Guest guest Posted September 9, 2006 Report Posted September 9, 2006 WG, You asserted that the human body can only absorb 50g of protein per meal in your reply, and I am interested in understanding more about this. I have previously heard it stated that the most protein a human body can absorb in one meal is 30g. Unfortunately, I have also read that these numbers do not come from scientific research. I personally do not know the answer, and I am confused by the varying assertions made by others. Perhaps you could cite a report/study/experiment that demonstrates the 50g limit and describe briefly how they came to their conclusion. In addition, if you happen to know, do you think an individual's body weight/size would affect the amount of protein a human could absorb from one meal? And how far apart do 50g meals need to be spaced in order to optimize absorption of protein? Thanks in advance for any light you can shed on this topic! Crain LA, CA > > Bryce, > I give the nutrition " lecture " at our Club Coach Course. As far as I > know Mike Burgener is the only USA Weightlifting instructor whos does > this. The purpose is to expose new coaches to the protein, carb and > fat requirements of athletes. > From a strictly practical point of view one of the biggest > difficulties for an athlete in heavy training is meeting their > protein requirements of approx, 1 gram of protein per lb. of > bodyweight. This is due primarily to, A. The body's inability to > absorb more than 50 grams of protein per meal, and, B. Excess protein > gets turned into ammonia and then urea (hard on the liver). > > However, in order to maintain positive nitrogen balance according to > Gontezea's research in the early 70's at the Institute of Medicine in > Bucharest, athletes exercising 2 hrs. a day require more than 1.5 > grams per kilo bodyweight. A two hour workout at that level of > protein intake caused them to go negative in four days. > > Sauberlich HE, Skala JH, Dowdy RP Laboratory Tests for the Assessment > of Nutritional Status. Clevland,OH:CRC Press, 1976 > > Colgan M, Fielder MS, Colgan LA. Micronutrient status of endurance > athletes effects hemotology and performance. J Appl Nutr 1991;43:16-30 > > Romainian Weightlifters thrived on 2.2g/kg/day to 3.5g/kg/day in this > study,where the athletes experienced a 6% increase in lean muscle > mass and a 5% increase in strength: > Kishi H, Folkers K. Imporved and effective assays of glutamic > oxaloacetic transaminase by the coenzyme-apoenzyme principle. J. Nutr > Sci Vitamin 1976;22:225-234. > > Protein intake is entirely contingent of the level of training > intensity. > > I usually charge for doing someone else's homework, > > W.G. > Ubermensch Sports > San Diego, Ca. Quote
Guest guest Posted September 10, 2006 Report Posted September 10, 2006 Hi , At the moment no one can be sure of the exact amount of protein the human body can absorb in each meal. There are too many factors to be considered (health or disease, correct enzymes profile, meal combinations and macronutrient partitions, sedentary life, hormonal levels, high intensity activity, etc..) and everyone is different. I hope reliable scientific studies will be carry out soon, specially for athletic population that's why all we are here. Cheers, Luca Cardilli Oxford, Oxfordshire, UK WG, > > You asserted that the human body can only absorb 50g of protein per > meal in your reply, and I am interested in understanding more about > this. I have previously heard it stated that the most protein a > human body can absorb in one meal is 30g. Unfortunately, I have > also read that these numbers do not come from scientific research. > > I personally do not know the answer, and I am confused by the > varying assertions made by others. Perhaps you could cite a > report/study/experiment that demonstrates the 50g limit and describe > briefly how they came to their conclusion. In addition, if you > happen to know, do you think an individual's body weight/size would > affect the amount of protein a human could absorb from one meal? > And how far apart do 50g meals need to be spaced in order to > optimize absorption of protein? > > Thanks in advance for any light you can shed on this topic! > > Crain > LA, CA > > >> >> Bryce, >> I give the nutrition " lecture " at our Club Coach Course. As far as > I >> know Mike Burgener is the only USA Weightlifting instructor whos > does >> this. The purpose is to expose new coaches to the protein, carb > and >> fat requirements of athletes. >> From a strictly practical point of view one of the biggest >> difficulties for an athlete in heavy training is meeting their >> protein requirements of approx, 1 gram of protein per lb. of >> bodyweight. This is due primarily to, A. The body's inability to >> absorb more than 50 grams of protein per meal, and, B. Excess > protein >> gets turned into ammonia and then urea (hard on the liver). >> >> However, in order to maintain positive nitrogen balance according > to >> Gontezea's research in the early 70's at the Institute of Medicine > in >> Bucharest, athletes exercising 2 hrs. a day require more than 1.5 >> grams per kilo bodyweight. A two hour workout at that level of >> protein intake caused them to go negative in four days. >> >> Sauberlich HE, Skala JH, Dowdy RP Laboratory Tests for the > Assessment >> of Nutritional Status. Clevland,OH:CRC Press, 1976 >> >> Colgan M, Fielder MS, Colgan LA. Micronutrient status of endurance >> athletes effects hemotology and performance. J Appl Nutr > 1991;43:16-30 >> >> Romainian Weightlifters thrived on 2.2g/kg/day to 3.5g/kg/day in > this >> study,where the athletes experienced a 6% increase in lean muscle >> mass and a 5% increase in strength: >> Kishi H, Folkers K. Imporved and effective assays of glutamic >> oxaloacetic transaminase by the coenzyme-apoenzyme principle. J. > Nutr >> Sci Vitamin 1976;22:225-234. >> >> Protein intake is entirely contingent of the level of training >> intensity. >> >> I usually charge for doing someone else's homework, >> >> W.G. >> Ubermensch Sports >> San Diego, Ca. Quote
