Support for Atkins diet, Protein Power, Neanderthin (Paleo Diet), CAD/CALP, Dr. Bernstein Diabetes Solution and any other healthy low-carb diet or plan, all are welcome in our lowcarb community. Forget starvation and fad diets -- join the healthy eating crowd! You may register by clicking here, it's free!
Not specifically lowcarb, but if you want them to have some low carb data points, this could work. I joined, gave up some bodily fluids for the project, got an Amazon gift card. Plus they share the results with the participants. This is nationwide.