Does honey break a fast?
Honey breaks a fast. It is roughly 82% sugar — a teaspoon is about 21 calories and 6 grams of carbohydrate — and it raises blood glucose and insulin. Raw and manuka honey break a fast on exactly the same terms as ordinary honey; the glycaemic index of honey varies by variety, but no variety is metabolically free.
| Fasting for | Verdict | Why |
|---|---|---|
| Weight loss | Breaks it | Approximately 21 kcal per teaspoon, and it is rarely measured accurately. |
| Autophagy | Breaks it | Sugar raises insulin, which suppresses autophagy. Any amount counts. |
| Blood work | Breaks it | Not permitted. It will alter a glucose reading directly. |
| Ketosis | Breaks it | Approximately 6 g of carbohydrate per teaspoon will interrupt ketosis. |
| Gut rest | Breaks it | Sugars require digestion and absorption. |
Why
Honey is a concentrated solution of glucose and fructose with trace enzymes and phenolic compounds. The sugars are absorbed and raise blood glucose and insulin, which is the textbook definition of breaking a fast, and the trace compounds do not change that arithmetic. Two lines of evidence are worth having, because the "raw honey is different" claim is common. A randomised clinical trial of six Greek honey varieties in healthy subjects measured their glycaemic responses directly, and separate work found US honeys varying substantially in glucose and fructose content nonetheless elicited similar glycaemic indexes. Variety changes the details; it does not produce a honey that behaves like a non-food.
Approximately 21 kcal and 6 g carbohydrate per teaspoon (7 g).
The exceptions
This is usually where the real question lives.
- Raw, unfiltered and manuka honey all break a fast. "Unprocessed" is not "non-caloric".
- Honey in tea is the most common way people break a fast without intending to.
- Honey is not safe for infants under 12 months, which is unrelated to fasting but worth knowing.
- If you are ending a fast, honey is a fast-absorbing sugar and a reasonable choice for that specific purpose.
Sources
- Short-term effects of six Greek honey varieties on glycemic response: a randomized clinical trial in healthy subjects — Eur J Clin Nutr, 2018PMID 29686412
- US honeys varying in glucose and fructose content elicit similar glycemic indexes — J Am Diet Assoc, 2006PMID 16863724
- FoodData Central — USDA Agricultural Research Service, 2026
No clinician reviews this site. Sources on this entry were verified by the author, who is not a doctor or a dietitian — what that means.
Last updated 2026-08-15.
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