Ver sección 5.1.3 La crisis de metasentido

Although DFs have multiple beneficial effects on human body, excessive intake of DFs can cause discomfort and affect the absorption of fats, proteins, and essential elements. It should be mentioned that these effects vary with DF composition and individuals.

Some IDFs, such as guar gum, can be fermented by intestinal microorganisms to produce volatile fatty acids, carbon dioxide, and methane, which can cause abdominal distension. The filling effect of DFs reduces the adsorption of proteins, fatty acids, and carbohydrates and the increased viscosity of gastrointestinal fluids prevents the contact between these substrates

with digestive enzymes. Hence, DFs reduce their bioavailability. DFs can bind metal ions and can reduce their absorption.

Some DFs interfere with the absorption of vitamins. It is reported that konjac mannan reduces soluble vitamin absorption by removing bile acids, but does not reduce fat-insoluble vitamin absorption in the intestine [35].

No uniform standards have been formulated for the daily intake of DFs due to the complexity of DFs and individual differences. The daily intake recommended by FDA is 20~35g for adults and that in Japanese is 20 g or more. The Chinese Nutrition Association enacted the Chinese dietary intake references in 2000 and suggests that the daily dietary fiber intake of adults is 30.2 g.

R

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Editors: D.Wang, H. Lin, J. Kan et al. © 2012 Nova Science Publishers, Inc.

Chapter 4

L IPIDS