Summer Hydration Guidelines Recommend Up to 4 L Water Daily for Adults

Health experts from bodies such as the European Food Safety Authority and the U.S. National Academy of Sciences advise a baseline fluid intake of about 2 L per day for women and 2.5‑3 L for men. On days when temperatures exceed 30 °C, they suggest increasing consumption to roughly 2.5‑3 L for women and 3.5‑4 L for men, adding an extra 0.5‑1 L for each hour spent in the heat or engaged in physical activity.

Dehydration can be monitored by checking urine colour, noting weight loss of 1‑2 kg from morning to evening, observing an elevated pulse, or performing a skin‑pinch test. Athletes and outdoor workers should sip water regularly (200‑300 ml every 30‑45 minutes) and consider electrolyte‑rich drinks. Alcohol, certain fruits like mango, and heavy protein meals are discouraged during extreme heat.