Drink with context, not superstition
Hydration and electrolytes
Learn what total water means, measure exercise losses, plan for heat, decide when sports drinks earn their place, and avoid the real danger of drinking far beyond your needs.
How much water per day?
Understand total water, food moisture, broad reference intakes, and individual variation.
MeasureMeasure your sweat rate
Run a controlled field test and avoid turning one result into a permanent prescription.
Heat safetyHydration in hot weather
Combine water with cooling, pacing, acclimatization, and symptom awareness.
ElectrolytesWhen do electrolytes matter?
Choose water, food, a sports drink, or clinical guidance based on the actual job.
SafetyOverhydration and hyponatremia
Learn why forced drinking and finishing heavier can become dangerous.
SignalsUrine color and thirst
Use simple clues without mistaking them for a diagnosis.
Myth checkDoes caffeine dehydrate you?
Separate ordinary coffee from high-dose energy products and heat decisions.
CompareSports drinks vs. water
Compare duration, carbohydrate, sodium, calories, and convenience.
FoundationsElectrolytes explained
Understand sodium, potassium, fluid balance, nerves, and muscle function.
PerformanceHydration and performance
See how losses, conditions, and event duration change the performance question.
Healthy agingHydration for older adults
Account for thirst changes, access, mobility, medicines, and clinical boundaries.
Myth checkBeyond eight glasses
Replace a universal slogan with a flexible daily framework.