Dehydration

Dehydration occurs when your body loses more fluid than it takes in, creating a deficit that disrupts normal bodily functions. Even mild dehydration of just 1-2% body weight loss can impair cognitive performance, reduce physical endurance, and trigger headaches. The human body is roughly 60% water, and every system depends on adequate hydration to function properly. Common causes include insufficient water intake, excessive sweating during exercise or hot weather, illness involving vomiting or diarrhea, and certain medications like diuretics. Early warning signs include dark yellow urine, dry mouth, fatigue, and dizziness. Chronic dehydration, often overlooked, has been linked to kidney stones, urinary tract infections, and even impaired mood. Children and older adults are especially vulnerable because children have higher metabolic rates relative to body size, and seniors often have a diminished thirst sensation. To prevent dehydration, use our calculator to determine your personal daily water target and sip consistently throughout the day rather than waiting until you feel thirsty.