Heat wave health risks and hydration guidance for seniors and the public

Extreme summer temperatures raise the risk of heat‑related illnesses, especially in older adults and people with chronic conditions. Early signs of heat stroke in seniors can be subtle, such as sudden fatigue, confusion, loss of appetite or mild fever, and should prompt immediate cooling and medical attention. Cardiologists warn that prolonged heat above 35 °C can trigger heart attacks, arrhythmias and worsen vascular disease, making adequate hydration and avoidance of peak‑heat hours essential.

Health experts advise drinking at least 1.5 L of fluid daily, preferring plain water but also recommending naturally flavored water (e.g., lemon, orange, cucumber) and cold water for comfort in intense heat. Caution is urged against excessive caffeine, alcohol, sugary drinks and energy drinks, which can increase dehydration. For seniors, a simple lemon‑water drink may encourage more fluid intake and provide vitamin C and citric acid, which can help prevent kidney stones.

Nutrition guidance suggests light, water‑rich foods—fresh salads, seasonal fruits, tomatoes, cucumbers, gazpacho, yogurt and lean fish—to support hydration and reduce digestive strain. Diuretics and blood‑pressure medications may need dose adjustments under medical supervision during heat waves. Maintaining a cool indoor environment (24‑26 °C), staying out of direct sun between 12 pm and 8 pm, and monitoring vulnerable individuals are critical to prevent severe outcomes.