Your Brain Runs on Water: Why Hydration Matters More Than You Think
05 October 2025
Here’s a fact worth thinking: your brain is about 75% water. It’s not just your body that needs regular hydration, but your mind depends on it too. From focus to mood to energy levels, water plays a vital role in keeping your brain firing on all cylinders. Yet many of us still underestimate its simple power.
🧠Hydration and focus
Even mild dehydration, as little as 1–2% loss of body water, can affect your ability to concentrate and remember things. That’s because water supports the flow of nutrients and oxygen to the brain, helping your neural pathways stay sharp. A steady intake of fluids is like fuel for clearer thinking.
😊Hydration and mood
Water doesn’t just refresh the body; it influences how you feel. Even mild dehydration can raise cortisol, the stress hormone, by around 28% in athletes compared to well-hydrated peers ( Frontiers in Physiology). Other research shows that for every 1% drop in body weight from fluid loss, cortisol levels rise measurably ( MDPI). In practice, this means drinking enough water can help reduce irritability and support a more positive mood. When your body is balanced, your mind follows suit
⚡Hydration and energy
We often associate fatigue with lack of sleep or too much work, but dehydration is one of the most common culprits behind low energy. That’s because water is essential for oxygen circulation in the brain. Staying hydrated ensures that oxygen reaches where it’s needed most, helping you stay alert and energised throughout the day.
🌊Making hydration easy (and impactful)
We know it’s not always simple to keep on top of hydration. That’s why we created the Bottle + Hydration Bundle: your Ocean Bottle paired with Spruce’s natural, sugar-free sachets. The sachets are packed with electrolytes and essential vitamins to make hydration both effortless and enjoyable, wherever your day takes you.
And as with everything we do, your choice has impact. Every bundle funds the collection of 1,000 ocean-bound plastic bottles. So while you’re looking after your mind and body, you’re also helping to protect our oceans.
Hydration isn’t just about drinking more water. It’s about giving your brain what it needs to thrive, and making small, intentional choices that ripple out into something bigger.
