Doctor explains why you should prioritise hydration in the winter and addresses whether 8 glasses a day is a myth

How can you tell if you are dehydrated during the winter?

Feeling thirsty is one of the first signs of dehydration, along with dry mouth and lips. If you don’t manage to drink enough water, then your body will try to conserve more water, mainly through the kidneys. So the colour of your urine will go darker, and you will need to go to the toilet less often. As the dehydration becomes more severe, you might start to feel lethargic, dizzy or even confused.

What are some things we all might be experiencing but aren’t aware of?

Sometimes, feeling sluggish and tired can be a sign of dehydration, which people sometimes put down to other things.

How much water should you drink a day?

The general guide of 2L of water per day is adequate for most people, but this does depend on a person’s weight, their level of activity, the temperature of the environment, certain medications, caffeine intake and whether they are suffering from diarrhoea and vomiting. If they are losing more water than normal, then they will need to drink more than 2L per day.

Is 8 glasses of water a day a myth?

8 glasses of 250ml would make 2L, so this is adequate for the average person on an average day.

Does your size change it?

Your body’s water requirement is weight dependent. Adults need roughly 30ml/kg/day. So a 50Kg person would need to drink 1.5L of water per day, and an 80Kg person would need 2.4L of water per day.

What’s an easy way to know we are getting enough and are hydrated?

Sip water regularly throughout the day to make sure that you don’t get the feeling of thirst. If you are well-hydrated, you should feel the need to empty your bladder regularly throughout the day, and your urine should be a pale yellow colour.

Do other liquids count towards your hydration intake?

Any drink which is not caffeinated and not alcoholic counts towards your fluid intake. Caffeinated drinks and alcohol don’t count because they make your body lose more water.

Any other ways to boost hydration other than drinking water?

There is water in many of the foods we eat as well, especially fruit and vegetables. Making a healthy smoothie by blending fruit and vegetables together is a great way to get your 5-a-day in as well as boosting your water intake. Soups and herbal teas are also great ways of boosting your fluid intake as well as providing some nutritional benefit.

What about brands selling water with electrolytes? Is this more hydrating or is it marketing?

These electrolyte drinks may be helpful in long distance runners or people who are suffering from diarrhoea or vomiting, but for the average person with an average level of activity who drinks enough water alongside a balanced diet, the electrolytes are really unnecessary. A lot of these drinks will also contain sugar, which may be extra calories that you don’t need.