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Why Is Water So Important? Here’s What You Need to Know

How water works in your body, how much water do you need, how to stay hydrated.

Water is a major component of your body, accounting for 50–60% of your total weight. It is vital for many important body functions, from flushing out waste to lubricating your joints.

Your body constantly loses water throughout the day through urinating, sweating, and breathing. You should consume enough water from foods and beverages daily to prevent dehydration .

This article covers research-backed reasons why your body needs water and how much you need each day.

Klaus Vedfelt / Getty Images

All body cells, organs, and tissues require water to function. Generally, a person can only survive without water for a few days.  

It Maintains a Normal Body Temperature

Water regulates our internal temperature by distributing heat throughout the body and cooling it through perspiration (sweat).

When the body becomes too hot, it loses water through sweat . The evaporation of sweat from the skin cools the body, keeping its temperature within a normal range.

If a person becomes dehydrated, they can't produce enough sweat to cool their body. This can cause the body's temperature to reach dangerous levels, leading to heat stroke .

Avoid dehydration by drinking plenty of water if you're working outside or sweating more than usual.

It Protects Your Joints, Spinal Cord, and Other Tissues

Water acts as a lubricant in the mouth (through saliva ) and the eyes (through tears) to help prevent dryness. It's necessary to produce synovial fluid , which lubricates, cushions, and protects the joints.

Water also helps protect the spinal cord and prevents injuries by increasing tissue flexibility and elasticity.

It Transports Nutrients and Gets Rid of Waste

As a major component of blood, water helps transport nutrients and oxygen to cells throughout the body. Water also helps carry waste from the body for excretion through perspiration, urination, and bowel movements.

The kidneys need water to effectively filter waste from the blood and flush it from the body as urine. Staying adequately hydrated helps prevent kidney stones and urinary tract infections (UTIs) , which can harm the kidneys.

Prevents Dehydration

Drinking water daily can help prevent dehydration, a condition that occurs when you lose more fluids than you absorb.

Early signs of dehydration include:

  • Feeling thirsty
  • Dark-colored urine
  • Urinating less than usual

Because water is involved in so many body functions, dehydration can eventually cause life-threatening symptoms, including:

  • Rapid breathing
  • Rapid heartbeat
  • Inability to urinate

People who exercise in the heat, work outdoors, or have certain health conditions that cause them to urinate or sweat more than usual are at a greater risk of dehydration.

It Aids Digestion

Your saliva is primarily made up of water. Saliva is a digestive juice that moistens food, allowing it to move easily through the esophagus into your stomach. Saliva also contains enzymes that help break down starches in food.

As the digestive process continues, water helps break down food, allowing your body to absorb nutrients. Water also makes bowel movements easier.

It Protects Against Chronic Illness and Boosts Longevity

Adequate hydration is linked to healthy aging and longevity. One potential reason for this is that decreased water intake can lead to higher sodium concentrations in the blood, which raises the risk of chronic disease.

Studies suggest that adults who stay hydrated are healthier and less likely to develop chronic diseases, including heart and lung disease . Well-hydrated adults also seem to live longer than adults who don't consume enough fluids.

It Improves Mood and Cognitive Function

Dehydration may cause fatigue and confusion and may be linked to symptoms of anger and depression. In a small study, it was linked to poor cognitive function, potentially affecting attention span and working memory.

One study of young adults looked at the effects of water on cognitive performance and mood after 12 hours of water restriction. Researchers found that 200 milliliters of water improved thirst, anger, fatigue, and overall mood. However, 500 milliliters was optimal, improving mood and cognitive performance.

The amount of water you need depends on several factors, including age, sex, activity level, and health status.

For healthy individuals, the adequate daily water intake is around 11.5 cups for women and about 15.5 cups for men. This includes fluids consumed from all foods and beverages.

Experts estimate that most people get around 20% of their daily water intake from food. This means women should drink about 9 cups of fluid daily, while men should aim for 13 cups to maintain adequate hydration.

People who live in warmer climates, are more physically active, or are experiencing an illness that causes fever and/or diarrhea or vomiting have increased fluid needs.

One easy way to see if you are properly hydrated is to check the color of your urine. If you are drinking enough water, your urine will be pale yellow. If it is dark, you may need to increase your consumption.

Individuals with heart failure or kidney disease may need to limit their fluid intake.

Can You Drink Too Much Water?

Drinking too much water can lead to water intoxication or overhydration, which occurs when the kidneys cannot flush out excess water. This can cause a medical emergency due to decreased sodium concentrations in the blood ( hyponatremia ). To avoid water intoxication, do not drink more than 48 ounces, or six cups, per hour.

