Whether you exercise or not you probably know that you should drink when you’re thirsty in order to perform well. You’ve also likely experienced the effects of dehydration at some point.
That splitting headache? That’s caused by your brain shrinking when it doesn’t get enough water.
As odd as that may sound, many studies over the years have proved this.”
A team from the Centre for Neuroimaging Sciences, Institute of Psychiatry, King's College London found that our brains don’t work as well after “prolonged states of reduced water intake”. And by that, they were referring to just 90 minutes of sweating without taking in water. They also found that, on average, their subjects’ brains shrank the equivalent of fourteen months of ageing, the same amount as seen after ten weeks of Alzheimer’s.
Considering that our brains are 80% water, it’s not surprising that they would shrink when the body is dehydrated. But shrinkage and a blinding headache are not the only effects of dehydration on the brain.