Biopsy material obtained from the first portion of the jejunum of 56 unselected diabetics and 21 normal controls was examined under the electron microscope (in 8 cases) or with a method of stereologic morphometry. Controls were found to have a villous volume (VVi) of 50.19 +/- 10.1%. All values below 40% were interpreted as an expression of deterioration of the mucous membrane. Altogether 12.5% of the diabetics showed total atrophy, and 20% had significant reduction of VVi. These changes did not correlate with intestinal disorders or other signs of diabetes. In total atrophy histochemical changes could be demonstrated. Microangiopathy was not observed in the intestinal mucosa.
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