Is glycerin keto? Only when the package uses a little
FDA lists it as a nutritive sweetener, so it has calories. If glycerin is near the top of the ingredient list, count it. A trace in a glaze is a much smaller dose.
The full answer
Glycerin is not a free keto ingredient. The FDA lists it as a nutritive sweetener, which means it supplies calories. Vegetable glycerin is the same ingredient.
A trace in a glaze or a sausage casing is a small dose. A bar is different. EFSA found glycerin on about a quarter of snack and energy bars, and at more than 5% in some bakery products and chewing gum.
On a US label, ingredients are listed by weight, heaviest first. If glycerin or glycerol is near the top, it is a real part of what you're eating, even when the front says sugar-free.
For sweetness that FDA does not class as nutritive, compare products sweetened with stevia, monk fruit, allulose or erythritol.
What to look for on the label
- Glycerin or glycerol near the top of the ingredient list
- "Vegetable glycerin" still counts; it names the source, not the calories
- A sugar-free or keto banner can still hide a large amount
Other diets
Common questions
Does vegetable glycerin have calories?
Yes. Vegetable only tells you it came from plant oil. The FDA still classes glycerin as a nutritive sweetener.
Is glycerin the same as glycerol?
Yes. Glycerin is the name on most US labels. Glycerol is the name in the EU and in scientific reports. Both are E422.
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