Mykola Iabluchanskyi: How Much Water Does Your Brain Really Need?
Mykola Iabluchanskyi, Consultant Professor at School of Medicine, V. N. Karazin Kharkiv National University, shared a post on LinkedIn:
“How Much Water Do You Need to Keep Your Brain Sharp?
August 28, 2026
Have you ever felt mentally slow on a hot afternoon – unable to focus, slightly irritable, and surprised by how hard it is to do simple work? Lack of sleep, stress, illness, and hunger can all cause this ‘brain fog.’
But so can something much simpler: not drinking enough.
Water is not a magic brain tonic. Drinking extra water will not turn an already well-hydrated person into a genius, prevent dementia, or compensate for poor sleep.
But dehydration can make the brain work less comfortably and, in some circumstances, less effectively.
Studies suggest that when people lose body water – particularly through heat, sweating, illness, or prolonged under-drinking – they may experience more fatigue, headache, poorer mood, reduced alertness, and difficulty with attention or working memory.
The effects are most consistent when dehydration becomes moderate or when heat stress is added.
So, how much should you drink?
The most honest answer is: enough to replace what your body loses, adjusted for your age, health, food intake, activity, and environment.
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