Sugar-free gum does not meaningfully break a fast. A stick has only about two to five calories from sugar alcohols, far too little to raise insulin or end a fast, though chewing it can make some people hungrier.
| Calories | ~2-5 kcal per stick |
|---|---|
| Breaks a weight-loss fast? | No |
| Breaks ketosis? | No |
| Breaks autophagy? | No |
| Insulin impact | Negligible |
Sugar-free gum is sweetened with sugar alcohols like xylitol or sorbitol and contains only a few calories per piece. That is below any level that would raise insulin or break a fast. For most people a piece or two is completely compatible with fasting and helps with bad breath or cravings.
The real consideration is not calories but hunger: the act of chewing and the sweet taste can stimulate appetite or a small cephalic-phase response in some people. If gum makes you hungrier, use it sparingly. Regular sugar gum, of course, breaks a fast.
A piece or two during your fasting window is fine. Chewing a whole pack starts to add up in calories and may stir appetite.
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