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Mild Insulin Resistance during Oral Glucose Tolerance Test (OGTT) in Women with Acne

The purpose of this study was to evaluate serum levels of basal insulin and glucose‐stimulated insulin, and to evaluate their correlations with androgen levels in women with acne. Serum levels of total testosterone (T), free testosterone (FT), dihydrotestosterone (DHT), dehydroepiandrosterone sulfate (DHEA‐S), sex hormone binding globulin (SHBG), insulin‐like growth factor‐1 (IGF‐1), and immunoreactive insulin (IRI) were measured and compared in thirty women with moderate or severe acne and thirteen healthy controls. Serum FT, DHT and DHEA‐S levels in the acne group were significantly higher than those in the control group. In the acne group, there were no significant correlations between insulin or IGF‐1 levels and T, FT, DHT and SHBG, despite the positive correlation between insulin and IGF‐1. In order to determine the effects of insulin secretion as a dynamic response to an oral glucose tolerance test (OGTT) on serum androgen levels in acne patients, we examined the responses of serum insulin and androgen levels to a 75 g, 2 hour OGTT in the acne group and in the control group. Basal insulin levels were not significantly higher than those in the control group, but the summed insulin levels during the OGTT in the acne group were significantly higher than those in the control group. Serum T and FT levels in the acne group decreased during the OGTT, but these changes were not so significant when compared to normal controls. In conclusion, we tried to demonstrate mild insulin resistance during the OGTT in acne patients. However, postmeal transient hyperinsulinemia does not seem to play an important role in determining hyperandrogenemia in acne patients.