How much water do I need every day?

Are you getting enough water?
Are you getting enough water?
Digital Vision/Getty Images

Because water has so many life-sustaining functions, dehydration isn't just a matter of being a little thirsty. The effects depend on the degree of dehydration, but a water shortage causes your kidneys to conserve water, which in turn can affect other body systems. You'll urinate less and can become constipated. As you become increasingly more dehydrated, the following symptoms will develop:

  • diminished muscular endurance
  • dizziness
  • lack of energy
  • decreased concentration
  • drowsiness
  • irritability
  • headache
  • tachycardia (galloping heart rate)
  • increased body temperature
  • collapse
  • permanent organ damage or death

Obviously, you don't want to develop the problems listed above, so you have to ask: How much water do I need each day?


Under normal conditions, the standard of 64 ounces a day is sufficient. That amount includes water from sources other than the tap. If you're an athlete or someone who spends a lot of time out in the sun, sweating, you'll probably need more. A good way to tell if you're adequately hydrated is by observing the color of your urine. If it's dark yellow or amber, that's a sign that it's concentrated, meaning there's not enough water in the wastes that are being eliminated. If it's light, the color of lemon juice, that's normal. Bathroom breaks should happen every two to three hours. If you don't need to urinate for longer periods of time, you're not drinking enough water.

For more health tips, see the links on the next page.


Lots More Information

Related Articles


Timothy Gower is a freelance writer and editor whose work has appeared in many publications, including Reader's Digest, Prevention, Men's Health, Better Homes and Gardens, The New York Times, and The Los Angeles Times. The author of four books, Gower is also a contributing editor for Health magazine.

Alice Lesch Kelly is a health writer based in Boston. Her work has been published in magazines such as Shape, Fit Pregnancy, Woman's Day, Reader's Digest, Eating Well, and Health. She is the co-author of three books on women's health.

Linnea Lundgren has more than 12 years experience researching, writing, and editing for newspapers and magazines. She is the author of four books, including Living Well With Allergies.

Michele Price Mann is a freelance writer who has written for such publications as Weight Watchers and Southern Living magazines. Formerly assistant health and fitness editor at Cooking Light magazine, her professional passion is learning and writing about health.


Ivan Oransky, M.D., is the deputy editor of The Scientist. He is author or co-author of four books, including The Common Symptom Answer Guide, and has written for publications including the Boston Globe, The Lancet, and USA Today. He holds appointments as a clinical assistant professor of medicine and as adjunct professor of journalism at New York University.