Abstract
Intensive insulin therapy is frequently complicated by excessive weight gain. The purpose of this study was to determine the cause and composition of this weight gain. Therefore, changes in body composition, energy expenditure, glycosuria, and substrate kinetics were evaluated in patients with IDDM who transferred from conventional insulin therapy to intensive insulin therapy. Six adult patients with IDDM were studied on conventional insulin therapy and after 2 mo of intensive insulin therapy while maintaining constant caloric intake and were compared with a group of 6 matched nondiabetic volunteers. Body composition was determined by underwater weighing. Energy expenditure was measured during 24-h stays in a whole-room calorimeter. Whole-body turnover rates of glucose, glycerol, palmitate, and leucine were determined by isotope dilution methods. Intensive insulin therapy lowered the mean daily blood glucose concentration and HbA1 (14.8 ± 1.6 to 7.7 ± 0.6 mM and 12.9 ± 0.9 to 9.6 ± 0.6%, both P P P P P
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