A closer look at dehydration, how it actually feels, and a new free tool to help you get ahead of it.
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You know the feeling. It’s mid-afternoon, your focus has gone soft round the edges, and you’ve reached for your second (or third) coffee without really thinking about it. You assume it’s tiredness, or too many meetings back to back, or just “one of those days.”
Often, though, it’s something much simpler: you haven’t had enough water.
Don’t wait until you’re thirsty
Thirst is a delayed signal. By the time your body sends it, you’re often already mildly dehydrated. Although mild dehydration doesn’t announce itself the way hunger does, it shows up obliquely, as symptoms that are easy to misinterpret as something else entirely.
For desk-based work in particular, this matters. Long, uninterrupted stretches at a screen, air-conditioned or heated offices, and a coffee-driven routine all make it easy to go hours without a hydrating drink — and easy to miss the early signs when it happens. Some workers will even ration their water intake intentionally to avoid too frequent loo breaks.
What mild dehydration feels like
Mild dehydration tends to feel like a general dip across a few areas at once:
- Energy — a flat, tired feeling that coffee or other caffeinated drinks doesn’t quite touch
- Focus — trouble concentrating, re-reading the same line, losing your thread mid-task
- Mood — lower patience, a shorter fuse than usual
- Head — a dull, low-grade headache that creeps in gradually
- Body — dry mouth, tired eyes, maybe even slight light-headedness on standing
Individually, none of these feel alarming. If you experience some or all together, day after day, they add up to exactly the kind of energy slump most of us class as normal, particularly mid afternoon.
How much water do you actually need?
The honest answer is: it depends. Body size, activity level, the temperature of your office, how much caffeine you drink — all of it changes what “enough” looks like for you. And you can of course obtain water from food during the day, especially if you’re choosing fruit and salads or soups. So generic advice like “drink eight glasses a day” is a reasonable starting point but not a personal one.
To make this easier, we’ve built a free hydration calculator. It takes a few quick details about you and gives a personalised daily target, rather than a one-size-fits-all number. It’s live now on the YoPO website — free to use via the link at the end of this blog.
Is drinking plain water a chore?
Plenty of people drink less than they’d like to simply because they find plain water dull. A few easy switches that might help:
- A squeeze of lemon, lime, or a few slices of cucumber or sprigs of mint added to your water bottle
- Herbal or fruit teas, hot or over ice
- Sparkling water in place of still
- A splash of no-added-sugar squash
And a reusable bottle you actually enjoy using – including a volume scale if you like to have targets.
A small habit with a real payoff
Hydration is one of the few wellbeing basics that’s genuinely low effort to fix. It doesn’t require a new routine, extra time, or willpower in the way sleep or exercise might. It mostly just requires noticing — and keeping water near you in a form that’s easy and appealing to reach for.
Try the calculator, find your target, and see whether a few of those “just one of those days” feelings start to lift.
A note for employers
Research consistently links even mild dehydration to reduced concentration, slower reaction times, and dips in cognitive performance — which in desk-based roles can mean more missed details, slower decision-making, and a collective dip in output, especially in the afternoon. It’s an often-overlooked factor, and one that is easy to provide meaningful support on: cool water on tap, alternatives to coffee such as iced tea or fruit-infused water, and fridge access for proper lunches all make it easier teams to stay on top of it. The hydration calculator is free for employees to use — a simple tool with a genuine impact on focus and output.
YoPO can provide resources for employers including:
- a tick list of easy steps that can be taken to demonstrate your focus on desk workers’ wellbeing being at the heart of your operations, and
- bespoke advice on navigating any hurdles specific to your workplace
- referral to other wellbeing providers for specialist needs
If you would like any further information or to request access to YoPO’s wellbeing resources for desk workers and their employers, please contact hello@yoponow.com.
Helen Withers, Director, YoPO Wellbeing Limited