It is a fascinating biological fact that we often take for granted: the human body is largely composed of water.
In fact, we are not just skin and bones, but a complex living system where water plays a central role in almost every function.
The Body as a “Water-Based System”
The human body relies heavily on hydration to function properly.
Approximate water composition in key parts of the body includes:
- About 70% of muscles
- About 90% of the brain
- A large portion of blood volume
- A significant part of bone structure (around 20%+)
These numbers highlight a simple truth: water is not optional—it is essential for life.
Why Water Is So Important
Water supports nearly every vital function, including:
- Brain activity and concentration
- Muscle movement and energy production
- Digestion and nutrient absorption
- Temperature regulation
- Waste elimination
Without proper hydration, the body becomes less efficient, both physically and mentally.
Starting the Day Dehydrated
After several hours of sleep, the body naturally wakes up in a slightly dehydrated state.
This happens because we do not drink water during the night, while the body continues to use fluids for basic functions.
That is why the first glass of water in the morning can feel especially refreshing.
Continue to the next page to discover why drinking water on an empty stomach is considered so beneficial →
