Why hydration is important for human body?

Hydration is essential for maintaining overall health and well-being. Water plays numerous critical roles in the body, such as regulating temperature, transporting nutrients, and removing waste. Proper hydration is crucial for physical performance, brain function, digestion, skin health, and cardiovascular efficiency. In this article here’s an overview of why staying hydrated is important and how much water you typically need.

What is hydration?

Hydration is the process of keeping your body supplied with fluids so that it can function properly. Every cell, tissue, and organ in your body needs water to work correctly. Water makes up about 60% of your body weight and is involved in many bodily function.


If you don’t drink enough fluids, you can become dehydrated. Dehydration can lead to a number of problems, including:

  1. Fatigue
  2. Headache
  3. Dizziness
  4. Constipation
  5. Kidney stones
  6. Urinary tract infections

Benefits of Hydration:

Regulates Body Temperature:

Water makes up about 60% of our body weight, and it plays a vital role in many bodily functions, including regulating body temperature. Here’s how hydration helps keep us cool:

  1. Sweating: When our body temperature rises, our body produces sweat. Sweat is a mixture of water, electrolytes, and waste products. As sweat evaporates from our skin, it takes heat with it, cooling us down. The more hydrated we are, the more sweat our body can produce.
  2. Blood circulation: Blood carries heat from our core (muscles, organs) to our periphery (skin). When we’re dehydrated, our blood volume decreases, making it less efficient at transporting heat away from our core and to the skin for cooling.
  3. Insulation: Even though it might seem counterintuitive, proper hydration helps insulate the body from external heat.  Dehydration can disrupt the delicate balance of fluids and electrolytes in the body, which can impair the skin’s ability to act as a barrier to heat.

Supports Cellular Functions:

Hydration is crucial for various cellular functions. Here’s how it supports them:

  1. Transporting Nutrients and Waste Products: Water acts as the body’s transportation system, carrying essential nutrients like glucose, amino acids, and minerals to your cells. It also carries waste products away from cells, allowing them to function efficiently.
  2. Regulating Body Temperature: Water absorbs and releases heat, helping your body maintain a constant internal temperature. This is especially important during exercise or hot weather, when your body produces more heat.
  3. Maintaining Cell Structure: Cells are mostly water, and proper hydration is essential for maintaining their shape and structure. When you’re dehydrated, cells shrink and can’t function properly.
  4. Lubricating Joints and Tissues: Water helps lubricate your joints and tissues, preventing friction and cushioning them from impact. This is important for maintaining joint health and flexibility.
  5. Aiding Digestion: Water helps break down food and move it through your digestive system. Dehydration can lead to constipation and other digestive problems.
  6. Protecting Organs: Water helps cushion your organs, protecting them from damage.

Aids Digestion and Nutrient Absorption:

Water is crucial for the digestive system, aiding in the breakdown of food and the absorption of nutrients. It also helps prevent constipation by keeping stools soft. Here’s how:

  1. Lubrication: Water acts as a lubricant throughout the digestive tract, from the moment food enters your mouth. Saliva, which is mostly water, moistens food, making it easier to chew and swallow. As food travels through the esophagus, stomach, and intestines, adequate water content ensures smooth passage and prevents constipation.
  2. Breakdown of Food: Water is a crucial component of digestive juices in the stomach and intestines. These juices break down complex molecules in food, such as carbohydrates, proteins, and fats, into simpler forms that your body can absorb.
  3. Nutrient Absorption: Water is the medium that transports broken-down nutrients from the small intestine into your bloodstream. Proper hydration ensures efficient absorption of vitamins, minerals, and other essential nutrients from your food.
  4. Gut Microbiome: Dehydration can disrupt the delicate balance of good and bad bacteria in your gut microbiome. Adequate water intake helps maintain a healthy gut environment, which is crucial for digestion and overall health.

Maintains Blood Pressure:

Proper hydration ensures that the blood volume is adequate, which helps maintain healthy blood pressure levels. Hydration plays a vital role in maintaining healthy blood pressure. Here’s how:

  1. Blood Volume: Blood is about 90% water, so it makes sense that staying hydrated directly impacts blood volume. When you’re dehydrated, your blood volume decreases. This decrease in volume makes your heart work harder to pump blood throughout your body, which can lead to an increase in blood pressure.
  2. Electrolytes: Electrolytes are minerals in your blood that help regulate many bodily functions, including blood pressure. When you’re dehydrated, the balance of electrolytes in your blood can become disrupted. This imbalance can also contribute to high blood pressure.
  3. Blood Vessel Function: Proper hydration helps keep your blood vessels elastic and flexible. This allows them to dilate (widen) and constrict (narrow) as needed to regulate blood pressure. When you’re dehydrated, your blood vessels become stiffer and less able to relax, which can also lead to high blood pressure.

