12 Benefits of Drinking More Water: What Happens When You Stay Hydrated

Water is the most essential nutrient your body needs, yet most people in the UK do not drink enough of it. According to a survey by the Natural Hydration Council, around one in five UK adults drinks less than the NHS recommended minimum of 6 to 8 glasses per day.

The effects of even mild dehydration are surprisingly wide-reaching. From reduced energy and poor concentration to dull skin and sluggish digestion, not drinking enough water affects almost every system in your body. This guide covers 12 evidence-based benefits of increasing your daily water intake, with practical advice on how to make it happen.

1. More Energy Throughout the Day

Fatigue is one of the earliest symptoms of dehydration. When your body loses even 1 to 2% of its water content, blood volume decreases. Your heart has to work harder to pump blood to your muscles and organs, which results in that familiar mid-afternoon sluggishness.

Research published in the Journal of Nutrition found that mild dehydration in young women caused significant increases in fatigue, decreased motivation, and worsened mood. The participants were only 1.36% dehydrated, which is less than most people notice. Drinking consistently throughout the day prevents this energy dip before it starts.

2. Healthier, Clearer Skin

Your skin is your body's largest organ, and it is approximately 64% water. When you are dehydrated, your skin loses elasticity, appears dull, and fine lines become more visible. While drinking water will not cure acne or erase wrinkles, consistent hydration supports the skin's natural barrier function and helps maintain a healthy complexion.

A study in the International Journal of Cosmetic Science found that increasing daily water intake by 2 litres improved skin hydration, elasticity, and roughness within two weeks. The effect was most pronounced in participants who were previously under-hydrating.

3. Sharper Focus and Concentration

Your brain is roughly 75% water, and it is extremely sensitive to fluid changes. Research from the University of East London found that drinking water before a cognitive task improved reaction time by 14%. Conversely, dehydration of just 2% impaired attention, working memory, and psychomotor skills.

If you work at a desk, study, or need to concentrate for long periods, keeping a water bottle within reach is one of the simplest ways to maintain mental performance. The ProWorks Switch 1L sits on a desk without condensation and the straw lid makes sipping effortless throughout the day.

4. Better Digestion

Water is essential for every stage of digestion. It helps break down food in the stomach, supports nutrient absorption in the small intestine, and softens stool in the large intestine to prevent constipation. The NHS lists not drinking enough fluids as one of the primary causes of constipation in the UK.

Drinking a glass of water 30 minutes before a meal can also improve digestive comfort. It primes the stomach lining and helps produce adequate gastric acid for efficient breakdown of food. For more on how much to drink based on your body, see our water intake by weight guide.

5. Joint and Muscle Support

The cartilage in your joints is roughly 80% water. When you are well hydrated, this cartilage stays supple and provides effective cushioning between bones. Chronic dehydration can reduce the shock-absorbing capacity of your joints, leading to increased stiffness and discomfort, particularly during exercise.

Muscles also require adequate water to function properly. Dehydrated muscles are more prone to cramping and fatigue. If you exercise regularly, maintaining hydration before, during, and after your workout is essential for both performance and recovery. A sports water bottle with sufficient capacity helps you stay on top of fluid replacement.

6. Kidney Function and Detoxification

Your kidneys filter approximately 180 litres of blood per day, producing around 1.5 litres of urine to remove waste products. Adequate water intake ensures your kidneys can perform this filtration efficiently. Chronic under-hydration is a significant risk factor for kidney stones, which affect around 1 in 10 people in the UK at some point in their lives.

The colour of your urine is the simplest indicator of hydration status. Pale straw is ideal. Dark yellow or amber indicates you need to drink more. If you struggle to monitor intake, using a water bottle with time markings can help you track progress throughout the day.

6 More Benefits You Should Know

7. Supports Healthy Weight Management

Drinking water before meals has been shown to reduce calorie intake. A study from the University of Birmingham found that participants who drank 500ml of water 30 minutes before each main meal lost an average of 1.3kg more than the control group over 12 weeks. Water also has zero calories, making it the best replacement for sugary drinks.

8. Regulates Body Temperature

Your body relies on sweat to cool down during exercise and hot weather. Without adequate water intake, sweat production decreases and your core temperature rises, increasing the risk of heat exhaustion. Keeping cold water available in an insulated bottle helps your body regulate temperature more effectively.

9. Reduces Headaches

Dehydration is one of the most common triggers for headaches and migraines. A study in the European Journal of Neurology found that increasing water intake by 1.5 litres per day reduced the total number of headache hours and intensity in chronic headache sufferers. Before reaching for painkillers, try drinking a glass of water.

10. Improves Mood

Hydration and mood are closely linked. Research shows that even mild dehydration can cause irritability, anxiety, and difficulty concentrating. A study published in the Journal of Nutrition found that women who were mildly dehydrated experienced degraded mood, increased perception of task difficulty, and lower concentration.

11. Supports Heart Health

When you are dehydrated, your blood becomes thicker, making it harder for your heart to pump it around your body. Staying well hydrated helps maintain healthy blood viscosity and supports overall cardiovascular function. A study in the American Journal of Epidemiology found that drinking five or more glasses of water per day was associated with a lower risk of coronary heart disease.

12. Boosts Exercise Performance

Losing just 2% of your body weight through sweat can reduce exercise performance by up to 25%. Proper hydration maintains blood volume, regulates body temperature, and ensures your muscles receive the oxygen and nutrients they need. For optimal performance, drink before, during, and after exercise. Our guide to the best sports water bottles covers the ideal capacity and features for training.

How Much Water Do You Need?

The NHS recommends 6 to 8 glasses of fluid per day, which equates to roughly 1.2 litres. However, this is a general guideline. Your actual needs depend on your body weight, activity level, climate, and diet. For a personalised calculation, use our water intake by weight calculator.

As a general rule, aim for approximately 30 to 35ml of water per kilogram of body weight. A person weighing 70kg would need around 2.1 to 2.45 litres per day. Add more if you exercise, work outdoors, or live in a warm environment.

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Practical Tips for Staying Hydrated

Knowing the benefits is one thing. Actually drinking enough water is another. Here are practical strategies that work.

• Carry a bottle everywhere: If you have water within reach, you will drink more. An insulated bottle keeps it at your preferred temperature all day.
• Drink first thing in the morning: Your body loses water overnight through breathing and perspiration. Start the day with a glass of water before tea or coffee.
• Set reminders: Use your phone or a time-marked bottle to prompt regular sipping.
• Eat water-rich foods: Cucumber, watermelon, oranges, and lettuce are all over 90% water and contribute to your daily intake.
• Replace sugary drinks: Swapping one fizzy drink per day for water saves calories and improves hydration.
• Drink before you feel thirsty: Thirst is a late indicator of dehydration. By the time you feel thirsty, you are already mildly dehydrated.

The Bottom Line

The benefits of drinking more water are backed by extensive research. From increased energy and better skin to sharper focus and improved digestion, water affects virtually every function in your body. Most adults in the UK do not drink enough, and the effects of even mild dehydration are more significant than most people realise.

The simplest way to improve your hydration is to carry a bottle and drink from it regularly. The ProWorks Switch 1L makes this easy with a straw lid for effortless sipping, double-wall insulation to keep water cold for 24 hours, and a 1 litre capacity that covers half your daily minimum in a single fill. Available in Stealth Black, Arctic White, Sage Green, and Blossom Pink.

For more on hydration science, read our guides on whether cold water hydrates you faster and water intake by weight.