Is Your Brain Dehydrated? Here's How to Tell Do you ever feel mentally sluggish, forgetful, or irritable? Your brain might be dehydrated—literally shrinking due to a lack of water. Hydration is essential for optimal brain function, yet many people unknowingly suffer from dehydration, leading to brain fog, fatigue, headaches, and trouble focusing. Even your mindset and mood can shift drastically when your body and brain aren't properly hydrated, impacting daily performance . Water makes up about 75% of the brain, and staying mentally sharp requires hydration just as much as brain training exercises , fueling critical processes like memory, concentration, and neurotransmitter activity. Even mild dehydration—losing just 1-2% of body water—can interrupt cellular activity, especially in tissues that rely on hydration for regulation and insulation . Despite these consequences, many don’t realize that dehydration could be the root cause of their mental sluggishness. ...
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