Lubricates Joints:

Hydration plays a vital role in lubricating your joints. Our joints are lined with cartilage, a tough and slippery tissue that cushions the bones and allows for smooth movement. Cartilage is about 65% to 80% water. When you’re dehydrated, your body can’t produce enough synovial fluid, the lubricant that surrounds and nourishes your joints. This can lead to friction, which can cause pain and stiffness.

Here’s a closer look at how hydration helps lubricate your joints:

  1. Synovial Fluid Production: Synovial fluid is a thick, lubricating fluid that surrounds your joints. It acts like a shock absorber, cushioning the bones and preventing them from rubbing together. Synovial fluid is made up of hyaluronic acid, a substance that attracts and binds water molecules. When you’re dehydrated, your body doesn’t have enough water to produce synovial fluid, which can lead to friction and pain in your joints.
  2. Cartilage Health: Cartilage is a tough, rubbery tissue that covers the ends of your bones. It helps to absorb shock and keep your joints moving smoothly. Cartilage is also about 65% to 80% water. When you’re dehydrated, the cartilage can become dry and brittle. This can make it more susceptible to wear and tear, which can lead to pain and arthritis.
  3. Nutrient Delivery: Synovial fluid also helps to deliver nutrients to the cartilage and remove waste products. When you’re dehydrated, this process can be slowed down, which can further damage the cartilage.

Detoxifies the Body:

Hydration supports kidney function, which is essential for filtering out toxins and waste products from the bloodstream and excreting them through urine. It plays a vital role in the body’s natural detoxification process. Here’s how:

  1. Transporting Waste: Water acts as a carrier, dissolving and transporting waste products created by cellular activity throughout the body. These waste products are then delivered to the kidneys for elimination through urine.
  2. Kidney Function: When adequately hydrated, kidneys function optimally, filtering and flushing out toxins more efficiently. Dehydration hinders this process, causing waste buildup and potentially leading to health problems.
  3. Bowel Movement: Proper hydration keeps your digestive system running smoothly. Water helps soften stool and ensures regular bowel movements, eliminating waste products that can accumulate in the gut.
  4. Sweating: Sweating is another way the body eliminates toxins and excess heat. Adequate hydration allows you to sweat effectively, releasing toxins and maintaining body temperature.

Improves Skin Health:

Adequate water intake helps maintain skin elasticity and reduces the appearance of dryness and wrinkles, promoting a healthy, youthful complexion.

Here’s how hydration benefits your skin:

  1. Plumper, Younger Look: Well-hydrated skin has a plump appearance, reducing the look of fine lines and wrinkles. Dehydrated skin looks dull and tired.
  2. Elasticity and Bounce: Water helps skin maintain elasticity, which allows it to snap back after being pinched. Dehydrated skin loses elasticity and can appear saggy.
  3. Flushes Toxins: Drinking enough water helps your body eliminate toxins that can show up on your skin.
  4. Reduces Acne Breakouts: Dehydration can trigger excess oil production, which can lead to breakouts. Proper hydration helps regulate oil production.
  5. Healthy Skin Barrier: Hydration is key to maintaining a healthy skin barrier, which protects your skin from harmful substances and keeps moisture in.

Enhances Cognitive Function:

Dehydration can impair concentration, memory, and overall cognitive performance. Staying hydrated supports brain function and mental clarity.

Our brain is made up of about 80% water, so it makes sense that staying hydrated is essential for optimal brain function. Studies have shown that even mild dehydration can negatively impact cognitive function, including attention, memory, and reaction time. Dehydration can also lead to headaches, fatigue, and difficulty concentrating.

Here’s how hydration can improve cognitive function:

  1. Boosts alertness and concentration: When you’re dehydrated, your blood volume decreases, which can make your heart work harder to pump blood throughout your body, including to your brain. This can lead to fatigue and difficulty concentrating.
  2. Enhances memory and learning: Dehydration can impair the communication between brain cells, which can negatively affect memory and learning.
  3. Improves mood and well-being: Studies have shown that dehydration can lead to headaches, irritability, and difficulty regulating emotions.
  4. Reduces fatigue and headaches: Dehydration can cause fatigue and headaches, both of which can hinder your ability to think clearly and focus.

