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Unread 03-11-2008, 09:41 AM
lylemcd's Avatar
lylemcd lylemcd is offline
Join Date: Feb 2008
Posts: 22,641
Default Fiber and nutrient absorption

Ok, so this came up last week sometime and I knew I had numbers for it and I came across this in the folder of the never to be finished mondo opus book. I'm going to assume that I had some decent source (probably the Stipanuk book) for the numbers. Anyhow, there you go. Ultimately, it's a fairly small effect.

I should mention that very high fiber intakes can increase the amount of nutrients being lost to excretion. For example, higher fiber intakes may reduce fat absorption by about 3 percent, protein by maybe 5%. Itís been estimated that increasing fiber intake from 18 to 36 g/day would increase caloric losses by about 100 cal/day or so. Essentially, the fiber prevents the enzymes from being able to reach the nutrients, and they simply pass through unabsorbed. This is another reason that high-fiber intakes can be useful while dieting: decreased caloric absorption. Of course, no athlete or bodybuilder wants decreased protein absorption so its sort of a mixed blessing.
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