Serious question: do you proofread your posts before you submit them? because that made absolutly no sense to me whatsoever.
First off, I'm going to assume you mea the reasoning behind any low CARB approach is to keep insulin levels low to promote fat loss.
But let me ask you this...did you know that fat can be stored even in the COMPLETE ABSENCE of insulin? it's true. Eating a high fat, hypercaloric diet WILL make you fat, even with zero carbs.
Secondly, protein (no matter the source) is insulinogenic, but a high protein diet is great for sparing muscle on low calories.
Q: "but if protein stimulates the release of insulin, won't it make me fat?"
A: NO, because no matter what, you cannot gain fat on a hypocaloric diet. Any time calories are reduced below maintenance, insulin will be lower, and fat will be mobilized and burned off.
And regarding the cortisol thing, Poliquin is dead wrong, cortisol is not implicated in subcutaneous fat storage (visceral fat, on the other hand, is).