How To Avoid Dehydration

In One Sentence: You can avoid dehydration by drinking six to eight glasses of fluid daily, eating water-rich foods, and replacing lost minerals when you sweat or feel unwell.

Introduction

Dehydration is incredibly common in the UK. Research by the International Longevity Centre UK suggests that many people only drink about half of the water they actually need every day[1]. Your body needs water to maintain healthy skin, flush waste from your kidneys, and keep your heart working properly. In this simple guide for UK Meds, we will explain exactly how to spot the early warning signs of fluid loss. We will also share the easiest daily habits to keep you perfectly hydrated at any age.

Key Takeaways

What is dehydration?

It is a condition where your body loses more water and essential minerals than it takes in. This stops your organs from working normally.

How much should I drink to avoid it?

The NHS Eatwell Guide recommends drinking six to eight cups of fluid every day. Water, lower fat milk, and sugar free drinks all count.

What is the fastest way to rehydrate?

Drinking an oral rehydration sachet mixed with water is the fastest way to replace lost fluids and vital minerals like sodium and potassium.

What is dehydration and what causes it?

Dehydration happens when your body loses more water than you take in. It is caused by not drinking enough or losing fluids quickly through heavy sweating, vomiting, diarrhoea, or drinking alcohol. This leaves your body unable to balance essential minerals, which stops your organs from working.

Because the human body is mostly water, losing even a small amount can cause problems. We constantly lose water throughout the day by simply breathing, sweating, and going to the toilet. Certain situations make you lose water much faster than normal. Here are the main causes:

• Hot Weather and Exercise: Higher temperatures and physical activity cause you to sweat heavily, draining your body of water.

• Illness: Sickness bugs that cause diarrhoea or vomiting rapidly strip your body of vital fluids. A high fever also causes you to sweat out moisture.

• Diuretic Drinks: Alcohol and highly caffeinated energy drinks force your kidneys to remove fluids from your blood faster, making you urinate more frequently.

• Medical Conditions: People with uncontrolled diabetes urinate more often as their kidneys try to get rid of excess sugar in the bloodstream.

What are the main signs of dehydration?

The most common early signs of dehydration are feeling thirsty, having a dry mouth, feeling dizzy, and producing dark yellow urine. You may also experience headaches and muscle cramps. If you feel thirsty, your body is already starting to become dehydrated.

Thirst is your body's alarm system. Do not ignore it. The warning signs can look very different depending on a person's age or medical history. Your urine colour is the best test. It should always be a clear, pale yellow colour. If it is dark yellow or brown, you need to drink water immediately.

Signs in Babies and Young Children

Infants are at a much higher risk of dehydration due to their low body weight. Because they cannot tell you they are thirsty, you must watch for physical clues. Look out for a lack of tears when crying, a sunken soft spot on top of their head, breathing faster than normal, and having fewer wet nappies. If you spot these signs, seek medical help immediately, as advised by National Institute for Health and Care Excellence (NICE) clinical guidelines[2].

Signs in the Elderly

As we get older, our natural sense of thirst becomes much weaker and our fluid reserve decreases, which has been proven in clinical sports medicine studies[3]. Conditions like Alzheimer's disease can also stop older people from realising they need a drink. Elderly people might show signs of confusion, sunken eyes, a rapid heart rate, or constipation. A quick test for carers is to gently pinch the skin on the back of their hand. If the skin stays pinched and does not snap back into place immediately, they may be dehydrated.

How much fluid should you drink a day?

The NHS and the Eatwell Guide recommend that most adults drink six to eight glasses of fluid every day, which is about two litres. You will need to drink more than this if you are exercising, sitting in hot weather, or recovering from an illness.

However, if you have a heart condition like heart failure, or severe kidney disease, you may be placed on a fluid restriction. This is because your organs cannot process too much water, and excess fluid can build up dangerously in your lungs. Always follow your doctor's specific advice if you have these health conditions.

What are the best drinks for staying hydrated?

Plain water is the healthiest choice for staying hydrated because it contains no calories or sugar. Lower fat milk, sugar free squash, and tea or coffee also count towards your daily intake. You should limit sugary fruit juices, alcohol, and highly caffeinated energy drinks.

When choosing your drinks, it is important to be mindful of sugar and caffeine. In fact, a landmark study published in The American Journal of Clinical Nutrition found that milk and oral rehydration solutions can actually keep you hydrated for longer than plain water because of their mineral content[4].

Here is a simple guide on what to drink and what to limit:

What happens if dehydration is left untreated?

If severe dehydration is left untreated, it can lead to dangerous complications like painful kidney stones, heat exhaustion, and seizures. It can also cause a very fast heart rate and low blood pressure. Severe dehydration is a medical emergency that requires hospital treatment.

Your kidneys act like a filter for your body. When you do not drink enough, these filters struggle to work. The minerals in your urine can clump together to form crystals, which eventually turn into kidney stones, a fact strongly supported by Cochrane Database reviews[5].