If you find it challenging to stay hydrated, here are some helpful tips to keep in mind:

  • Keep a reusable water bottle with you and refill it throughout the day
  • Choose water or sparkling water instead of sugary beverages
  • When you feel thirsty, drink water
  • Change things up by squeezing fresh lemon or lime into your water or adding a few berries or cucumber slices
  • Snack on water-rich fruits and vegetables , including watermelon, cantaloupe, lettuce, and celery, throughout the day
  • Keep track of your water intake by using a water tracker app
  • Drink water with all meals

Water is vital for your health. It is necessary for temperature regulation, digestion, nutrient absorption, and body waste removal. Drinking water daily can prevent dehydration, a condition that can cause mood and memory problems, constipation, and kidney stones.

People who work in high temperatures, exercise at high intensities, or are sick are at a greater risk of dehydration. Talk to a healthcare provider or registered dietitian to determine the right amount of water for you.

Zhou HL, Wei MH, Cui Y, et al. Association between water intake and mortality risk-evidence from a national prospective study .  Front Nutr . 2022;9:822119. doi:10.3389/fnut.2022.822119

Academy of Nutrition and Dietetics. How much water do you need?

MaineDOT. The importance of hydration .

Johns Hopkins Medicine. Dehydration and heat stroke .

Lorenzo I, Serra-Prat M, Yébenes JC. The role of water homeostasis in muscle function and frailty: a review .  Nutrients . 2019;11(8):1857. doi:10.3390/nu11081857

Centers for Disease Control and Prevention. Water and healthier drinks .

National Kidney Foundation. 6 tips to be "water wise" for healthy kidneys .

MedlinePlus. Dehydration .

National Institute of Diabetes and Digestive and Kidney Diseases. Your digestive system & how it works .

National Institute of Diabetes and Digestive and Kidney Diseases. Eating, diet, & nutrition for constipation .

National Heart, Lung, and Blood Institute. Good hydration linked to healthy aging .

Zhang J, Zhang N, He H, et al. Different amounts of water supplementation improved cognitive performance and mood among young adults after 12 h water restriction in Baoding, China: a randomized controlled trial (RCT) .  Int J Environ Res Public Health . 2020;17(21):7792. doi:10.3390/ijerph17217792

National Kidney Foundation. The dos and don'ts of fluid management for kidney disease .

MedlinePlus. Heart failure .

Joo MA, Kim EY. Hyponatremia caused by excessive intake of water as a form of child abuse .  Ann Pediatr Endocrinol Metab . 2013;18(2):95-98. doi:10.6065/apem.2013.18.2.95

Centers for Disease Control and Prevention. Heat stress: hydration .

By Lindsey DeSoto, RD, LD Lindsey Desoto is a registered dietitian with experience working with clients to improve their diet for health-related reasons. She enjoys staying up to date on the latest research and translating nutrition science into practical eating advice to help others live healthier lives.

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Essay on Drinking Water

Students are often asked to write an essay on Drinking Water in their schools and colleges. And if you’re also looking for the same, we have created 100-word, 250-word, and 500-word essays on the topic.

Let’s take a look…

100 Words Essay on Drinking Water

Importance of drinking water.

Water is life’s essential ingredient. Our bodies are about 60% water. Drinking water keeps us hydrated, which is vital for our bodily functions.

Benefits of Drinking Water

Drinking water aids in digestion, nutrient absorption, and maintains body temperature. It also helps in flushing out toxins and keeps our skin healthy.

How Much Water to Drink?

Experts suggest drinking 8-10 glasses of water daily. However, this can vary based on physical activity and climate.

Drinking water is crucial for our health. So, let’s make a habit of consuming enough every day.

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Also check:

  • Advantages and Disadvantages of Drinking Water

250 Words Essay on Drinking Water

The importance of drinking water.

Water is a fundamental element of life. Covering about 70% of the Earth’s surface, it’s also the primary component of the human body. However, the importance of drinking water extends beyond mere existence. It plays a vital role in our physical and mental health, and even in societal development.

Physiological Benefits

Water is the medium of all metabolic processes in the body. It aids in digestion, nutrient absorption, and waste elimination. It regulates body temperature, lubricates joints, and maintains skin health. Dehydration, on the other hand, can lead to fatigue, headaches, and impaired cognitive function.

Mental Health Implications

The brain is approximately 75% water. Hence, adequate hydration is necessary for optimal brain function. Studies suggest that even mild dehydration can affect mood, concentration, and memory. Furthermore, it can exacerbate symptoms of certain mental disorders.

Societal Relevance

Access to clean drinking water is a global concern. It’s not just about health, but also about social equality and economic growth. Water scarcity can lead to conflicts and migration, while waterborne diseases can cripple communities.

In essence, drinking water is not just a basic need, but a cornerstone of human health and societal progress. As we delve deeper into the intricacies of our bodies and societies, the importance of this clear, tasteless liquid becomes even more apparent. We must therefore strive for its conservation and equitable distribution, recognizing it as a critical component of our collective wellbeing.

