The general recommendation is 8 glasses (64 oz / 2 liters), but individual needs vary based on weight, activity level, climate, and health status. A better formula: drink half your body weight in ounces.
Yes. Overhydration (hyponatremia) occurs when you drink so much water that sodium levels become dangerously diluted. Symptoms include nausea, headache, and confusion. Stick to recommended amounts.
Yes, though caffeine is a mild diuretic. Research shows moderate coffee consumption (3-4 cups/day) still contributes to hydration. Water remains the best choice.
Signs include dark yellow urine, thirst, dry mouth, fatigue, dizziness, and headache. By the time you feel thirsty, you're already mildly dehydrated.
Yes. Add 16-20 oz of water 2 hours before exercise, 8 oz every 15-20 minutes during, and 16-24 oz per pound of body weight lost after.
Cucumbers (96%), lettuce (96%), celery (95%), watermelon (92%), strawberries (91%), and tomatoes (94%) all contribute to hydration.