Our bodies are around 60% water, give or take.
It is commonly recommended to drink eight 8-ounce glasses of water per day (the 8×8 rule).
Although there is little science behind this specific rule, staying hydrated is important.
Here are evidence-based health benefits of drinking plenty of water.
Water Helps to Maximize Physical Performance
Dehydration can have a noticeable effect if you lose as little as 2% of your body’s water content. However, it is not uncommon for athletes to lose up to 6-10% of their water weight via sweat.
This can lead to altered body temperature control, reduced motivation, increased fatigue and make exercisefeel much more difficult, both physically and mentally.
Optimal hydration has been shown to prevent this from happening, and may even reduce the oxidative stress that occurs during high intensity exercise. This is not surprising when you consider that muscle is about 80% water.
Hydration Has a Major Effect on Energy Levels and Brain Function
Your brain is strongly influenced by hydration status.
Studies show that even mild dehydration (1-3% of body weight) can impair many aspects of brain function.