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500 Words Essay on Drinking Water


Water is the essence of life, a fundamental element for all living organisms on Earth. The significance of drinking water cannot be overstated. It is a critical component of our diet, directly linked to our health and wellbeing. This essay will delve into the importance of drinking water, its health benefits, the challenges of water scarcity, and the need for sustainable management of this vital resource.

Water makes up about 60% of the human body, highlighting its role in maintaining bodily functions. It aids in digestion, nutrient absorption, and waste elimination. It also helps regulate body temperature, lubricate joints, and protect sensitive tissues. Dehydration, or the lack of adequate water in the body, can lead to serious health issues such as kidney stones, urinary tract infections, and even cognitive impairment.

Health Benefits of Drinking Water

Drinking sufficient water has numerous health benefits. It boosts skin health and beauty, flushing out toxins and promoting a clear complexion. It aids in weight loss by enhancing metabolism and suppressing appetite. Furthermore, it plays a crucial role in maintaining cardiovascular health by facilitating the flow of oxygen and nutrients in the blood.

Challenges of Water Scarcity

Despite the critical role of water, it is a scarce resource for many. According to the World Health Organization, nearly 2.2 billion people worldwide lack access to safely managed drinking water services. Water scarcity can lead to a range of health issues, including malnutrition and waterborne diseases. It also exacerbates socio-economic disparities, as the poor and marginalized are often the most affected by water scarcity.

Sustainable Water Management

Given the importance and scarcity of water, sustainable water management is imperative. It involves the efficient use of water resources, reducing waste, and promoting conservation. For instance, rainwater harvesting and wastewater treatment can provide alternative sources of water. Additionally, awareness campaigns can educate the public about the importance of water conservation and the dire consequences of wastage.

In conclusion, drinking water is a fundamental human need and a critical component of our health and wellbeing. However, water scarcity is a pressing issue that threatens our ability to meet this basic need. Therefore, it is crucial to prioritize sustainable water management, promoting water conservation, and ensuring equitable access to clean, safe drinking water for all. By doing so, we can safeguard our health and secure a sustainable future for generations to come.

That’s it! I hope the essay helped you.

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If you’re looking for more, here are essays on other interesting topics:

  • Essay on Clean Water and Sanitation
  • Essay on Challenges of Clean Water and Their Solutions
  • Essay on Bottled Water

Apart from these, you can look at all the essays by clicking here .

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Importance of Water Essay for Students and Children

500+ words essay on importance of water.

Water is the basic necessity for the functioning of all life forms that exist on earth . It is safe to say that water is the reason behind earth being the only planet to support life. This universal solvent is one of the major resources we have on this planet . It is impossible for life to function without water. After all, it makes for almost 70% of the earth.

Importance of Water Essay

However, despite its vast abundance, water is very much limited. It is a non-renewable resource . In addition, we need to realize the fact that although there is an abundance of water, not all of it is safe to consume. We derive some very essential uses from the water on a daily basis.

Significance of water

If we talk about our personal lives, water is the foundation of our existence. The human body needs water for the day to day survival. We may be able to survive without any food for a whole week but without water, we won’t even survive for 3 days. Moreover, our body itself comprises of 70% water. This, in turn, helps our body to function normally.

Thus, the lack of sufficient water or consumption of contaminated water can cause serious health problems for humans. Therefore, the amount and quality of water which we consume is essential for our physical health plus fitness.

Further, our daily activities are incomplete without water. Whether we talk about getting up in the morning to brush or cooking our food, it is equally important. This domestic use of water makes us very dependent on this transparent chemical.

In addition, on a large scale, the industries consume a lot of water. They need water for almost every step of their process. It essential for the production of the goods we use every day.

If we look beyond human uses, we will realize how water plays a major role in every living beings life. It is the home of aquatic animals. From a tiny insect to a whale, every organism needs water to survive.

Therefore, we see how not only human beings but plants and animals too require water. The earth depends on water to function. We cannot be selfish and use it up for our uses without caring about the environment.

Get the huge list of more than 500 Essay Topics and Ideas

A world without water

Water is not only required for our survival but for a healthy and happy life as well. Everyone has seen the scenario of water-deprived countries like Africa, where citizens are leading a miserable life. It is time for everyone to wake up and realize the urgency of conserving water.

In other words, a world without water would make the human race impossible to last. The same can be said for all the animals and plants. In fact, the whole earth will suffer without water.

essay on drinking water

Firstly, the greenery will soon diminish. When earth won’t get water, all the vegetation will die and turn into barren land. The occurrence of different seasons will soon cease. The earth will be caught in one big endless summer.

Furthermore, the home of aquatic animals will be taken from them. That means no fishes and whales for us to see. Most importantly, all forms of living organisms will go extinct if we do not conserve water right away.

In conclusion, unnecessary usage of water must be stopped at once. Every single person must work to conserve water and restore the balance. If not, we all know what the consequences are going to be.

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