Well, I hate to be the bearer of bad news, but whey is actually one of the most efficiently absorbed proteins. If you look at studies like
this one, which as far as I am aware is the primary source cited that has compared a multitude of different protein absorption rates at once. Scroll down to page 8 (page 136 if you're looking at the top left numbers on the pages) and look at table 2 (or do a ctrl+F for "Table 2".
The do say the absorption rates stated are
estimates, but are sufficient approximates. They mention the lack of direct data pertaining specifically to amino acid absorption in the units of grams per hour per kg of body weight.
Note: that study also has some interesting stuff about different protein types and their effect on insulin and other hormone responses. It was found that beef is by far the
Here is the table. A few points:
- Data is sorted from slowest to fastest absorption. You can see whey protein is the fastest.
- Theoretically, or at least AFAIK it hasn't been proven, faster absorption means you can ingest more and still make use of it, versus ingesting more and having it pass through the small intestines untouched.
- There is still the question as to whether the large intestines plays any role in amino acid/protein absorption, because it does contain the transporters necessary, so it very well could we just haven't had the right study to prove it yet.
- Absorption rate is not the only factor at play here. Take a good long read of this wikipedia article on
Protein Quality. There are many other factors at play, such as:
PDCAAS aka Protein digestibility-corrected amino acid score and
DIAAS aka Digestible Indispensable Amino Acid Score.
- PDCAAS is the current ranking standard by the Food and Agriculture Organization since 1993, however DIAAS was proposed as a replacement in 2013, if doesn't appear that tas much kee0
- Usually casien, whey, egg, and (surpisingly, soy) are rated a 1.0 in the PDCAAS (the highest score that can be given). Chicken has a score of 0.95, beef is 0.92, black beans are 0.75, and crickets are 0.687.
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My first thought when seeing this is, okay that's great, so how do I slow down my digestion? I want stuff to sit in my small intestines longer so more can absorb. One easy thing to do is just acquire a large opioid or benzodiazepine habit! That will significantly slow down gastric motility. But be care because you will end up a homeless addict. Fly too close to the sun and all that or something...
There are some who asset that the faster protein is absorbed, the more ends up being oxidized rather than actually utilized.
As I said earlier, there are several things we can do to try to help our bodies make the most of our protein intake:
- Chew the fuck out of our food! Chewing mechanically breaks down the food (again, preferably chew until it is a smoothie like consistency). It also releases digestive enzymes into your saliva to help with digestion. The last thing we want is a 1 cubic inch chunk of steak sitting in the stomach.
- Eat fibrous foods with your protein. This will help to slow down digestion. A smoothie moves through your intestines faster than
- Mix different types of protein and time them appropriately. Often times for me, post workout I always down 15g of EAAs or 25g of whey to get MPS started and give my body some fast-acting fuel to build muscle. Then comes the chicken or salmon or turkey sardines or eggs--whatever I am eating at that time (I really don't eat beef for environmental reasons).
So yeah, absorption rate isn't the full picture and
we know it because there's been studies where people have gone way over the theoretical limit for their protein intake-to-utilization amount and still saw additional benefits to body composition. So while we have a ton of research, we don't know it all and there's still much to learn.
Regardless, I feel protein absorption is a good thing to take into consideration. Don't go downing 80g of egg protein in a sitting, you will just oxidize most of it and poop it out.
That's really all I can crank out right now. There's definitely more I could add but I am done writing, but hopefully this helps! All I can say is this: Whey protein is good shit. It is definitely worth consuming along with other proteins like chicken, eggs, fish, and EAAs
Edit:
@FR0Z3N_B0MB34 one last thing to note for you.
The anabolic response to a meal is NOT limited by max stimulation of muscle protein synthesis--there are other factor at play as well. There are other hormones and bodily processes at play here, but I can't really say what they are or anything off the top of my head--I don't even think the research really knows THAT level of detail.