Digestibility of Raw Eggs - Bodybuilding Discussion on Bodybuilding.net Nutrition Forum

EricT · 03-21-2006, 03:29 PM

I've seen a few old threads where people talk about consuming their eggs raw for convenience. If anybody does this or is thinking about doing this, besides the salmonella factor, consider this:

Digestibility of Cooked and Raw Egg Protein in Humans as Assessed by Stable Isotope Techniques

Pieter Evenepoel, Benny Geypens, Anja Luypaerts, Martin Hiele, Yvo Ghoos4, and Paul Rutgeerts
Department of Medicine, Division of Gastroenterology and Gastrointestinal Research Centre, University Hospital Leuven, B-3000 Leuven, Belgium

ABSTRACTEgg proteins contribute substantially to the daily nitrogen allowances in Western countries and are generally considered to be highly digestible. However, information is lacking on the true ileal digestibility of either raw or cooked egg protein. The recent availability of stable isotope-labeled egg protein allowed determination of the true ileal digestibility of egg protein by means of noninvasive tracer techniques. Five ileostomy patients were studied, once after ingestion of a test meal consisting of 25 g of cooked 13C- and 15N-labeled egg protein, and once after ingestion of the same test meal in raw form. Ileal effluents and breath samples were collected at regular intervals after consumption of the test meal and analyzed for 15N- and 13C-content, respectively. The true ileal digestibility of cooked and raw egg protein amounted to 90.9 ± 0.8 and 51.3 ± 9.8%, respectively. A significant negative correlation (r =

0.92, P < 0.001) was found between the 13C-recovery in breath and the recovery of exogenous N in the ileal effluents. In summary, using the 15N-dilution technique we demonstrated that the assimilation of cooked egg protein is efficient, albeit incomplete, and that the true ileal digestibility of egg protein is significantly enhanced by heat-pretreatment. A simple 13C-breath test technique furthermore proved to be a suitable alternative for the evaluation of the true ileal digestibility of egg protein.

EricT · 03-23-2006, 04:00 PM

I know that this topic has come up a lot on other boards too.

This is the most common answer: "I've been doing it for years and had no problem..."

Just about the silliest, unscientific response I can think of. However, problems were not the point of me posting this. Heck, the avidin in raw eggs whites tightly binds to biotin and so theoretically could cause a biotin defeciency. But that doesn't mean you're guaranteed one.

The point is that if you eat them raw your wasting a great deal of the protein.

Dr X · 03-23-2006, 08:17 PM

Didn't I just post a thread on this or was that somewhere else. Can't keep up anymore. Must be my age.

EricT · 03-23-2006, 08:20 PM

Quote:

Originally Posted by Dr X

Didn't I just post a thread on this or was that somewhere else. Can't keep up anymore. Must be my age.

I'm almost positive you didn't post it here. At least not any time recently.

Maybe at bulk? If you did it here then forgive me. Was it the study or something else?

03-21-2006, 03:29 PM	#1 (permalink)
EricT Moderator Rank: Heavyweight Experience: 7-10 Years Join Date: Jul 2005 Posts: 5,844 Country: Gender:	Digestibility of Raw Eggs I've seen a few old threads where people talk about consuming their eggs raw for convenience. If anybody does this or is thinking about doing this, besides the salmonella factor, consider this: Digestibility of Cooked and Raw Egg Protein in Humans as Assessed by Stable Isotope Techniques Pieter Evenepoel, Benny Geypens, Anja Luypaerts, Martin Hiele, Yvo Ghoos4, and Paul Rutgeerts Department of Medicine, Division of Gastroenterology and Gastrointestinal Research Centre, University Hospital Leuven, B-3000 Leuven, Belgium ABSTRACTEgg proteins contribute substantially to the daily nitrogen allowances in Western countries and are generally considered to be highly digestible. However, information is lacking on the true ileal digestibility of either raw or cooked egg protein. The recent availability of stable isotope-labeled egg protein allowed determination of the true ileal digestibility of egg protein by means of noninvasive tracer techniques. Five ileostomy patients were studied, once after ingestion of a test meal consisting of 25 g of cooked 13C- and 15N-labeled egg protein, and once after ingestion of the same test meal in raw form. Ileal effluents and breath samples were collected at regular intervals after consumption of the test meal and analyzed for 15N- and 13C-content, respectively. The true ileal digestibility of cooked and raw egg protein amounted to 90.9 ± 0.8 and 51.3 ± 9.8%, respectively. A significant negative correlation (r = 0.92, P < 0.001) was found between the 13C-recovery in breath and the recovery of exogenous N in the ileal effluents. In summary, using the 15N-dilution technique we demonstrated that the assimilation of cooked egg protein is efficient, albeit incomplete, and that the true ileal digestibility of egg protein is significantly enhanced by heat-pretreatment. A simple 13C-breath test technique furthermore proved to be a suitable alternative for the evaluation of the true ileal digestibility of egg protein. Last edited by EricT; 03-21-2006 at 03:38 PM.
	EricT's Sig:I'm tired of the myth that bb'rs aren't flexible. As a group, they are extremely flexible. They have an amazing ability to bend over, place their heads between their legs, and blow smoke up their own asses.

03-23-2006, 04:00 PM	#2 (permalink)
EricT Moderator Rank: Heavyweight Experience: 7-10 Years Join Date: Jul 2005 Posts: 5,844 Country: Gender:	I know that this topic has come up a lot on other boards too. This is the most common answer: "I've been doing it for years and had no problem..." Just about the silliest, unscientific response I can think of. However, problems were not the point of me posting this. Heck, the avidin in raw eggs whites tightly binds to biotin and so theoretically could cause a biotin defeciency. But that doesn't mean you're guaranteed one. The point is that if you eat them raw your wasting a great deal of the protein.
	EricT's Sig:I'm tired of the myth that bb'rs aren't flexible. As a group, they are extremely flexible. They have an amazing ability to bend over, place their heads between their legs, and blow smoke up their own asses.

03-23-2006, 08:17 PM	#3 (permalink)
Dr X Rank: Lightweight Experience: 10+ Years Join Date: Apr 2005 Location: in the deep recesses of your mind Posts: 1,052 Country: Gender:	Didn't I just post a thread on this or was that somewhere else. Can't keep up anymore. Must be my age.
	Dr X's Sig:The Fool say in his heart "There is no God"

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