Myth: You Should Always Drink Eight Glasses of Water a Day

The myth that you must drink exactly eight glasses (about two liters) of water every day is a widespread belief. People are often told to drink more water, regardless of their individual needs or circumstances.

The "eight glasses a day" rule is a rough guideline, not a one-size-fits-all recommendation. Individual water needs vary depending on factors such as age, sex, weight, physical activity level, climate, and overall health. The Institute of Medicine suggests that women should aim for about 2.7 liters (91 ounces) of total water intake per day, while men need about 3.7 liters (125 ounces). This includes water from all sources, not just plain water, and includes fluids from foods like fruits and vegetables. The best way to stay hydrated is to listen to your body's thirst cues and adjust your water intake accordingly.