Lets put to rest a myth....

[buffut1]

I read several post discussing the idea that the body can only absorb and process a certain amount of protein at a time. Some people have used varying amounts from 15-30 grams at each meal.

I hope this info will answer all questions on the subject.

Proteins are amino acids held together by peptide bonds. When they are ingested they are reduced to single amino acids or small chains to allow absorption into the blood.

Almost all protein ingested us digested and enter the blood for use by the body.

In the stomach Pesinogen is activated by hydrochloric acid into Pepsin. 15% of protein digestion occurs due to this action. Once the remain protein moves into the small intestine pancreatic enzymes (chymotrypsin. trypsin and carboxypeptidase) continue the digestion process. About 50% of protein digestion occurs here.

Brush border Enzymes are peptidases that continue to reduce proteins to small amino acid chains that can be absorbed. Occasionally small polypeptides may be reduced to single amion acids within the cytoplasm of the mucosal cells. This final protein digestion by th brush border enzymes accounts for 35% of protein digestion.

Absorption:

Rate of absorption of 2 - 3 amino acids polypeptides is usually higher than for single amino acids.

Secondary active transport system is used in the digestive tract gut epithelia nd the gut lumen and epithelial cell lumen. This transport is Na+ coupled as in glucose and galactose.

Single amino acids have specific transport systems some of which use Na+ coupled transport, sometimes this occurs by simple difusion.



SO EAT, DRINK and TAKE in PROTEIN!!

 

[Specialbear]

good post, but feels like im back in AP Biology

 

[Synpax]

Hi,

That's a good post. CAn you tell me whether I am waisting my money buying Pro Complex rather than 100% whey?

I also consume protein in servings of 55g-58g chunks. You are saying this is being used, 100%?

 

[Animal]

Depends on what kind of whey.

Also notice there is no need of INSULIN for digestion or transport of AA's!

 

[buffut1]

correct syntax, almost 100% of what you take in is digested and absorbed. If you aren't a couch potatoe, that should be used for building muscle.

Evidence is conflicting of whether or not whey protein is better. Just use what you like.

 

[serbyte]

That doesnt tell me anything. Obviously 99 percent of protein is absorbed into the blood. Most people know this.
When speaking about absorbtion, the question is not how much does your bloodstream absorb, rather it is how much of that in your blood stream is absorbed into muscle cells for growth instead of being stored as fat or used as energy.

 

[buffut1]

That is like asking how much carbs are being used for energy. It all depends on your needs.

If you sit on the couch, and aren't trying to build muslce, ie, breaking down muscle through exercise, then of course you will not need as much protein as someone who is busting their ass in the gym.

Any "unused" calories, whether they be from protein, carbs or fats, are stored as fat.

So make sure not only your protein intake is adequate, but your caloric intake isn't overdone. (this is the principle of the adkins diet).