Purpose of Review
Recently, there have been increasing calls for insulin to be used as the initial treatment of type 2 diabetes, and if not then, soon after its onset. The underlying reason given is that insulin will slow apoptosis of pancreatic β-cells which is increased in type 2 diabetes. This review will examine the clinical evidence supporting this recommendation.
Recent Findings
Several observational studies in which newly diagnosed type 2 diabetic patients are intensively treated for a short time with insulin which is then stopped have shown that approximately half of these patients retain good control without pharmacological therapy for up to a year. However, Hb A1c levels in patients who have to be started on oral anti-diabetic drugs (OAD) are similar to the values in those who do not. Hb A1c levels are similar in patients randomized to initial therapy with insulin or OAD. There is no clinical evidence yet for an effect of insulin on β-cell apoptosis.
Summary
The primary goal is to achieve and maintain Hb A1c levels of <7.0%. Given the extra demands on both patients and physicians when starting insulin compared to OAD and the many subsequent years in which patients have diabetes, the arguments for using insulin initially, or in patients who have achieved the target Hb A1c level, are not convincing. However, as soon as OAD therapy cannot meet this goal, insulin must be introduced.