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Insulin resistance and excess weight in adolescent insulin-dependent diabetic girls.

Insulin dependent diabetic adolescent girls show a tendency towards excess weight. The relationship between insulin resistance and body mass index (BMI) was investigated in 23 Type 1 adolescents aged 13-20 yr. These patients body mass indexes spanned from 19.8 to 30.5. Excess weight was evaluated using Z-scores, corrected for age with reference to french standards. 9 patients with a Z-score greater than 2 were considered as obese. Insulin sensibility was measured using the hyperinsulinaemic euglycaemic clamp (insulin infusion rate, 1 mU kg-1 min-1). The mean glucose infusion rate during the clamp was low in the diabetic girls (2.29 +/- 1.35 mg kg-1 min-1), confirming the existence of insulin resistance. However, the degree of insulin resistance was not correlated with the excess in weight (glucose infusion rate, 2.23 +/- 1.24 vs 2.33 +/- 1.46 mg kg-1 min-1 in the obese and the non-obese patients, respectively). None of the factors which influence on insulin sensitivity could explain this lack of correlation, the obese patients showing greater daily insulin doses (1.36 +/- 0.22 vs 1.22 +/- 0.25 unit kg-1 day-1) and worse metabolic control (Hba1C, 10.9 +/- 1.4 vs 10.2 +/- 2.0%). Insulin resistance was significantly correlated with free fatty acid levels during the clamp.