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MMartial wrote: Hey DJ,
there's a lot of sources but here's a excerpt from " www.extremenutrition.co.uk/news_and_articles/whey.php ". Spoke to a food specialist and he gave me the same story. Isolate has a low soluble level which makes absorption difficult for the body. That's why companies must always add other stuff with it. The isolate blends on the market has a protein index of like 72g/100g of protein which is still low considering isolate has a 90% up protein content. Will see if I can find the source referring to the specific amino acid content. The article at the bottom also refers to tuna, but that's not it :P. The only Isolates that uses proper Ionization is the really expensive brands like ON etc. If you use those than I stand corrected
"People should not be under the impression that a quality concentrate is inferior to Isolate and may in fact be a superior choice, depending on the goals of the person. For example, some people don’t tolerate lactose well or are trying to watch every gram of fat in their diet, etc. while another may want the benefits of the additional compounds found in a high quality concentrate.
Isolates can contain as much as 90%+ of protein. Research has found that only whey proteins in their natural state have biological activity. The necessary amount of processing carried out upon a whey protein to remove the lactose, fats, etc. without losing its biological activity takes special care by the manufacturer, and incurs the relevant financial penalty that accompanies this level of work. Maintaining the natural state of the protein is essential to its anti-cancer and immune stimulating activity, the protein must be processed at low temperatures if it is not to alter the natural state of the protein.
These processes are micro filtering, cross flow filtration and ion exchange. These filtration methods create isolated protein, but at the same time they take away some good compounds found in a good concentrate and can also reduce the number of amino acids present in isolate compared to concentrate. It gets back to choice and what you goal is. I know I'd prefer to have a concentrate and get the added benefits that it brings rather than go for the lower fats and miss out on my amino acids."
So that's just what I've gathered. Feel free to correct me if I'm wrong
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