Knowing how to tell if you need to hydrate is not quite as dramatic as collapsing in a desert clutching an empty canteen. More often, it is much duller: a fuzzy head, a flat battery at 3 pm, a headache you blame on emails, or the vague sense that your brain has gone out for a walk without leaving a forwarding address.
Hydration, in other words, is rarely theatrical. It is usually admin. And because of that, many people miss the early signs.
Yusuf Okhai, Managing Director of ION8, says the mistake begins with one of the great myths of everyday wellbeing: that thirst is the body’s opening bell.
“One of the biggest myths is that thirst is an early warning sign,” says Yusuf. “For many people, thirst only becomes obvious once the body is already running low on fluid. By that point, it may already be affecting how you feel, think and perform.”
Why Thirst Is A Late Guest To The Party
For anyone trying to work, train, travel or simply remain civil through a long afternoon, mild dehydration can be surprisingly sneaky. It does not always march in waving a flag marked “water”. It may turn up as tiredness, poor concentration, a headache or that familiar mid-afternoon fade when the chair becomes suspiciously comfortable.
“People often blame those symptoms on stress, screens, lunch or a bad night’s sleep,” he explains. “Those things can all play a role, but dehydration is one of the simplest things to check first. It is easy to overlook because it does not always feel like thirst.”
UK guidance says most people should aim for around six to eight cups or glasses of fluid a day, while recognising that needs can rise with heat, illness, pregnancy, breastfeeding or prolonged physical activity. The NHS also notes that water, lower-fat milk, lower-sugar drinks, tea and coffee can all contribute to daily fluid intake.
That last point is useful, if slightly dangerous in the wrong hands. Yes, tea and coffee count. No, a desk littered with mugs is not automatically a hydration strategy, particularly if the water bottle has become a decorative object.
The Urine Colour Hydration Test
The simplest way to check whether you may need more fluid is not glamorous, but then neither is dehydration.
Look at your urine colour.
“Urine colour is a simple, free check most people can use,” he says. “Pale straw-coloured urine is usually a good sign. If it is darker, it may be your body telling you to drink more. It is not perfect, but it is more useful than waiting until you feel really thirsty.”
The British Dietetic Association describes pale straw-coloured urine as a useful sign of good hydration, while darker urine can suggest the body needs more fluid. The NHS similarly advises aiming for clear, pale yellow pee during the day.
It is not a diagnostic crystal ball. Certain foods, supplements and medications can change urine colour, and persistent changes, pain, blood, very dark urine or feeling seriously unwell should not be waved away with a jaunty sip from a sports bottle. But as a quick everyday check, it is practical, free and considerably more reliable than pretending your fourth coffee is basically a mountain spring.
Dehydration Is Not Just A Heatwave Problem
The classic image of dehydration belongs to summer: sunburnt shoulders, wilting tennis players, and someone on a train platform fanning themselves with a receipt. But Okhai says the risk is not confined to hot weather.
“Dehydration is often treated like a summer heatwave problem, but it can happen all year round,” says Yusuf. “A long day in a warm office, several coffees and very little water can leave you feeling drained, even if you have barely been outside.”
That matters for office workers, frequent travellers, gym-goers and anyone spending long hours in heated indoor spaces. Cooler weather can make thirst less noticeable. Screen-heavy work can absorb attention. Busy meetings can turn a basic glass of water into something apparently requiring a project manager.
Age can also play a role. As people get older, thirst signals may become less obvious, which means some of those more vulnerable to dehydration may not feel thirsty early enough to act.
How To Tell If You Need More Water During The Day
The everyday signs of dehydration can include thirst, headache, light-headedness, tiredness, dry mouth and darker, stronger-smelling urine. The NHS also lists peeing less often than usual and feeling dizzy among common symptoms.
But the more useful lesson is not to wait for the body to start complaining.
Start with water before your first tea or coffee, particularly after several hours asleep. Keep a reusable bottle visible on your desk, in your gym bag or beside you while travelling. Take small, regular sips rather than attempting to rescue the day with a heroic pint at 5 pm.
Hydration is not a moral test. It is not a wellness identity. It is simply one of the easier levers to pull when your energy, focus or performance starts to sag.
When Your Fluid Needs May Increase
Your baseline fluid needs are not fixed. They move with the day.
Exercise, travel, alcohol, illness, warm indoor spaces, long working hours and hot weather can all increase the need for fluids. So can sweating more than usual, spending long periods on your feet, or moving from one climate-controlled environment to another while barely noticing the body is quietly running behind.
That is why the best hydration routine is flexible rather than obsessive. Drink regularly. Check urine colour. Adjust for the day you are actually having, not the tidy imaginary one where you slept perfectly, ate sensibly and did not spend six hours staring at a glowing rectangle.
“Nobody needs to obsess over water,” he adds. “The goal is simply to close the gap between how hydrated people think they are and how hydrated they actually are. A few small habits can make a real difference to energy, focus and how you feel by the end of the day.”
A decent hydration habit will not make you immortal, charming in traffic, or capable of enjoying a 9 am spreadsheet meeting. But it may just stop your afternoon from turning into a slow-motion power cut. And frankly, that is a good start.
