Whey isolate and IGF-1

[Guest guest]

Well, here's one website that seems to indicate that whey isolate

does not contain much IGF-1. I mentioned this earlier, but here is

the info itself:

http://www.articlesbase.com/nutrition-articles/whey-proteins-which-is-

better-isolate-or-concentrate-561657.html

" The two most common whey protein supplements are whey protein

concentrate (WPC) and whey protein isolate (WPI). WPC is produced by

a process known as ultrafiltration, a low temperature process that

uses pressure and a porous membrane to separate the fat and lactose

from untreated sweet whey. This produces a product with approximately

78-83% protein, 6-8 % fat and 4-6% lactose. To produce WPI, WPC is

further processed using either cross-flow microfiltration (CFM) or

microflitration (MF), both of which further separate whey protein

from fat and lactose using high-tech ceramic filters. This produces a

WPI comprised of approximately 90% protein, <1% fat and <1% lactose.

A third process known as Ion-Exchange can also be used to produce

WPI, but this method is now considered obsolete due to the effects of

the harsh treatments involved, denaturing the native protein

fractions.

Whilst WPI is marketed as a superior product to WPC, in most respects

it is actually inferior due to its significantly lower levels (WPC

contains up to 800% more) of a group of bioactive compounds known

as 'growth factors' (IGF-1, IGF-2, TGF-B, PDGF and FGF). These growth

factors are contained within the fat globule membrane of whey, but

the further filtration required to produce WPI, also removes these

beneficial fat globules in order achieve a fat content of less than

1%. Oral absorption of growth factors has been well documented and

they have been shown to help improve wound healing as well as various

afflictions of the gastrointestinal tract. They are also thought to

exhert an anabolic effect if whey consumption is high enough. "

AH HA!!!! So -- here we see that if IGF-1 is a big issue with cancer,

then whey concentrate should be avoided while whey isolate apparently

does not pose any problem.