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Weight Loss Forum / Low Carb / November 2005Calorie balance: eaten vs excreted
I'm sure there must be plenty of info on this, this is an interesting question that's pretty fundamental. My question is "What percentage of ingested calories are excreted?" Say you are on 2000 calories per day, how many calories would the average sedentary person excrete (urine/faeces)? 50% (1000 calories)? 30%? 80%? I presume the remaining calories would be burned by the body. gtoomey There is little to no credible info on anything having to do with calories. It is a mirage. TC > I'm sure there must be plenty of info on this, this is an interesting > question that's pretty fundamental. [quoted text clipped - 5 lines] > > gtoomey > I'm sure there must be plenty of info on this, this is an interesting > question that's pretty fundamental. [quoted text clipped - 5 lines] > > gtoomey It depends on the calories. Excess carbohydrates are stored as fat as we all know. Fiber, however, is not. Excess protein is excreted in urine. How much that's excreted depends upon your metabolic needs. >>I'm sure there must be plenty of info on this, this is an interesting >>question that's pretty fundamental. [quoted text clipped - 9 lines] > know. Fiber, however, is not. Excess protein is excreted in urine. How much > that's excreted depends upon your metabolic needs. Protein is the only macronutrient furnishing the body useful nitrogen in significant proportions (proteins are complexes of amino acids). Excess protein is converted into fat (with little or no nitrogen) and the nitrogen (actually the whole amino group of the amino acids that make up protein) is excreeted in the urine. It is easy to see how that is sometimes stated as "Excess protein is excreeted in the urine". The Mayo Clinic Kidney guy says this: ------------------------------------------ http://www.mayoclinic.com/health/high-protein-diets/AN00847 Your body can store only small amounts of excess protein. During digestion and metabolism, protein is broken down into amino acids. These are the building blocks of protein. Next, nitrogen is removed from these extra amino acids. The nitrogen is processed by your liver and then excreted in urine as waste. --------------------------------------------  Signature1) Eat Till SATISFIED, Not STUFFED... Atkins repeated 9 times in the book 2) Exercise: It's Non-Negotiable..... Chapter 22 title, Atkins book 3) Don't Diet Without Supplimental Nutrients... Chapter 23 title, Atkins book 4) A sensible eating plan, and follow it. (Atkins, Self Made or Other) I think what he means is how much does your body absorb. I don't have the facts but I am also wondering that because it is known that the body doesn't absorb every little nutrient that we eat. > I think what he means is how much does your body absorb. I don't have > the facts but I am also wondering that because it is known that the > body doesn't absorb every little nutrient that we eat. The original poster obviously was concerned with the efficiency of digestion.... what percentage of macronutrient taken in by mouth exits the anus incompletely extracted from the imput food form. I am concerned with that too, as it is one of the means that allow variations between people on their tendency to gain weight. If, I convert 80% of my macronutrient input into useful body chemistry, someone who converts 40% of their macronutrient input can eat a lot more than me, do little exercise, and not gain weight..... while I may struggle with easy weight gain problems. Naturally, this has a lot to do with the whole problem of diet to maintain or lose weight. Joe the Aroma simply made a misstatement of how protein is digested. Signature1) Eat Till SATISFIED, Not STUFFED... Atkins repeated 9 times in the book 2) Exercise: It's Non-Negotiable..... Chapter 22 title, Atkins book 3) Don't Diet Without Supplimental Nutrients... Chapter 23 title, Atkins book 4) A sensible eating plan, and follow it. (Atkins, Self Made or Other) Excess protein is stored as fat. SignatureMost people are dumb as bricks; some people are dumber than that. -- MFW >> I'm sure there must be plenty of info on this, this is an interesting >> question that's pretty fundamental. [quoted text clipped - 9 lines] > all know. Fiber, however, is not. Excess protein is excreted in urine. How > much that's excreted depends upon your metabolic needs. I have read that humans are quite efficient at extracting calories from food. While checking feces for calories makes sense in a laboratory study, it is not necessary for dieting. Fiday, which seems to be the dominant way to measure consumed calories on AFDC is not likely to be quite right. However, it provides a good ballpark number and most importantly a benchmark. If Fitday says you are consuming 1800 calories per day over a 2 month period and you neither gain nor lose any weight for that 2 months, Then you know the Fitday benchmark for break even. To lose weight, in that example, you need to "eat less" until Fitday shows a lower average of calories per day. The difference in calories will match up to 3500 calories per pound. Fitday is accurate on this difference vs. weightloss in my experience. http://www.fitday.com I have no connection to Fitday, except as a download version customer. Cubit > I'm sure there must be plenty of info on this, this is an interesting > question that's pretty fundamental. [quoted text clipped - 5 lines] > > gtoomey Am I the only one that is amazed how a well formulated and interesting question can turn into all kinds of responses that do nothing to address the issue at hand? "My question is "What percentage of ingested calories are excreted?" >Am I the only one that is amazed how a well formulated and interesting >question can turn into all kinds of responses that do nothing to >address the issue at hand? > >"My question is "What percentage of ingested calories are excreted?" Probably none. If you don't use what you take in it gets stored as fat. I suppose some of what you excrete might have caloric value in which case disregard my previous statement. > Am I the only one that is amazed how a well formulated and interesting > question can turn into all kinds of responses that do nothing to > address the issue at hand? > > "My question is "What percentage of ingested calories are excreted?" I said "it depends". My answer still stands. > Am I the only one that is amazed how a well formulated and interesting > question can turn into all kinds of responses that do nothing to > address the issue at hand? > > "My question is "What percentage of ingested calories are excreted?" I have never seen this seriously addressed. Another way of posing the question might be: - Since dung has been used for fuel since time immemorial, we know that it burns. - Calories are measured by burning food in a Bulb Calorimeter. - It follows that at least part of the energy measured by the Bulb Calorimeter must end up in dung and therefore not around your waist. I would speculate that the pass-through is dependent on the individual's metabolism and other factors that would be difficult to quantify. It does seem like a rather large energy leak in the theory, however. SignatureSteve I wonder if the burning dung is full of indigestible fiber? > > Am I the only one that is amazed how a well formulated and interesting > > question can turn into all kinds of responses that do nothing to [quoted text clipped - 16 lines] > metabolism and other factors that would be difficult to quantify. It does > seem like a rather large energy leak in the theory, however. > - Since dung has been used for fuel since time immemorial, we know that it > burns. [quoted text clipped - 3 lines] > - It follows that at least part of the energy measured by the Bulb > Calorimeter must end up in dung and therefore not around your waist. The dung of ruminants is burned, not human crap. Human crap looks and smells very different from cow/sheep/elephant/whatever crap. Hmmm, yet another argument against eating grass. My answer was saying that the percentage is low. I just wish I had checked my spelling. How could I call ASDLC AFDC? My reader does have a spelling checker, but every once in a while it just skips that step and sends whatever I wrote. [Thank you Bill Gates] > Am I the only one that is amazed how a well formulated and interesting > question can turn into all kinds of responses that do nothing to > address the issue at hand? > > "My question is "What percentage of ingested calories are excreted?" |
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