood glucose to hyperglycemia in a short period of time. type 2 diabetes mellitus, although usually slow in onset, has the potential to increase blood glucose very quickly if combined with partial insulin cell dysfunction. The main cause of type 1 diabetes is impaired islet cell function, with an absolute deficiency in insulin secretion. This type of diabetes is usually seen in young people, is polygenic, and tends to develop rapidly, with the ability to progress from normal fasting blood glucose to hyperglycemia in a short period of time. Type 2 diabetes usually has a slow onset, but in combination with partial pancreatic islet cell dysfunction, an increase in blood glucose can also occur in a very short period of time. In summary, in some cases, blood glucose can progress from normal to hyperglycemia over a six-month period, so it is recommended that patients be screened and follow the advice of their specialists.