4. Your mood, memory, and concentration will improve.
The amount of water in our bodies significantly affects our brains. Even mild dehydration, like drinking less than half the amount of water you need daily, can make some parts of the brain work less well.
A study found that a fluid loss of 1.4% in women can affect their ability to focus and mood. It can also make them have headaches more often. On the other hand, men can lose their memory and feel tired and anxious if they lose 1.6% of their body fluids.