Guest guest Posted September 10, 2006 Report Posted September 10, 2006 Hi . I, too, was under the old assumption of 30 grams per sitting. I purchased some whey protein which stated it had 50 grams of protein, which after I inquired about it, was told that was the new standard. I remember that you could take more than the 30 grams even in the old days if you took digestive enzymes such as papain. Dan Heffley Las Vegas, NV --- Luca Cardilli wrote: > Hi , > > At the moment no one can be sure of the exact amount > of protein the human > body can absorb in each meal. There are too many > factors to be considered (health or disease, > correct enzymes profile, meal combinations and > macronutrient partitions, > sedentary life, hormonal levels, high intensity > activity, etc..) and > everyone is different. > > I hope reliable scientific studies will be carry out > soon, specially for > athletic population that's why all we are here. > > Cheers, > > Luca Cardilli > Oxford, Oxfordshire, UK > > WG, > > > > You asserted that the human body can only absorb > 50g of protein per > > meal in your reply, and I am interested in > understanding more about > > this. I have previously heard it stated that the > most protein a > > human body can absorb in one meal is 30g. > Unfortunately, I have > > also read that these numbers do not come from > scientific research. > > > > I personally do not know the answer, and I am > confused by the > > varying assertions made by others. Perhaps you > could cite a > > report/study/experiment that demonstrates the 50g > limit and describe > > briefly how they came to their conclusion. In > addition, if you > > happen to know, do you think an individual's body > weight/size would > > affect the amount of protein a human could absorb > from one meal? > > And how far apart do 50g meals need to be spaced > in order to > > optimize absorption of protein? > > > > Thanks in advance for any light you can shed on > this topic! > > > > Crain > > LA, CA Quote
Guest guest Posted September 10, 2006 Report Posted September 10, 2006 I will continue to try and find my reference for the 50 gram guidline for single sitting protein absorbtion. Meanwhile I will toss this smoke grenade to cover my temporary retreat until I can track down my source. Re; The 30 grm at one sitting theory: There is also the additional problem in assuming that everyone extracts protein and breaks it down with equal efficiency into its constituent amino acids. We also have to assess how much of that broken down protein is used for tissue growth and repair, and how much of it is used metabolically as a general source of fuel - and, of course, how much of it goes to waste. This tale of 30gm of protein absorption at a time is far too confounded by many factors like this for it to be regarded as being scientifically valid or meaningful. I am also curious to know how that figure was arrived at and how the difference between protein catabolism and protein absorption was assessed, Were radioactive markers on certain chemical molecules or elements traced from food to bloodstream or other subsystems of the body? Maybe Lyle and other nutritional experts would be able to cast more light on such issues. - Mel Siff W.G. Ubermensch Sports San Diego, Ca. > >> > >> Bryce, > >> I give the nutrition " lecture " at our Club Coach Course. As far as > > I > >> know Mike Burgener is the only USA Weightlifting instructor whos > > does > >> this. The purpose is to expose new coaches to the protein, carb > > and > >> fat requirements of athletes. > >> From a strictly practical point of view one of the biggest > >> difficulties for an athlete in heavy training is meeting their > >> protein requirements of approx, 1 gram of protein per lb. of > >> bodyweight. This is due primarily to, A. The body's inability to > >> absorb more than 50 grams of protein per meal, and, B. Excess > > protein > >> gets turned into ammonia and then urea (hard on the liver). > >> > >> However, in order to maintain positive nitrogen balance according > > to > >> Gontezea's research in the early 70's at the Institute of Medicine > > in > >> Bucharest, athletes exercising 2 hrs. a day require more than 1.5 > >> grams per kilo bodyweight. A two hour workout at that level of > >> protein intake caused them to go negative in four days. > >> > >> Sauberlich HE, Skala JH, Dowdy RP Laboratory Tests for the > > Assessment > >> of Nutritional Status. Clevland,OH:CRC Press, 1976 > >> > >> Colgan M, Fielder MS, Colgan LA. Micronutrient status of endurance > >> athletes effects hemotology and performance. J Appl Nutr > > 1991;43:16-30 > >> > >> Romainian Weightlifters thrived on 2.2g/kg/day to 3.5g/kg/day in > > this > >> study,where the athletes experienced a 6% increase in lean muscle > >> mass and a 5% increase in strength: > >> Kishi H, Folkers K. Imporved and effective assays of glutamic > >> oxaloacetic transaminase by the coenzyme-apoenzyme principle. J. > > Nutr > >> Sci Vitamin 1976;22:225-234. > >> > >> Protein intake is entirely contingent of the level of training > >> intensity. > >> > >> I usually charge for doing someone else's homework, > >> > >> W.G. > >> Ubermensch Sports > >> San Diego, Ca. > Quote
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