Does Cinnamon Water Break a Fast?

Partly: unsweetened cinnamon water may fit a flexible intermittent fast because it contains little energy, but it does not meet a strict water-only fast. Whether cinnamon water fits your fast depends on your rules and how you make it.

Does cinnamon water break a fast?

Plain cinnamon water made by steeping a cinnamon stick in water is unlikely to add much energy. That makes it a practical choice for some flexible fasting plans, but it is not guaranteed to be calorie-free or acceptable under every fasting protocol.

Steeped infused water generally contains less than 10 kcal per glass, but that estimate is not a measurement of a particular batch of cinnamon water. Use an intermittent fasting timer to track your fasting window alongside the drink rules you choose.

Cinnamon releases flavour and other substances into the water as it steeps. Removing the stick does not necessarily remove everything it released. If your definition of fasting permits only plain water, cinnamon water falls outside it.

How to prepare cinnamon water for a flexible fast

Use these ingredients:

1 litre of drinking water, about 4¼ cups
1 whole cinnamon stick

Add the cinnamon stick to the water in a clean container.
Refrigerate for 2–4 hours to steep, then remove the stick.
Keep the cinnamon water refrigerated and drink it within 24 hours for the best flavour.

Do not leave the cinnamon water at room temperature for more than a few hours. Discard it after 2–3 days, or sooner if it becomes cloudy, slimy or sour-smelling.

For a low-energy infusion, do not add sweeteners or consume the cinnamon stick. The more cinnamon material left in the drink, the less useful a general estimate for strained infused water becomes.

How many calories are in cinnamon water, and does it raise insulin?

There is no exact calorie figure for every glass of cinnamon water. The amount extracted can vary with the cinnamon stick, the amount of water and the steeping time. The general estimate for infused water is useful for context, but it should not be treated as proof that your drink contains zero calories.

Additions change the answer. Sugar, honey and other calorie-containing ingredients add energy, while consuming cinnamon particles rather than removing the stick adds material that a strained infusion would not contain. If you add anything, check whether your fasting plan allows it rather than assuming the drink still counts as plain water.

No study is available in the supplied evidence that directly measures the insulin response to cinnamon water during a fast. It is therefore not possible to say that cinnamon water leaves insulin unchanged, reliably lowers it or produces a particular fasting benefit.

Insulin responds to nutrients, but a drink’s effect cannot be determined from its colour or flavour. If controlling blood glucose is important to you, do not use cinnamon water as a substitute for your prescribed care or as a way to compensate for food.

Is cinnamon water allowed during intermittent fasting, a water fast or a fast for autophagy?

Flexible intermittent fasting

Some intermittent fasting plans focus on limiting energy during the fasting window rather than requiring plain water. Unsweetened, strained cinnamon water may fit that approach. Check the rules of your particular plan: there is no single calorie cutoff that makes a drink acceptable for every fasting method.

If your plan requires a strictly calorie-free window, you cannot assume a homemade cinnamon infusion qualifies. Choose according to the rule you are following, not a general claim that all infused waters are calorie-free.

Water-only fasting

A strict water-only fast means plain water, so cinnamon water is not part of it. Straining out the stick does not turn the infusion back into plain water; dissolved cinnamon substances remain.

If you have been told to fast for a blood test, procedure or other medical reason, follow the instructions from your care team. Do not substitute cinnamon water for the drinks they specifically permit.

Fasting for autophagy

Autophagy is a normal process in which cells recycle components, and nutrient availability can affect it. There is no direct evidence here showing whether a glass of cinnamon water changes autophagy during a human fast.

That uncertainty cuts both ways: you cannot assume cinnamon water stops autophagy, but you cannot claim it preserves or increases it either. For a strict protocol, follow its drink rules; for a flexible plan, recognise that the effect on autophagy is unknown.

Who should be careful?

People with diabetes, especially those taking insulin or other medicines that can lower blood sugar, should discuss fasting with a clinician. Children, pregnant or breastfeeding people, and anyone with a history of an eating disorder should also seek medical advice before fasting.

Large or frequent amounts of cassia cinnamon can be a concern because it contains coumarin, which can harm the liver. Keep cinnamon water lightly flavoured rather than using large amounts as a supplement. If fasting causes fainting, confusion or severe weakness, stop fasting and seek urgent medical care.