Peppermint tea does not break a fast. A cup brewed with water has about 2 calories and no caffeine, so it leaves insulin, ketosis and weight loss alone. Many people use its strong, fresh taste to get past a craving late in the fast.
| Calories | ~2 kcal per cup |
|---|---|
| Breaks a weight-loss fast? | No |
| Breaks ketosis? | No |
| Breaks autophagy? | Unlikely |
| Insulin impact | Negligible |
Steeping peppermint leaves releases menthol and other aromatic compounds into the water, with almost no energy. USDA data put brewed herbal teas at about 1 calorie per 100 ml. That is far below anything that would raise insulin or end a fast.
Peppermint is a traditional remedy for an upset stomach, and peppermint oil capsules have reasonable evidence for irritable bowel symptoms. Peppermint tea appears safe, though research on the leaf itself is limited. Peppermint can trigger heartburn or reflux in some people, which may be more noticeable on an empty stomach. Bottled mint drinks and some blends contain sugar, so check the label.
Drink as much as you like during the fast. If it brings on heartburn, switch to chamomile or ginger tea.
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