Wendie Trubow, MD, MBA, IFMCPPresident at Five Journeys, Functional Medicine & Wellness Provider, Best Selling Author, Passionate Champion for Health

How Water Only Fasting May Cause Dehydration

23 Feb 2026 · 0 min

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0:25

Dr. Wendie Trubow explains why water-only fasting can cause dehydration: without electrolytes, your body can't retain water properly, and people often stop drinking when they stop eating. The result is fluid loss even though you're drinking water.

Some interesting ones that always surprise me, like dehydration. Who would have thought that water only fasting would be potentially dehydrating? But it is because you don't get any electrolytes with your, with your hydration, so it can be harder to absorb as much of it. And two people, when they stop eating, oftentimes stop drinking. It's just a psychological like I don't need anything type thing.

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