Drink more WATER

Humans can survive for several weeks without food, but for only a few days without water. A constant supply is needed to replenish the fluids lost through normal physiological activities, such as respiration, sweating and urination.Reference daily intake for water is 3.7 L/day for human males aged 19-30 years. Food contributes 0.5–1 L, and the metabolism of protein, fat, and carbohydrates produces another 0.25–0.4 L^[3]. Thus, a person needs to drink approximately 2–3 L of water per day. These assumptions are limited by the condition of the subject, including personal health and physical exercise, but are also affected by temperature and humidity. For a long term functional urinary tract, about 1–2 L have to be produced per day (300-400 mL/urination, ~4 urinations/day), and the according intake has to be sustained, depending on the environmental conditions.