Most Germans don’t need electrolyte drinks during heatwaves

Experts say that while high temperatures increase sweat loss, the fluid is 98‑99 % water and contains at most about two percent electrolytes such as sodium, potassium, calcium and magnesium. Antje Gahl of the German Nutrition Society explains that the average diet already supplies sufficient minerals – sodium from bread, cheese and processed meats, potassium from fruit and vegetables, magnesium from whole grains, nuts and legumes. Consequently, most people do not need to replace electrolytes with specialised drinks, even during a heatwave.

Exceptions apply to athletes engaged in prolonged, intense exercise in the heat, such as marathon runners, who can lose up to ten liters of water and several grams of sodium and may benefit from an electrolyte solution. Over‑drinking without sodium replacement can cause hyponatraemia, a potentially serious condition. For everyday activities, adequate water and a varied diet remain the best hydration strategy.