Staying properly hydrated enables the brain to stay alert so we can keep our attention and focus. ... Drinking water increases the brain's temperature and gets rid of toxins and dead cells. It also keeps cells active and balances chemical processes in the brain, helping to regulate stress and anxiety.

What does lack of water do to the brain?

Therefore, if water levels are too low, our brain cells cannot function properly, leading to cognitive problems. The brains of dehydrated adults show signs of increased neuronal activation when performing cognitively engaging tasks, indicating that their brains are working harder than normal to complete the task [1].

Does drinking water improve brain function?

Water helps your brain cells communicate with each other, clears out toxins and waste that impairs brain function, and carries nutrients to your brain. This all falls apart if your fluid levels drop. Staying hydrated has been linked to: Faster decision making and improved performance on cognitive tests.