Significance of fluid intake for (mental) performance

(...) This is connected with a reduced capacity for work, an increase in errors and an increased risk of accidents.
Temporary fluid deficits influence mental function and your subjective sense of well-being. In particular, reductions in fluid intake have adverse effects on short-term memory.
Thus it is important to maintain an overall daily water equilibrium as well as to prevent temporary fluid deficits to maintain your maximum mental capabilities.

Condition 03/01, Dipl. oec. Troph. Uwe Schroeder, Institut für Sporternährung e.V., Bad Nauheim