What are the health benefits of drinking water?

Everyone knows that it's important to stay hydrated – but what are the reasons why? We asked a nutritionist to explain nine benefits of drinking enough water.

A woman pouring water into a glass

Drinking enough water, or staying hydrated, is the first rule of health and nutrition. Our bodies can supposedly last weeks without food and yet just a few days without water. This makes sense when you think that our bodies are made up of about 60% water and that being dehydrated can begin to affect us both physically and mentally.

Benefits of drinking water

It may improve memory and mood

Research has shown that even mild dehydration can impair memory and mood in everyone from children to the elderly.

It can help reduce sugar cravings and aid weight maintenance

The brain can’t actually tell the difference between hunger and thirst, so often we can mistake thirst as a ‘sugar craving'. The next time you feel the need for something sweet, try drinking a glass of water first.

Staying hydrated may also help with weight maintenance. Research has shown that having water before a meal may fill you up more and therefore promote weight loss by eating less at the meal. This is also true in a 2015 study that swapped diet drinks for water. The results showed this may lead to greater weight reduction and also improved insulin resistance.

It may improve exercise performance

There has been a lot of research into the effects of hydration or dehydration in athletes, and the results all pretty much conclude that dehydration not only affects sports performance but also physiological function too.

It may reduce headaches and migraines

A lack of water may increase the risk of a headache or migraines in some individuals.

It may help prevent constipation in children and adults

Water helps to ‘keep things moving’ in the digestive system, and so staying hydrated can help prevent constipation in children, adults and the elderly.

There is some evidence that fizzy water may be of particular benefit too.

Four glasses of sparkling water

It may help to prevent kidney stones

Poor hydration may increase the risk of developing or reoccurrence of kidney stones in some individuals.  

It may help reduce the risk of bladder infections

Some studies have shown that drinking more water can reduce the risk of bladder infections and urinary tract infections, such as cystitis, in women.

It may reduce a hangover

While drinking water won’t prevent a hangover, some research suggests that being hydrated can reduce some of the negative after-effects of drinking alcohol. Alcohol is a diuretic and therefore makes the body lose more water then you take in.

It may help to manage anxiety

Hydration has an impact on the brain, as well as the body, and research has shown that even mild dehydration can have a negative impact on energy levels and moods, which may heighten the symptoms of anxiety.

How much water should we drink a day?

The NHS recommends consuming 6-8 glasses or cups a day, and it also includes lower fat milks, and low sugar or sugar-free drinks, tea and coffee within this intake.

Be mindful of added sugars or syrups in tea, coffee and soft drinks which will increase your overall sugar intake for the day.

You may also need more water if you are exercising or when the weather is hot, as we lose water through sweating.

A good way to check if you are hydrated is by the colour of your urine. Ideally, this should be a very pale yellow. If it is clear you could be drinking too much water, and it if it is darker you need to drink more. When checking the colour, be aware that some medications, supplements and some foods such as beetroot can also affect urine colour.

If you have any concerns, speak to your GP or other healthcare provider.

Now read

How much water should I drink a day?
The health benefits of lemon water
The best sports water bottles
Easy fruit-infused water ideas
How to stay hydrated


This article was published on 19 December 2019.

Nicola Shubrook is a nutritional therapist and works with both private clients and the corporate sector. She is an accredited member of the British Association for Nutrition and Lifestyle Medicine (BANT) and the Complementary & Natural Healthcare Council (CNHC). Find out more at urbanwellness.co.uk.

All health content on bbcgoodfood.com is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other healthcare professional. If you have any concerns about your general health, you should contact your local healthcare provider. See our website terms and conditions for more information.

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