Evaluation of the effect of four fibers on laxation, gastrointestinal tolerance and serum markers in healthy humans.
BACKGROUND
Average dietary fiber intake in the United States is roughly half of the recommended amount. As new dietary fiber products are introduced to increase fiber intake, it is critical to evaluate the physiological effects of such fibers.


OBJECTIVE
This study examined the effect of 4 fibers derived from maize or tapioca on fecal chemistry, gastrointestinal (GI) symptoms and serum markers of chronic disease.


METHODS
Twenty healthy subjects completed the single-blind crossover study in which 12 g/day of fiber (pullulan, Promitor Resistant Starch, soluble fiber dextrin or Promitor Soluble Corn Fiber) or placebo (maltodextrin) were consumed for 14 days followed by a 21-day washout. GI symptom surveys were completed (days 3 and 14), stools were collected (days 11-14), diet was recorded (days 12-14) and fasting blood samples were obtained (day 15).


RESULTS
The 4 test fibers were well tolerated, with mild to moderate GI symptoms. Total short-chain fatty acid (SCFA) concentrations did not differ among the treatments. Fecal pH and individual SCFAs were affected by some treatments. Stool weight and serum markers of chronic disease did not change with these treatments.


CONCLUSIONS
Increasing fiber intake by 12 g/day was well tolerated and may have a positive impact on colon health due to fermentation.
Stewart
Maria L
ML
Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN, USA.
Nikhanj
Soma D
SD
Timm
Derek A
DA
Thomas
William
W
Slavin
Joanne L
JL
D000328:Adult; D015415:Biomarkers / Q000097:blood; D002097:C-Reactive Protein / Q000187:drug effects / Q000378:metabolism; D003085:Colic; D018592:Cross-Over Studies; D003672:Defecation / Q000187:drug effects*; D003912:Dextrins / Q000097:blood / Q000494:pharmacology; D004043:Dietary Fiber / Q000378:metabolism* / Q000494:pharmacology*; D005232:Fatty Acids, Volatile / Q000097:blood; D005243:Feces / Q000737:chemistry*; D005260:Female; D005414:Flatulence; D041981:Gastrointestinal Tract / Q000187:drug effects* / Q000378:metabolism*; D054439:Ghrelin / Q000097:blood; D005936:Glucans / Q000097:blood / Q000494:pharmacology; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D008055:Lipids / Q000097:blood; D008297:Male; D002365:Manihot; D011134:Polysaccharides / Q000097:blood / Q000494:pharmacology; D012016:Reference Values; D016037:Single-Blind Method; D003313:Zea mays / Q000378:metabolism
D015415:Biomarkers; D003912:Dextrins; D004043:Dietary Fiber; D005232:Fatty Acids, Volatile; D054439:Ghrelin; D005936:Glucans; D008055:Lipids; D011134:Polysaccharides; C008315:maltodextrin; C009109:pullulan; D002097:C-Reactive Protein