Quick answer
Sodium is essential for fluid balance. Too little salt with too much water causes hyponatremia. Athletes and those in hot climates need strategic salt intake for proper hydration.
Key takeaways
- Sodium is essential for fluid balance. Too little salt with too much water causes hyponatremia. Athletes and those in hot climates need strategic salt intake for proper hydration.
- Drinking large volumes of plain water during endurance events without replacing sodium can dilute blood sodium to dangerous levels.
- The WHO recommends limiting sodium to under 2 g per day (about 5 g salt) for most adults.
Sodium is essential for fluid balance. Too little salt with too much water causes hyponatremia. Athletes and those in hot climates need strategic salt intake for proper hydration.
Sodium's Role in Hydration
Sodium is essential for fluid balance. Too little salt with too much water causes hyponatremia. Athletes and those in hot climates need strategic salt intake for proper hydration. Sodium helps hold water in the right compartments inside and outside cells.
Hyponatremia Risk
Drinking large volumes of plain water during endurance events without replacing sodium can dilute blood sodium to dangerous levels. Symptoms include headache, nausea, confusion, and in severe cases seizures. Electrolyte drinks or salty foods during long efforts reduce this risk.
Daily Sodium Balance
The WHO recommends limiting sodium to under 2 g per day (about 5 g salt) for most adults. Sedentary people often meet needs through food alone. Heavy sweaters may need more on training days. Consult a clinician if you have heart, liver, or kidney conditions.
Practical Hydration Tips
Drink to thirst during daily life. During exercise over one hour in heat, include electrolytes. Eat fruits and vegetables for potassium. Monitor urine color as a rough hydration guide. Pale yellow usually means adequate fluids.