Author
BetterProduct Editorial Team
Water makes up about 60% of your body weight and is involved in virtually every bodily function — from regulating temperature and transporting nutrients to lubricating joints and flushing waste. Even mild dehydration (1–2% of body weight) can impair cognitive performance, mood, and physical endurance. Yet many people are chronically mildly dehydrated without realizing it.
BetterProduct Editorial Team
Checked against public health guidance and standard screening formulas. Not a diagnosis.
March 2026
Educational estimates and everyday wellness planning.
7 language editions aligned from the same source formulas.
The National Academies recommends about 3.7 liters (125 oz) per day for men and 2.7 liters (91 oz) for women from all sources (beverages and food). A simpler guideline: drink 30–35 ml per kilogram of body weight. A 70 kg (154 lb) person needs about 2.1–2.5 liters of water daily. Active people, those in hot climates, and pregnant or breastfeeding women need more.
Mild dehydration symptoms include thirst, dark yellow urine, dry mouth, fatigue, and headache. Moderate dehydration causes dizziness, reduced urine output, and muscle cramps. Severe dehydration is a medical emergency. The simplest hydration check: your urine should be pale yellow. Dark yellow or amber means you need more water; colorless may mean you're overhydrated.
All beverages contribute to hydration, including coffee and tea (despite being mild diuretics, they still provide net hydration). About 20% of daily water intake comes from food — fruits and vegetables have high water content (cucumbers, watermelon, and lettuce are 90%+ water). Sports drinks are only necessary for exercise lasting more than 60–90 minutes.
Carry a reusable water bottle and refill it throughout the day. Drink a glass of water first thing in the morning and before each meal. Set reminders on your phone if you forget to drink. Flavor water with lemon, cucumber, or mint if plain water is unappealing. Eat more water-rich fruits and vegetables.