If you’re feeling parched, if your mouth feels dry, your body has likely lost 1 to 2 percent of its water content already. That’s a late indicator of dehydration, particularly in older adults.
Idea for Impact: Amid the current record-breaking heat wave, don’t wait for thirst to set in. Monitor for early clues from your body telling you it needs fluids—darker-colored urine, reduced exercise performance, headache, exhaustion, wooziness, and hunger.