# Your Brain Is Starving, and It's Not for Food

Page: https://stenobird.com/podcast/dr-joseph-mercola-take-control-of-your-health-402388/your-brain-is-starving-and-it-s-not-for-food
Text version: https://stenobird.com/podcast/dr-joseph-mercola-take-control-of-your-health-402388/your-brain-is-starving-and-it-s-not-for-food.md
Podcast: [Dr. Joseph Mercola - Take Control of Your Health](https://stenobird.com/podcast/dr-joseph-mercola-take-control-of-your-health-402388)
Published: 2026-07-22T04:00:00+00:00
Episode link: https://mercola.libsyn.com/your-brain-is-starving-and-its-not-for-food
Audio file: https://traffic.libsyn.com/secure/mercola/7.21_Lead_Your_Brain_Is_Starving_and_Its_Not_for_Food.mp3?dest-id=574508
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Duration seconds: 418

## Resource

Your brain is about 75% water, and even mild dehydration slows focus, memory, reaction time, and mental clarity long before intense thirst appears Researchers found that 56% of older adults in a two-year cognitive study were physiologically dehydrated, even though most consumed what guidelines considered enough water Dehydration interferes with blood flow, oxygen delivery, and communication between brain cells, which contributes to brain fog, fatigue, irritability, and slower thinking Drinking excessive amounts of plain water creates its own problems by diluting sodium and disrupting electrolyte balance, which lowers cellular energy production and worsens dehydration at the cellular level Consistent hydration throughout the day, along with mineral-rich fluids, whole fruits, and electrolyte support during heavy sweating, helps your brain maintain sharper focus, steadier energy, and better long-term cognitive health

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