Does Mint Water Break a Fast?

No, unsweetened mint water generally does not break an intermittent fast because steeped mint leaves contribute very few calories to the water.

Does mint water break a fast?

For most people using intermittent fasting as a schedule for meals, plain water infused with mint leaves is unlikely to make a practical difference to the fast. That answer assumes you drink the strained water without eating the leaves or adding sweeteners.

Guidance for steeped infused water puts it at usually under 10 kcal per glass, although the exact amount in mint water depends on how it is prepared. Use the intermittent fasting timer to plan your fasting and eating windows.

That estimate is not a proven calorie threshold below which a fast remains intact. Fasting definitions differ: a person avoiding substantial calorie intake may accept mint water, while someone following a plain-water-only fast would not. For a medical test or procedure, follow the instructions from your care team rather than applying a general intermittent fasting rule.

How many calories are in mint water, and does it affect insulin?

Steeping mint leaves in water adds flavor and small amounts of plant compounds; it does not transfer all the leaves' contents into the drink. The calorie estimate for infused water is not the same as the calorie content of the whole mint leaves, and it should not be treated as an exact measurement for every glass.

Eating the leaves adds food to the fast. Sugar, honey, syrup or other calorie-containing additions also change the drink, so leave them out if your goal is to avoid calories during the fasting window. Even a product labeled zero-calorie is not necessarily plain water, which matters if your rules permit only water.

There is no direct human evidence in the available research establishing how mint water affects insulin during a fast. Its low calorie content suggests it is unlikely to have a substantial effect on a practical intermittent fast, but it does not prove that the insulin response is exactly zero.

The available animal study examined drinks containing peppermint alongside several other ingredients in rats fed a high-fat, high-fructose diet. It did not test plain mint water in fasting humans, and it cannot establish an insulin effect from mint alone.

Does the answer change by fasting type?

Intermittent fasting

Unsweetened, strained mint water is generally compatible with an intermittent fasting routine aimed at limiting when you eat. Keep the preparation simple, and treat any calorie-containing additions or eaten leaves as food rather than assuming everything in the glass is calorie-free.

If your particular plan has stricter rules, follow those rules. The small estimated calorie content of infused water is a practical guide, not a guarantee that the drink meets every definition of a fast.

Plain-water fasting

For a fast that permits only plain water, skip mint water. Infusing leaves adds flavor and plant compounds, so the resulting drink is no longer just plain water, even if it contains very few calories.

For fasting before a blood test, surgery or another procedure, ask the clinical team what you may drink. Some instructions allow plain water; others may restrict it as well.

Fasting for autophagy

Autophagy is a normal cellular recycling process, not a switch that can be checked by looking at a drink's calorie estimate. The available study does not show whether mint water affects autophagy in fasting humans.

If your goal is to avoid any uncertainty about consuming plant compounds, choose plain water. Neither mint water nor a particular fasting schedule can be assumed to produce a specific autophagy result.

How can you prepare mint water for a fast?

For a simple, unsweetened infusion, use:

• 1 liter water, about 4¼ US cups
• 8–12 fresh mint leaves or 2 sprigs, about 5 g

1. Rinse the mint leaves under running water.
2. Add the mint to the water and refrigerate for 2–4 hours.
3. Strain out the leaves and keep the mint water refrigerated. Drink it within 24 hours for best flavor; discard it after 2–3 days or sooner if it becomes cloudy, slimy or sour-smelling. Do not leave it at room temperature for more than a few hours.

If you have diabetes, take blood-sugar-lowering medication, are pregnant or have a history of an eating disorder, speak with a clinician before fasting. Do not change medication to accommodate a fast. Stop fasting and seek urgent medical care for fainting or confusion.