Q: How much water do we really need — and can you drink too much?
A: Water is essential for life, but like many things, balance matters. Most healthy adults need roughly 6 to 8 cups of water a day, though the exact amount depends on activity level, climate and individual health. A simple rule of thumb is to drink when you’re thirsty and pay attention to your urine color, which should be pale yellow.
It is possible to drink too much water. Consuming large amounts in a short period can dilute the sodium in your blood, a condition called hyponatremia. This can cause symptoms like nausea, headache, confusion and, in severe cases, seizures. Endurance athletes, those on certain medications and anyone rapidly consuming extreme amounts of water are at greater risk, however it is uncommon for the average person to overhydrate.
People with certain kidney, liver or heart conditions may have more trouble getting rid of extra water, which can build up in their bodies and make them short of breath. They may require medication to help them urinate more frequently.
Most of us stay safely within our hydration needs without thinking about it. Water from foods like fruits, vegetables and even soups contributes to daily intake, and other beverages like tea or milk also count. Spreading water intake evenly throughout the day, rather than drinking very large amounts at once, helps your body manage hydration safely.
Certain situations may require more attention. Breastfeeding, hot weather, vigorous activity and illness with fever, diarrhea or vomiting all increase fluid needs. Older adults may also need reminders to drink regularly because the sensation of thirst can diminish with age.
Hydration is important, but more is not always better. Listen to your body, let thirst and pale-yellow urine guide you, and adjust for your lifestyle. If you are unsure about your fluid needs or you have a medical condition affecting your kidneys, heart, liver or electrolytes, consult your doctor for personalized guidance.
Dr. Jessica Tyler is a board-certified internal medicine physician at CommonSpirit Medical Group – Primary Care – Glenwood and is a member of the Chattanooga-Hamilton County Medical Society.