Does apple cider vinegar break a fast?
No. A tablespoon of apple cider vinegar in water carries about 3 calories and does not break a fast.
At the doses people actually use — a teaspoon to a tablespoon diluted in a glass of water — there is not enough carbohydrate to interrupt a fasted state.
The fasting question is the easy part. The part worth more of your attention is that undiluted vinegar is hard on tooth enamel and on the throat, so it should always go in water, and it is sensible to rinse your mouth afterwards rather than brushing straight away.
Claims that vinegar meaningfully accelerates fat loss run well ahead of the evidence. Some small studies suggest a modest effect on post-meal blood sugar. That is a long way from the results it gets marketed for, and you should not build a plan around it.
Apple Cider Vinegar in Warm Water
Ingredients
- Raw apple cider vinegar (with the mother) — 1 tsp
- Warm water — 250 ml
Method
- Stir the vinegar into a full glass of warm water.
- Sip slowly on an empty stomach.
- Rinse your mouth with plain water afterwards.
Before you try this. Always dilute well and sip — never hold it in your mouth or brush your teeth straight after. If you take diuretics, diabetes, or heart medication, check with a professional first, as vinegar can affect potassium and blood sugar.
General information, not medical advice. Intermittent fasting is not right for everyone. Talk to a clinician before starting if you are pregnant or breastfeeding, have or have had an eating disorder, have diabetes, or take prescription medication.