I'm suspicious of all the protein powders and they all give me a powerful jolt as if I've just eaten sugar. And they leave me feeling deflated a short time later. I'm guessing it is the huge rush of insulin that does that.

If you really want to see what protein powder is doing for your weight loss (or lack thereof) try eliminating it for a few weeks. If you feel you must have protein following weight training, try a piece of meat or poultry. It will provide just as much protein without the insulinogenic effect of whey protein.

Have you read The TNT Workout by Jeff Volek (a leading LC researcher and physiologist) and a guy from Men's Health Mag? It is specifically built around a LC diet and has different tweaks for those who want to lose, maintain and gain weight. They recommend protein powder for some, but suggest subs for others. It's available for as little as a penny + postage on Amazon and it's a worthwhile read. Good luck.