Water makes up at least two-thirds of the human body and plays an important role in your normal functions. Subsequently, dehydration can lead to a number of other ailments, from
migraines1 and
constipation to
kidney stones. It can also take a toll on your brain health, affecting your mood and overall brain function. For example, when you're dehydrated, you're more prone to irritability, anxiety and fatigue.
Dehydration happens when you've lost too much water in your body without replacing it, preventing your body from performing its normal functions. Mild dehydration can easily be treated but if it reaches extreme levels, it can be life-threatening and will require immediate medical attention.
Dehydration Shrinks Your BrainAbout three-quarters of your brain is water, and when dehydrated, your brain actually shrinks in volume. (This shrinking is what causes a dehydration headache.)
Even mild or temporary dehydration can alter your brain function and impact your mood
2 as revealed in a 2013 study,
3 in which 20 healthy women in their mid-20s were deprived of all beverages for 24 hours. While no clinical abnormalities were observed in the biological parameters (urine, blood and saliva), thirst and heart rate did increase and urine output was drastically reduced. As expected, the urine also became darker. As for mood effects, the authors noted:
"The significant effects of [fluid deprivation] on mood included decreased alertness and increased sleepiness, fatigue and confusion. The most consistent effects of mild dehydration on mood are on sleep/wake parameters..."
Comment: And not only in California: STD infections have become a major health problem worldwide as antibiotics fail