Guest guest Posted April 13, 2005 Report Share Posted April 13, 2005 I didn't read your links so excuse me if this was covered, but fiber also can tie up fats and prevent them from being absorbed which could have negative caloric value. It's not simple as these things can vary with amount and when present. I have more questions than answers, but am not losing sleep over this as I find micromanagement too difficult to pursue. JR -----Original Message----- From: [mailto:wmbragg@...] Sent: Wednesday, April 13, 2005 11:48 AM Subject: [ ] Fiber, energy and CR Does anybody takes in mind fiber calories when counting them for CR purposes? Although there is ongoing debate in this area, a caloric value of 1.5- 2 cal/gram for fiber is the currently accepted value (being the soluble kind the more caloric) which are absorbed from gut (mainly colon) once bacteria living there have metabolized it into SCFA, such as acetate (used for building fats), propionate (used for gluconeogenic purposes) and butyrate (main food for colonocites).. Even then, since a fiber intake for most people these days probably doesn't top 25 grams/day, that's only about 35-50 calories total per day. A massive 100 grams of fiber/day (I easily reach values of 60-70 grams a day) would yield >150 kcalories, what would be significan; thus you may be adding about 10% more calories from those calculated just from fats, proteins or carbs. This turns fiber to a fourth macronutrient by its own, isn't it?! See: http://tinyurl.com/64o8l http://tinyurl.com/6ms9u http://tinyurl.com/3vwzb http://tinyurl.com/56q2o http://tinyurl.com/65sss Willie. Quote Link to comment Share on other sites More sharing options...
Guest guest Posted April 13, 2005 Report Share Posted April 13, 2005 Willie, Most calorie consumption calculations subtract the grams of fiber from the total grams of carbohydrate and then multiply times four to get the " actual " calories from carbohydrate. However, you are correct that the by-products of fiber metabolized by bacteria have caloric content. The question is how much of that is absorbed by the body and how much is used by the microflora. The satiety produced by soluble fiber like guar or konjac (glucomannan) is probably due not only to the bulk, but also to the absorption of the by-products produced by colonic microflora. Microflora produce not only short-chain fatty acids, but also vitamins. http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=mmed.section.5106 " The intestinal microflora synthesizes vitamin K, which is a necessary cofactor in the production of prothrombin and other blood clotting factors. Intestinal bacteria also synthesize biotin, vitamin B12, folic acid, and thiamine. " Tony === From: " " <wmbragg@...> Date: Wed Apr 13, 2005 12:48 pm Subject: Fiber, energy and CR Does anybody takes in mind fiber calories when counting them for CR purposes? Although there is ongoing debate in this area, a caloric value of 1.5-2 cal/gram for fiber is the currently accepted value (being the soluble kind the more caloric) which are absorbed from gut (mainly colon) once bacteria living there have metabolized it into SCFA, such as acetate (used for building fats), propionate (used for gluconeogenic purposes) and butyrate (main food for colonocites).. Even then, since a fiber intake for most people these days probably doesn't top 25 grams/day, that's only about 35-50 calories total per day. A massive 100 grams of fiber/day (I easily reach values of 60-70 grams a day) would yield >150 kcalories, what would be significan; thus you may be adding about 10% more calories from those calculated just from fats, proteins or carbs. This turns fiber to a fourth macronutrient by its own, isn't it?! See: http://tinyurl.com/64o8l http://tinyurl.com/6ms9u http://tinyurl.com/3vwzb http://tinyurl.com/56q2o http://tinyurl.com/65sss Willie. Quote Link to comment Share on other sites More sharing options...
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