Water makes up about 78% of our body, so it's hardly surprising that we react with other symptoms of dehydration when the amount coming out starts to be more than what's coming in.
Dr Amir Khan, who regularly appears on ITV's Lorraine and is woman&home's resident GP, says, "You should drink straight away if you feel thirsty, but there are other more subtle ways your body may tell you that you need to increase your fluid intake." This can be through water, but lower-fat milk, sugar-free drinks, tea, and coffee all count too, according to the NHS. Hydrating foods are a good option as well.
