^^^^^^Just read a big old study. Guess where the most potent insulin secretion from milk is coming from?
WHEY
OOOPS!
Here's the end of the study:
The results of the current study show that milk proteins have
insulinotropic properties, with the whey fraction being a more
efficient insulin secretagogue than casein. It remains to be shown whether the insulinotropic effect of whey and milk depends on an optimal and rapid postprandial release of certain amino acids to the blood, the release of a bioactive peptide, or an activation of the incretin system, particularly by enhancing GIP secretion.
Also, the potential long-term effects of a noncarbohydrate–mediated insulin stimulus on metabolic variables should be evaluated in healthy persons and in persons with a diminished capacity for insulin secretion.
**********************************************
Whey by itself is much more potent insulin wise than just the milk.
I wouldn't get to caught up in it unless your diabetic. Like I've said before we are getting insulin spikes all over the place but in this case you'd be better off with just the milk and not the shake! Casein is less potent according to the study but it does have a insulin affect. Proteins in general do.
http://www.ajcn.org/cgi/reprint/80/5/1246