Hmmm, good question Carmen!
I've always believed that the healthiest way to do low-carb is to eat REAL FOOD and not rely too heavily on protein bars, etc.
However, I'll be the first to say I've been relying on Atkins bars a lot lately (like once a day!). Is it slowing my loss - maybe. But if I am in a situation where I have to eat and I don't have real food available, I'd rather eat an Atkins bar with polyols than eat carby food.
The only way I've ever seen anyone test for their sensitivity is by using a blood glucose monitor, like the kind diabetics use to test their blood sugar. Dana Carpender, at
www.holdthetoast.com, did this. She would eat a protein bar or low-carb candy and then test her blood sugar every 20 minutes for a few hours to see if her blood sugar rose in reaction to the food she ate. A rise in blood sugar after eating a polyol-laden but otherwise low-carb food would indicate that you are sensitive to the polyols.
Sorry to be so technical. I'd say, try eating REAL low-carb foods like basic meats and veggies for a week and see if you lose more. Then add in polyols slowly to see if they slow you down. Personal experimentation is probably the best way to go.
Good luck, Carmen! If you try it, let us know what you find out!