«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 and a research psychologist with the Military Nutrition Division, U.S. Army Research Institute
of Environmental Medicine in Natick, Mass. «In both sexes these adverse mood changes may limit the motivation required to engage in even moderate aerobic exercise.