Furthermore, when you are severely dehydrated, your overall blood volume drops. Your heart has to beat much faster to pump this thick blood around your body. This places a heavy and dangerous strain on your cardiovascular system, as noted in the Journal of Applied Physiology[6].

How can you easily prevent dehydration?

You can easily prevent dehydration by carrying a reusable water bottle and sipping from it regularly throughout the day. Eating water rich foods like cucumber, watermelon, and soups will also boost your fluid levels. Do not wait until you feel thirsty to take a drink.

Here are some of the easiest everyday tips to keep your hydration levels perfectly balanced:

• Manage Night Time Worries: Many older adults intentionally stop drinking because they worry they will not reach the toilet in time. If this sounds like you, do not drink alcohol or tea close to bedtime. Drink the majority of your water earlier in the afternoon instead.

• Carry a Toilet Card: If a fear of incontinence stops you from drinking when you are out of the house, you can order a free toilet card from charities like Age UK. This card discreetly lets shops and businesses know you need urgent access to a toilet.

• Eat Your Water: Roughly 20 percent of your daily fluid intake actually comes from food. Cucumber, frozen fruits, soups, ice lollies, jelly, and custard are all fantastic, high fluid choices.

• Drink Before You Exercise: Do not wait until you are sweating. Drink water a few hours before physical activity, sip every 15 minutes during the workout, and rehydrate fully afterwards.

What is the fastest way to cure dehydration?

The fastest way to cure mild dehydration is to drink an oral rehydration solution, such as Dioralyte. These simple pharmacy treatments contain the perfect balance of water, sugars, and essential minerals like sodium to restore your body much quicker than plain water.

When you sweat heavily or suffer from a sickness bug, you do not just lose water. You lose vital minerals called electrolytes that your nerves and muscles need to function. Drinking lots of plain water will not replace these minerals fast enough. Rehydration sachets, such as Dioralyte, are based on official World Health Organization (WHO) formulas[7], making them the smartest way to tackle sudden dehydration effectively.

Frequently Asked Questions

Can you drink too much water?

Yes, though it is very rare. Drinking huge amounts of water in a very short time can cause a dangerous condition called hyponatremia. This is where the salt levels in your blood drop too low, according to international sports medicine guidelines[8]. It is best to stick to the recommended two litres a day unless you are sweating heavily.

Can I drink caffeine if I am pregnant?

You can, but only in moderation. The NHS strongly advises pregnant women to limit their caffeine intake to no more than 200mg a day, which is about two mugs of instant coffee, aligning with the Royal College of Obstetricians and Gynaecologists (RCOG) advice[9]. Drinking too much can lead to dangerous fluid loss and increases the risk of a low birth weight.

When should I see a doctor for dehydration?

You should call 999 or visit A&E immediately if you or someone else is confused, feels dizzy constantly, has a rapid heartbeat, has not urinated all day, or suffers a seizure. These are warning signs of severe, life threatening dehydration that requires medical intravenous (IV) fluids in a hospital.

Final Thoughts From Our Clinical Team

'Staying properly hydrated is one of the simplest yet most powerful things you can do for your overall health, especially for your kidneys and heart. Remember that waiting until you are thirsty means your body is already playing catch up. By keeping a water bottle nearby, eating plenty of high fluid foods like soups and fruits, and keeping oral rehydration sachets in your cupboard for emergencies, you can protect your organs and boost your energy. Never let the fear of using the toilet stop you from nourishing your body with the water it desperately needs.'

Sources and References

1. International Longevity Centre UK (ILC-UK). Hydration and Older People in the UK.

2. National Institute for Health and Care Excellence (NICE). Clinical Guideline [CG84]: Diarrhoea and vomiting caused by gastroenteritis in under 5s: diagnosis and management.

3. Kenney, W. L., & Chiu, P. (2001).Influence of age on thirst and fluid intake. Medicine & Science in Sports & Exercise.

4. Maughan, R. J., et al. (2016). A randomized trial to assess the potential of different beverages to affect hydration status: development of a beverage hydration index. The American Journal of Clinical Nutrition.

5. Qiao, L., et al. (2020). Water for preventing urinary stones. Cochrane Database of Systematic Reviews.

6. Cheuvront, S. N., & Kenefick, R. W. (2014). Dehydration and cardiovascular function. Journal of Applied Physiology.

7. World Health Organization (WHO). Guidelines on the Management of Diarrhoea and use of Oral Rehydration Salts (ORS).

8. Hew-Butler, T., et al. (2015). Statement of the 3rd International Exercise-Associated Hyponatremia Consensus Development Conference. Clinical Journal of Sport Medicine.

9. Royal College of Obstetricians and Gynaecologists (RCOG) / NHS.Maternal Health Guidelines on caffeine consumption during pregnancy.