As little as a one to three per cent decrease in your hydration can negatively affect your memory, concentration and decision-making. Water allows the chemicals and electrical signals to pass freely between brain cells. Try to drink at least 500ml of water for every 15 kg of your body weight each day. For the average man this would mean approximately three litres of water a day, or two and a half litres if you are a woman. Exercising or drinking caffeinated drinks will have a dehydrating effect, so in this case, you’ll need to drink more water than this to make up for it.

Eating hydrating foods, such as cucumber, melon and lettuce can actually be even more beneficial than water. Our bodies can often retain more water from foods rather than from drinks so they can be more effective at keeping our brains properly hydrated.

Other Information and Advice

Drinking water boosts your brain's reaction time

Drinking water boosts your brain's reaction time

Research has revealed that drinking water boosts our brain's performance in mental tests.

National Hydration Council

National Hydration Council

Organisation dedicated to researching and communicating facts about healthy hydration.

Why Your Brain Needs Water

Why Your Brain Needs Water

Water enhances mental function and is essential to survival.

How drinking a glass of water can make your brain 14% faster

How drinking a glass of water can make your brain 14% faster

Drinking could be freeing up parts of the brain 'telling' the body it is thirsty, researchers say

Dehydration and Its Effects on Brain Health and Function

Dehydration and Its Effects on Brain Health and Function

The average human body is 60 percent water. Your body uses water to perform a multitude of functions.....