How Much Water Do You Need?

The amount of water each person needs can vary based on several factors including age, gender, climate, activity level, and overall health. However, general guidelines can help you determine your daily water intake:

General Recommendation:

The National Academies of Sciences, Engineering, and Medicine recommend a daily water intake of about 3.7 liters (125 ounces) for men and 2.7 liters (91 ounces) for women. This includes all fluids consumed from both beverages and food.

Eight 8-Ounce Glasses Rule:

A simpler guideline often recommended is the “8×8 rule,” which suggests drinking eight 8-ounce glasses of water a day, totaling about 2 liters or half a gallon. This is easy to remember and a good baseline for many people.

Individual Needs:

Your individual needs may vary. Factors such as exercise, hot weather, pregnancy, and breastfeeding increase your fluid requirements. Athletes or individuals with physically demanding jobs may need more water to stay adequately hydrated.

Tips for Staying Hydrated:

  1. Drink Regularly: Sip water throughout the day rather than consuming large amounts all at once.
  2. Monitor Your Urine: Pale yellow urine typically indicates good hydration, while dark yellow or amber urine suggests you need to drink more water.
  3. Eat Water-Rich Foods: Include fruits and vegetables with high water content in your diet, such as cucumbers, oranges, and watermelon.
  4. Carry a Water Bottle: Keep a reusable water bottle with you to make drinking water convenient and accessible.
  5. Set Reminders: Use alarms or apps to remind you to drink water regularly, especially if you tend to forget.

What are health problems due to dehydration?

Dehydration occurs when your body loses more fluids than it takes in. This can happen due to excessive sweating, vomiting, diarrhea, or simply not drinking enough fluids.  Mild dehydration can cause thirst, fatigue, and headaches. But severe dehydration can lead to serious health problems, including:

  1. Heat injury: Dehydration can worsen heat-related illnesses like heat cramps, heat exhaustion, and heatstroke.
  2. Urinary tract infections (UTIs): When you’re dehydrated, your urine becomes more concentrated, which can irritate your bladder and increase your risk of UTIs.
  3. Kidney stones: Dehydration can contribute to the formation of kidney stones.
  4. Kidney failure: Chronically dehydrated individuals are more likely to experience kidney failure.
  5. Seizures: In severe cases, dehydration can lead to electrolyte imbalances that can trigger seizures.
  6. Low blood volume shock: This is a life-threatening condition that occurs when dehydration causes a significant drop in blood volume. It can lead to shock, coma, and even death.


Maintaining proper hydration is key to supporting numerous bodily functions and promoting overall health. Adjust your water intake based on your personal needs and lifestyle to ensure you stay adequately hydrated.


What is the deficiency of water?

The deficiency of water in the body is called dehydration. It occurs when you lose more fluids than you take in. This can happen due to several reasons, including sweating, vomiting, diarrhea, fever, or not drinking enough fluids.

Dehydration can cause a variety of symptoms, including thirst, fatigue, headache, dizziness, and constipation. In severe cases, it can lead to kidney failure, coma, and even death.

What happens if I drink too much water?

While staying hydrated is important, drinking too much water can lead to some issues. The main concern is a condition called hyponatremia, which is when your electrolytes, especially sodium, get diluted in your bloodstream. This happens because your kidneys can’t get rid of the excess water fast enough.


Here are some symptoms of drinking too much water:

  1. Nausea and vomiting
  2. Headaches
  3. Muscle cramps and weakness
  4. Disorientation and confusion
  5. In severe cases, swelling in the brain which can be life-threatening

It’s important to note that this is uncommon for healthy adults. People who are more at risk include athletes during intense exercise or endurance events, and people with certain medical conditions.

Does drinking water clear skin?

While there isn’t conclusive scientific evidence that drinking a ton of water will directly cause clear skin, staying hydrated can contribute to overall skin health.  Here’s the breakdown:

  1. Hydration helps: When you’re dehydrated, your skin can appear dull and rough. Drinking enough water plumps up your skin cells, giving you a more radiant appearance.
  2. Flushing toxins: Water helps your body eliminate waste products. Some believe this flushing action can help reduce acne breakouts.
  3. Balanced oil production: Dehydration can cause your skin to overproduce oil, which can lead to clogged pores and breakouts. Drinking enough water can help regulate oil production.

However, if you’re already well-hydrated, there’s no guarantee that drinking even more water will make a significant difference in your skin.  For stubborn skin concerns, it’s always best to consult a dermatologist.

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