Montoya Carlos A, Henare Sharon J, Rutherfurd Shane M, Moughan Paul J
C.A. Montoya, S.J. Henare, and S.M. Rutherfurd are with the Massey Institute of Food Science and Technology, Massey University, Palmerston North, New Zealand.C.A. Montoya, S.J. Henare, S.M. Rutherfurd, and P.J. Moughan are with the Riddet Institute, Massey University, Palmerston North, New Zealand.
Nutr Rev. 2016 Aug;74(8):517-33. doi: 10.1093/nutrit/nuw014. Epub 2016 Jun 20.
The aim of this review is to identify the origin and implications of a nondietary material present in digesta and feces that interferes with the determination of dietary fiber in gastrointestinal contents. Negative values for ileal and fecal digestibility of dietary fiber are commonly reported in the literature for monogastric animal species, including humans. As negative values are not possible physiologically, this suggests the existence of a nondietary material in the gastrointestinal contents and feces that interferes with the accurate determination of dietary fiber digestibility when conventional methods of fiber determination are applied. To date, little attention has been given to this nondietary interfering material, which appears to be influenced by the type and concentration of fiber in the diet. Interestingly, estimates of dietary fiber digestibility increase substantially when corrected for the nondietary interfering material, which suggests that currently reported values underestimate the digestibility of dietary fiber and may misrepresent where, in the digestive tract, fermentation of fiber occurs. A new perspective of dietary fiber digestion in the gastrointestinal tract is developing, leading to a better understanding of the contribution of dietary fiber to health.
本综述的目的是确定存在于消化物和粪便中的一种非膳食物质的来源及其影响，该物质会干扰胃肠道内容物中膳食纤维的测定。文献中通常报道，包括人类在内的单胃动物物种的膳食纤维回肠消化率和粪便消化率为负值。由于生理上不可能出现负值，这表明胃肠道内容物和粪便中存在一种非膳食物质，当应用传统的纤维测定方法时，该物质会干扰膳食纤维消化率的准确测定。迄今为止，这种非膳食干扰物质很少受到关注，它似乎受饮食中纤维类型和浓度的影响。有趣的是，在对非膳食干扰物质进行校正后，膳食纤维消化率的估计值大幅增加，这表明目前报告的值低估了膳食纤维的消化率，可能会错误地描述纤维在消化道中的发酵位置。胃肠道中膳食纤维消化的新观点正在形成，这有助于更好地理解膳食纤维对健康的作用。
