Why Is Drinking Water Important? 6 Reasons to Stay Hydrated

One item I could not live without? My water bottle. In fact, to make sure that I have one with me at all times, I own several; I keep one in my car, purse, and backpack, so I have one on hand pretty much everywhere I go. I also keep a reusable cup with a lid and straw next to me all day long, so I can easily sip throughout the day.

Do you drink enough water each day? If not, your overall health may be taking a toll. So why is drinking water important? Drinking water regularly can help you to lose weight, think better, be in a better mood, prevent disease, and more.

Why Does the Body Need Water?

Water makes up about 60 percent of our body weight and is vital for almost every function in the body. It acts as a building block, a solvent for chemical reactions, and a transport material for nutrients and waste. It helps maintain blood volume and allows proper circulation, helps regulate our body temperature, acts as a shock absorber for our joints and our brain, helps lubricate the linings of our inner organs, maintains healthy kidney function, and more.[1,2]


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Drinking plenty of water can help keep your body healthy and functioning at its highest capacity. Staying hydrated will help you to:

  1. Improve physical performance. During physical activity, our bodies use up a lot of water. Staying hydrated before, during, and after exercise helps to protect your body from harm, and it also helps you to perform better. Proper hydration can reduce fatigue, improve endurance, lower your maximum heart rate, and more. It can also help you to be less sore after exercise.[1,3,4]
  2. Help you to lose weight. Are you having trouble with your weight loss efforts? Increasing your water intake may help you achieve better results. Studies show that people who are on diets lose more weight when they also increase their water intake.[5,6] In one study, people on weight loss diets who drank 500 ml of water before each of their three daily meals for 12 weeks lost 4.6 more pounds on average than people who did not drink the additional water.[5]
  3. Boost your mood. People who drink more water also tend to have better moods. One study found that when people who regularly drank less than 1.2 liters of water per day increased their intake to 2.5 liters per day, the participants experienced significantly less confusion, bewilderment, fatigue, and sleepiness. On the other hand, for people who regularly drank two to four liters of water per day who were then restricted to one liter per day, the reduced water intake led negative effects on mood, including decreased contentedness, calmness, and positive emotions.[7]
  4. Boost your brainpower. Drinking more water may improve your cognitive performance, too. Several studies have shown that people drinking water during cognitive tasks performed much better than those people who did not drink water during the tasks. These results have been found in both adults and children.[8-10] Studies suggest that even mild dehydration can impair cognitive function in the short-term.[8] So next time you need to focus, take a test, or use all of your brainpower, keep a glass of water next to you and keep sipping.
  5. Prevent headaches. Water deprivation is a very common cause of headache. In most cases, rehydrating can provide relief from a headache. For some people, dehydration can also trigger a migraine, so be sure to keep your water intake regular if you are prone to getting migraines or headaches.[1]
  6. Protect against disease. Proper hydration may be a useful preventative tool for a variety of health conditions and diseases. Staying hydrated may protect against kidney stones, constipation, asthma, urinary tract infections, coronary heart disease, and even possibly some cancers.[1,11]

How Much Water Should You Drink?

The amount of water you need to drink will depend on several factors, including your age, gender, activity level, and more. However, a good general guideline is at least 2.21 liters per day for women and 3 liters per day for men.[2]

Increase your intake as you increase your activity level. Be sure to always drink filtered water to avoid toxins found in tap water. For tips on choosing the best water filter, read more here.

As you age, you will likely feel less thirsty and thus be prone to drinking less fluid.[1] However, hydration is as important as ever in old age, so be sure to keep water on hand and drink regularly throughout the day, even if you don’t feel thirsty.

Need help drinking more water? Keep track of your water intake by measuring your progress with a cup or water bottle placed in a spot you will see it throughout the day. Set goals for yourself at time points throughout the day to make sure you are drinking enough.

To learn more about dehydration, read The Dangers of Dehydration: Swollen Eyes and a Shrunken Brain.

Share Your Experience

Do you stay well hydrated? Do you feel a difference when you don’t drink enough water? Share your thoughts on the importance of water in the comments section below.

Originally published in May 2015 and updated.

[1] Nutr Rev. 2010 Aug;68(8):439-58.

[2] Eur J Clin Nutr. 2010 Feb;64(2):115-23.

[3] Nutrition. 2004 Jul-Aug;20(7-8):651-6.

[4] Athl Train. 2006 Jan-Mar;41(1):36-45.

[5] Obesity (Silver Spring). 2010 Feb;18(2):300-7.

[6] Obesity (Silver Spring). 2008 Nov;16(11):2481-8.

[7] PLoS One. 2014 Apr 11;9(4):e94754.

[8] ACSMs Health Fit J. 2013 Nov;17(6):21-28.

[9] Appetite. 2009 Jun;52(3):776-9.

[10] Appetite. 2013 Jan;60(1):148-53.

[11] Nutr Rev. 2005 Jun;63(6 Pt 2):S2-5.

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