Hydration; A clear simple guide

Water keeps your body working — your brain, energy, digestion and temperature control all rely on it. This post explains what really matters, simple checks you can use, and easy tips to stay well-hydrated in everyday life.

Why water matters (plain language)

Water is in every cell: 

• moves nutrients and oxygen around your body 
• helps your kidneys remove waste 
• cools you when you sweat 
•  keeps joints and skin working well 
• helps you think clearly and stay alert

Even slight dehydration (the kind you hardly notice) can cause tiredness, headaches and poor concentration.

How your body looks after fluids

• Your brain and kidneys balance water and salts. 
• If you’re low on fluid you feel thirsty and your urine is smaller and darker. 
• When you drink, your body relaxes that hold and you go toilet more and the urine is paler. 

For most healthy adults, thirst and urine colour are good, simple guides. Older people may need reminders to drink because thirst can be unreliable.

How much should you drink?

There is no single perfect amount for everyone however personally I would recommend:

Daily totals (total water = drinks plus food)

• Men: about 2.6–3.7 litres/day
• Women: about 2.0–2.7 litres/day

Equivalents by common container size

250 ml glass (a typical small glass)

• Men: 10–15 glasses a day
• Women: 8–11 glasses a day

200 ml glass (tea-cup size)

• Men: - 13–19 glasses 
• Women: - 10–14 glasses 

300 ml glass (larger glass / travel cup)

• Men: -  9–12 glasses 
• Women: - 7–9 glasses 

500 ml refillable bottle (common reusable bottle)

• Men: - 5–7 bottles 
• Women: - 4–5 bottles 

These are averages. You’ll need more:

• when it’s hot or humid 
• when you exercise or sweat a lot 
• if you’re pregnant or breastfeeding

About 20–30% of your fluid usually comes from food (fruit, veg, soups, yoghurt).

Simple home checks

Thirst:

• If you’re thirsty, drink. 

Urine colour:

• Aim for pale straw or light yellow.

Dark yellow means drink more.

• Very dark urine or very little pee needs medical advice. 

Daily tips that actually help

• Carry a refillable bottle.
• Seeing it helps you remember. Use 500–750 ml bottles and refill. 
• Pair drinking with habits.
• Drink after you wake, with meals, and after the loo. 
• Break the day into chunks.
• Refill a 500 ml bottle several times rather than thinking of a big number. 
• Mix drinks.
• Tea and coffee count (in moderation). Milk and fortified milks add fluid with nutrients. 
• Limit sugary drinks.
• Fizzy drinks and fruit juices add calories and sugar. Keep them occasional. 
• Eat water-rich foods.
• Cucumber, tomatoes, melon, soups and yoghurt all help. 

 

Final thought 

Hydration doesn’t need to be complicated. One small habit this week — carry a bottle, drink with meals or add a hydrating snack — will make a difference to your energy and focus. Start there and build up.