1) It improves concentration
Because your brain is made of around 85% water if you get dehydrated it can affect your concentration and even your short-term memory. It has a particularly strong effect on your maths skills and it's all because lack of water causes your brain's energy levels to decrease.
2) It boosts your energy
In the same way that not drinking enough water makes your brain slow down it has the same effect on your body. For example, your muscles are around 75% water, your bones are about 22% and your blood is around 83%. If you're dehydrated, all these body parts don't work as well as they should meaning you lack energy and feel tired or lazy.
3) It supports your heart
The hardest working muscle of all needs a lot of water to keep it going at full speed. When you get dehydrated your blood gets thicker so the heart has to work even harder. And if your heart is weak it can lead to more serious heart problems later in life. A study found that drinking more than five glasses of water a day could cut your chances of having a heart attack by 41%, compared with people who drank less than two glasses a day.
4) Water stops headaches and dizziness
Don't reach for the pills straight away, your headache could be a symptom of being dehydrated so drinking water should make it go away. Even tension headaches and dizziness, which can be brought on by fatigue can be cured or helped by drinking water - this is because fatigue is also a sign of dehydration.
5) Water clears your skin
Most people know that drinking more water can be good for clear skin and it can also help the symptoms of acne. If you've got dry skin, drinking water will give it more moisture but that's not all. Water flushes toxins out of your body and anything else that shouldn't be there so it clears your skin of any dirt and bacteria.