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If you’re struggling to come up with the answers, then a glass of water could be the best solution.
Drinking water can sharpen your mind, research shows. The effect is particularly marked if a person is thirsty.
The University of East London researchers believe that once thirst is relieved, the brain is left to focus on the task in hand.
They carried out an experiment on 34 men and women who completed a number of mental tests twice – once after a breakfast of just a cereal bar and again after a cereal bar washed down with a bottle of water.