Yes you can eat raw eggs/whites, but the whole eggs or carton eggs must be pasteurized (it will say so on the carton). Pasteurization is when they heat the egg/egg product enough to kill all the bacteria (including salmonella) and the protein digestion inhibitors (usually126-140 degrees). If you eat non-pasteurized eggs/egg products your body cannot utilize the protein in them due to the presence of a protein inhibitor. And while you may get salmonella from raw eggs/egg product the chances are 1 in 10,000 for regular eggs and 1 in 30,000 for free range eggs.
Avidin is a glycoprotein, which is found in raw egg whites, and blocks the uptake of Vitamin B6 and Vitamin H (Biotin) causing a vitamin deficiency (it binds to Biotin and iron making them unavailable). You must cook/pasteurize the egg white to neutralize the Avidin and allow your body to safely digest the protein and utilize all its amino acids. Cooking egg whites at high temperatures denatures some of the amino acids which makes the proteins slightly less effective (slower digesting). A soft boiled or poached egg (at 70% albumin coagulation) is digested much easier as opposed to a fried or hard boiled egg. 2 soft boiled/poached eggs spend less than 2 hours in the stomach being digested, where 2 fried/hard boiled eggs spend over 3 hours in the stomach. Although fried/hard cooked eggs are digested just as completely as soft cooked eggs, it just takes longer for them to be completely digested and assimilated.
An egg white is about 10% protein and 90% water. It’s the proteins that cause the egg white to solidify when you cook it. Egg white proteins are long chains of amino acids. In a raw egg, these proteins are curled and folded to form a compact ball. Weak bonds between amino acids hold the proteins in this shape—until you turn up the heat. When heated, the weak bonds break and the protein unfolds. Then its amino acids form weak bonds with the amino acids of other proteins, a process called coagulation. The resulting network of proteins captures water, making a soft, digestible gel.
If you keep the heat turned up too high or too long when you cook an egg, the proteins in the egg white form more and more bonds, squeezing some of the water out of the protein network and making the egg white rubbery and increasing their digestion time.
So, basically the most bio available and readily assimilated egg proteins are either pasteurized raw eggs/egg products or soft cooked/poached eggs that have not reached 160 degrees at which point the proteins become coagulated/denatured and take longer to be completely digested and assimilated. I hope this helps clear up some questions .
If you want to save some money you can do this at home.It is possible to pasteurize eggs at home - and easily, too! Pasteurization is simply a process of heating a food to a specific temperature for a specific amount of time - designed to kill specific bacteria. It is known that salmonella bacteria are killed at temperatures of 140 degrees in about 3 1/2 minutes (or a higher temperature in less time). If a room temperature egg is held in a bowl of warm water - say, 142 degrees to be safe - for 3 1/2 minutes, the bacteria will be killed and the protein inhibitor neutralized. It takes 5 minutes for extra large or jumbo eggs.
Place the room temperature eggs in a colander, and lower them into a pan or bowl of 142-degree water. Use an instant-read thermometer to be sure of the water temperature, and leave the thermometer in the water, to be sure that the temperature is maintained. For medium or large eggs, leave them in the water for 3 1/2 minutes; for extra large or jumbo eggs, allow 5 minutes. Then remove the eggs, dry them, and refrigerate them, in a tightly-covered container.
Eggs begin to cook at about 160 degrees, and will be "scrambled eggs" at 180 - but if the 142 degree temperature is maintained, the result is a safe egg that will act like a raw egg in recipes and will provide a fully usable protein source.
08-04-2012, 09:26 PM #1
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Quality post on eggs, egg absorption and bioavailability!
08-04-2012, 09:37 PM #2
08-05-2012, 08:25 AM #3
If you eat non-pasteurized eggs/egg products your body cannot utilize the protein in them due to the presence of a protein inhibitor
Truth: Your body CAN use some of the protein in raw eggs.
Truth: Pasteurization by itself DOES NOT improve digestibility nor does it inactivate the inhibitors since the temp is too low to denature the egg protein and enzyme inhibitors.
- You must cook/pasteurize the egg white to neutralize the Avidin
Truth: Avidin is stable WELL OVER 100 degrees C.
- Cooking egg whites at high temperatures denatures some of the amino acids
Truth: Amino acids don't denature (seriously has this phaggot taken a biochem class???)
- proteins become coagulated/denatured and take longer to be completely digested and assimilated
Truth: Denaturing actually speeds digestion.
Last edited by rhizome; 08-05-2012 at 08:49 AM.