It should be emphasized that not thirsty means that there is no shortage of water in the body. Lack of water in the body is not only thirst, but also burnout and fatigue. If you are not thirsty, you need to replenish water. But the water supplement should not be too much, not more than 2500ml.
Water is an indispensable condition for human survival and a necessary solvent for cells to carry out various biochemical reactions in the body. Normal people's daily water intake and discharge will maintain a dynamic balance. The water loss of human body from urine, sweat or skin evaporation every day is about 1800-2000ml, so healthy adults need to supplement 2000-2500ml of water every day.
The renal function of the elderly will deteriorate to a certain extent, and excessive drinking water may overload the kidneys, resulting in edema and hypertension. For people with nephrotic syndrome and heart failure, drinking more water will increase the burden on the kidneys, resulting in water not being excreted and aggravating the condition. Therefore, the elderly and people with basic diseases need to drink less water.