While most understand that dehydration can have medical complications, a new study shows that even mild dehydration can influence mood, energy levels and the ability to think clearly.
Regrettably, we often use thirst as an indicator for when we need to drink — a response that experts say is too late to avoid many of the detrimental effects of dehydration.
In two recent studies, researchers at the University of Connecticut’s Human Performance Laboratory discovered the mental, mood and cognitive downside of even mild dehydration.
Investigators determined that it didn’t matter if a person had just walked for 40 minutes on a treadmill or was sitting at rest – the adverse effects from mild dehydration were the same.
Mild dehydration is defined as an approximately 1.5 percent loss in normal water volume in the body.
The take home message is that individuals need to stay hydrated at all times, not just during exercise, extreme heat or exertion.
“Our thirst sensation doesn’t really appear until we are 1 [percent] or 2 percent dehydrated. By then dehydration is already setting in and starting to impact how our mind and body perform,” says Lawrence E. Armstrong, one of the studies’ lead scientists and an international expert on hydration.
The importance for everyone to stay hydrated is a message that needs to be promoted.
“Dehydration affects all people, and staying properly hydrated is just as important for those who work all day at a computer as it is for marathon runners, who can lose up to 8 percent of their body weight as water when they compete.”
In the study, separate groups of young women and men were tested. Twenty-five women with an average age of 23 took part in one study. The men’s group consisted of 26 men with an average age of 20.
All of the participants were healthy, active individuals, who were neither high-performance athletes nor sedentary — typically exercising for 30 to 60 minutes per day.
Each participant took part in three evaluations that were separated by 28 days. All of the participants walked on a treadmill to induce dehydration, and all of the subjects were hydrated the evening before the evaluations commenced.
As part of the evaluation, the subjects were put through a battery of cognitive tests that measured vigilance, concentration, reaction time, learning, memory, and reasoning. The results were compared against a separate series of tests when the individuals were not dehydrated.
The young women experienced mild dehydration which caused headaches, fatigue, and difficulty concentrating. They also perceived tasks as more difficult when slightly dehydrated, although there was no substantive reduction in their cognitive abilities.
The research findings are published in The Journal of Nutrition.
In the tests involving the young men, mild dehydration caused some difficulty with mental tasks, particularly in the areas of vigilance and working memory, according to the results of the second UConn study.
While the young men also experienced fatigue, tension, and anxiety when mildly dehydrated, adverse changes in mood and symptoms were “substantially greater in females than in males, both at rest and during exercise,” according to the study. The men’s study was published in the British Journal of Nutrition.
“Even mild dehydration that can occur during the course of our ordinary daily activities can degrade how we are feeling – especially for women, who appear to be more susceptible to the adverse effects of low levels of dehydration than men,” says Harris Lieberman, one of the studies’ co-authors.
“In both sexes these adverse mood changes may limit the motivation required to engage in even moderate aerobic exercise. Mild dehydration may also interfere with other daily activities, even when there is no physical demand component present.”
Investigators are uncertain why women and men are so adversely affected by mild dehydration. One possibility is that neurons in the brain detect dehydration. These neurons may then signal parts of the brain regulating mood.
This process could be part of an ancient warning system protecting humans from more dire consequences, and alerting them to the need for water to survive.
In order to stay properly hydrated, experts like Armstrong recommend that individuals drink eight, 8-ounce glasses of water a day, which is approximately equivalent to about 2 liters of water.
People can check their hydration status by monitoring the color of their urine. Urine should be a very pale yellow in individuals who are properly hydrated.
Urine that is dark yellow or tan in color indicates greater dehydration. Proper hydration is particularly important for high-risk groups, such as the elderly, people with diabetes, and children.
Source: University of Connecticut