Water is essential to the survival of every life form on earth. Plants, animals and humans all need water. Our planet is mostly water, with approximately 70 per cent of the earth’s surface being made of water.

In humans, it carries nutrients to organs and tissues, removes waste and helps to regulate body temperature. Water is also necessary for removing dirt and bacteria from the body. A human may be able to survive for a few weeks without food, but they would not be able to survive for more than a few days without water.

How much water is needed?

The intake of water recommended is normally at least eight glasses per day, but the amount needed can vary depending on the individual and their activities.

Some experts recommend that a person drinks half their body weight in water each day, so the amount will vary greatly between individuals.

Other factors that will have an effect on the amount needed include the level of physical activity and the climate.

Problems caused by insufficient intake of water

If a person does not consume enough water, various health problems may arise.

Those who are suffering from mild dehydration may experience symptoms including headaches, constipation and muscle pain.

Longer term problems can also arise if a person is constantly failing to consume a sufficient amount of water. These include digestive disorders, respiratory problems, high or low blood pressure and high cholesterol.

Benefits of drinking water

Not only is drinking water necessary to remain healthy, it can also improve health in certain areas.

Those who are trying to lose weight may find it beneficial to increase their water intake. Drinking water can prevent snacking by providing a feeling of fullness, as well as providing the energy needed for exercise.

Drinking a sufficient amount of water can also help to improve the digestion. Water can clean the digestive tract, as well as working with enzymes and friendly bacteria to maintain optimum nutrient absorption.

It is thought that being properly hydrated on a daily basis may help to improve brain function. Those who are well hydrated may experience greater focus and creativity.

How to get enough water

Approximately 20 percent of the water required comes from food, the rest comes from drink.

Drinking pure water is the best way to get the recommended intake, as it has no calories or artificial ingredients. If more flavour is required, lemon can be added.

All fluids count towards the daily intake, so fruit juices and herbal teas can also be consumed. Although caffeinated drinks do count towards the fluid intake, caffeine can act as a diuretic, which may increase the amount of water lost by the body. Soft drinks should also be consumed with caution as they contain added sugar, which means more calories but no added nutritional value.

It is thought that many people are not consuming enough water, although they may not realise it. Those who increase their fluid intake may notice various benefits, such as increased mental clarity and more energy.