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Figure 1. Daily excretion of plant (P), bacterial (B) and soluble (S) fractions of stool by men fed constant diets of different fiber contents. Data are mean from five men, expressed on basis of stool dry weight. The pooled SEM of all fractions is 0.71. Each fiber addition increased daily stool plant (p < 0.0001) and soluble (p < 0.02) fractions. Daily output of bacterial mass during the medium fiber phase was greater (p < 0.02) than during the low fiber phase. Significant differences were indentified by two-way analysis of variance.
