We have found that a 6-month course of insulin therapy after a short-term intensive insulin therapy could shorten the period of hyperglycemia to preserve ß-cell function and further improve long-term glycemic control in recently diagnosed type 2 diabetes with severe hyperglycemia (>300 mg/dl, with HBA1C level around 9-11%) in our previous study. We thus hypothesized that a 6-month course of basal insulin therapy could also help to preserve ß-cell function in newly diagnosed type 2 diabetes with moderate hyperglycemia (200-300 mg/dl). This prospective study is outpatient-based to evaluate whether 6-month basal insulin therapy versus oral anti-diabetic treatment (Metformin and sitagliptin) soon after the diagnosis of type 2 diabetes with moderate hyperglycemia (200-300 mg/dl) is associated with better ß-cell function reservation. We skip a short-term intensive admission course of insulin therapy as our previous study in newly diagnosed type 2 diabetes with severe hyperglycemia.

ß-Cell dysfunction and decreased insulin sensitivity are the main pathophysiological defects responsible for the development of hyperglycemia. There is a progressive deterioration in ß-cell function and mass in type 2 diabetics. Optimal metabolic control, especially early intensive glycemic control, plays a role in the prevention of progressive ß-cell dysfunction and possibly destruction of the ß-cells with worsening of diabetes.

We have found that a 6-month course of insulin therapy after a short-term intensive insulin therapy could shorten the period of hyperglycemia to preserve ß-cell function and further improve long-term glycemic control in recently diagnosed type 2 diabetes with severe hyperglycemia (>300 mg/dl, with HBA1C level around 9-11%) in our previous study. We thus hypothesized that a 6-month course of basal insulin therapy could also help to preserve ß-cell function in newly diagnosed type 2 diabetes with moderate hyperglycemia (200-300 mg/dl). This prospective study is outpatient-based to evaluate whether 6-month basal insulin therapy versus oral anti-diabetic treatment (Metformin and sitagliptin) soon after the diagnosis of type 2 diabetes with moderate hyperglycemia (200-300 mg/dl) is associated with better ß-cell function reservation. We skip a short-term intensive admission course of insulin therapy as our previous study in newly diagnosed type 2 diabetes with severe hyperglycemia.

This study also can assess what readily available parameter would predict which patients will achieve long-term successful glycemic control after correction of glucose toxicity.

Our results will provide evidence that a 6-month course of basal insulin therapy could shorten the exposure to moderate hyperglycemia and further improve beta-cell function to achieve long-term glycemic control.

Inclusion Criteria:

1. Recently diagnosed type 2 diabetic patients.
2. Fasting plasma glucose between 200-300 mg/dl (A1C level between 7% and 10%).
3. Those who age between 30 and 80 years old and can inject insulin by themselves.

Exclusion Criteria:

1. Previous treated with anti-diabetic medication
2. Pregnant or nursing women.
3. Impaired liver function (ALT > 120 U/L)
4. Impaired renal function (Serum creatinine >1.5 mg/dL in male, >1.4 mg/dL in female )
5. Recently suffered from MI or CVA.
6. Patients are acute intercurrent illness.
7. 2-hour C-peptide level < 1.8 ng/mL.