Deuterium-Depleted Water and Fasting: Does It Break a Fast? | Yavelle

A Yavelle 25ppm deuterium-depleted water bottle on a white marble surface in soft morning light, beside an empty bowl representing an intermittent fasting window.

Yavelle Journal · Fasting · 4 min read

Fasting What is DDW FAQ
People who fast ask us one question more than any other: does deuterium-depleted water break a fast? What we can tell you is what is in the bottle. DDW is water. It contains no calories, no sugar and nothing to digest, so nutritionally it is the same proposition as any other glass of water. What that means for your fast is a question for you and your practitioner.

That is genuinely the whole of what we can tell you, but it is worth setting out plainly what DDW is, what it is not, and why we are not going to tell you how to fast.

What Is Actually in the Bottle

DDW contains no calories, no sugar, no protein and nothing your body needs to digest. It is water with less of one naturally occurring isotope, and nothing is added. Nutritionally it is the same as plain water.

So if your fasting routine allows water, deuterium-depleted water is nutritionally the same proposition. There is nothing in the bottle that changes that.

What DDW Is

Deuterium-depleted water is ordinary water in which the proportion of deuterium, a naturally occurring heavier isotope of hydrogen, has been reduced. Typical drinking water sits at around 150 parts per million of deuterium. Yavelle DDW is produced to a 25ppm specification, and every batch is tested against it. Nothing is added and nothing else is changed.

If you would like the detail on how that is done and why the number is verified batch by batch, our article on how deuterium-depleted water is made covers it.

What We Are Not Going to Tell You

We are a water company, not a clinic, and fasting is a bigger decision than which water you put in the glass. How long to fast, how often, whether to fast at all, how much to drink, and what to do about electrolytes are all questions that depend on you — your health, your medications, your circumstances — and they belong with a qualified health practitioner rather than with us.

If you are pregnant or breastfeeding, underweight, or managing a medical condition or treatment, please talk to a healthcare professional before fasting.

The bottom line Deuterium-depleted water contains no calories and nothing to digest, so nutritionally it is the same proposition as plain tap water. Everything else about how you fast is a conversation for you and your health practitioner.

Where to Go Next

Our article on how deuterium-depleted water is made explains the production and testing side, and the low deuterium food list covers the deuterium content of common foods.

Further reading

  1. Goncharuk, V. V., Kavitskaya, A. A., Romanyukina, I. Y., & Loboda, O. A. (2013). Revealing water's secrets: deuterium depleted water. Chemistry Central Journal, 7(1), 103. https://doi.org/10.1186/1752-153X-7-103 PMC3703265

This article is for educational purposes and answers a common general question about deuterium-depleted water. It does not constitute medical, dietary or fasting advice, makes no therapeutic claims, and is not a substitute for guidance from a qualified healthcare provider.

Yavelle 25ppm Deuterium-Depleted Water is a packaged food. It is not a therapeutic good and is not intended to diagnose, treat, cure or prevent any disease. Information on this page is general and is not medical advice. If you have a health condition or are undergoing treatment, speak with a qualified health practitioner.