Using a single-group time-series design, we determined that osmotic
diarrhea caused by
maltitol ingestion was suppressed by the addition of not only soluble but also insoluble
dietary fiber in healthy humans. We then clarified that
cellulose delayed gastric emptying in rats. Twenty-seven healthy volunteers ingested
maltitol step-wise at doses of 15, 20, 25, 30, 35, 40 and 45 g from small to large amounts. Within that range of ingested amounts, 22 out of 27 subjects experienced osmotic
diarrhea from
maltitol ingestion, and the minimal dose level of
maltitol that induced osmotic
diarrhea (MMD) was established for each subject. When 5 g of
cellulose was added to the MMD, osmotic
diarrhea was suppressed in 13 out of 19 subjects (68.4%), while partially hydrolyzed
alginate-Na (PHA-Na), a soluble
dietary fiber, suppressed osmotic
diarrhea in 10 out of 20 subjects (50.0%). When a mixed
solution of
cellulose and
maltitol was administered to rats, the gastric emptying of
maltitol was significantly delayed at 30 and 60 min after administration (p=0.019, p=0.013), respectively. PHA-Na also significantly delayed gastric emptying at 30 min (p=0.013). In conclusion,
cellulose can suppress the osmotic
diarrhea caused by
maltitol ingestion in humans and delay the gastric emptying of
maltitol in rats. A new physiological property of
cellulose was clarified in this study.