From Biochemisty of Nutrition by Jerry Wilson,
"Glycerin is a by-product of fat metabolism. It can also be ingested as an ingredient in some foods. Glycerin is metabolized much like carbohydrates, except that there is no corresponding increase in either insulin levels or blood glucose."

So glycerin does NOT raise glucose levels.

But I think it's more important to follow Dr. Atkins advice at this point since it is his diet:

http://atkinscenter.com/helpatkins/...ucts/index.html


quote:
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Is it true that Advantage bars are higher in carbs than it says on the label? Is that because the glycerin and fiber are not counted?
Atkins products are specifically formulated to minimize the impact of carbohydrates on blood sugar level because elevated blood sugar and the resulting excess insulin production can inhibit weight loss and weight management and increase the risk of disease and illness.

We accomplish this in our product formulation by understanding that not all carbohydrates behave the same way in a person's body. Some carbs, such as glycerin, are digested by your body but not turned into glucose. And, other carbs—such as fiber—impart as little as 0 calories per gram, are not digested at all and pass through your body as waste. In either of these last two cases there is no noted impact on blood sugar levels. However, the FDA and other health organizations have not yet focused on this important biochemical difference and treat all carbohydrates as the same.

The nutritional information on Atkins food products is intended to help consumers understand exactly how we formulate our products so that the consumer has the knowledge necessary to follow a controlled carbohydrate nutritional approach and eat healthy foods. Thus, for AtkinsTM Advantage Bars, the "net" carb count listed in the Total Carbohydrate statement is completely accurate for Atkins followers, and the "gross" carb count matters very little.

However, the FDA now wants the glycerin content of all products to be reflected in total carbohydrate count, so in the future you may see a higher carbohydrate gram count on the labels of AtkinsTM Advantage Bars and other products that include glycerin and other noncaloric sweeteners. But remember, net carbs are the only the carbs you need to count when you do Atkins.


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Bonnie's sticky on glycerin on this forum is close, but she blames the gas and bloating on glycerin when it is more likely to come from the polyols (sugar alcohols) that are digested in the large intestine. And she also says glycerin raises blood sugar which contradicts what Dr. Atkin's says above. He equates glycerin with fiber and says to subtract it completely.