• Age: Kids need plenty of fluids; they can get dehydrated much more easily than adults. Older people may need more fluids because of health conditions or because they tend to lose their sense of thirst.
• Gender: Men need more fluids than women. (And pregnant women need more fluids than other women.)
• Weight: Heavier people need more water.
• Health: Conditions such as diabetes, cystic fibrosis, and kidney disease can boost your need for fluids.
• Environment: You need more fluids in extreme weather conditions (especially hot, humid, or cold) and at high altitudes.
