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Role of bran in normals. Serum levels of cholesterols, triglyceride, calcium and total 3 alpha-hydroxycholanic acid, and intestinal transit time.

After the intake of approximately 24 g wheat bran daily for 5 weeks, 25 trainee nurses showed no changes in the serum levels of cholesterol, triglyceride, calcium or total 3 alpha-hydroxycholanic acid. On the other hand, the study revealed a reduced intestinal transit time with good correlation to an increased frequency of bowel movements. Average body weight fell significantly, by 0.4 kg. The daily caloric intake remained constant throughout the study period, whereas the calcium intake was significantly increased. Among the serum parameters and the dietary constituents, good correlation was found only between serum cholesterol and the dietary cholesterol content. In addition, an inverse relationship was demonstrated between the serum levels of cholesterol and total 3 alpha-hydroxycholanic acid. The significance of this observation is as yet unknown.