Hydration in the local climate: how much and what to drink

Glasgow gets roughly 1,150 millimetres of rainfall a year — more than London, more than Edinburgh, more than almost anywhere else in mainland Britain people casually compare it to. And yet dietitians working across the city's health centres consistently flag dehydration as one of the most underreported dietary problems they encounter. The grey skies, it turns out, mask a real physiological gap.

The timing matters. July in Glasgow rarely delivers Mediterranean heat, but this week temperatures in the city centre have been nudging 19 to 21 degrees Celsius — warm enough, particularly indoors and on the subway, to push fluid losses well above what most people account for. Add to that the fact that hormonal research published just days ago has renewed public interest in how hormones including melatonin and cortisol interact with hydration at a cellular level, and the conversation about what Glaswegians are actually putting in their bodies feels suddenly urgent.

What the numbers say — and what Glasgow is doing about it

The European Food Safety Authority recommends 2 litres of total fluid intake daily for women and 2.5 litres for men, with roughly 20 percent typically coming from food. That figure climbs with physical activity, alcohol consumption, or even moderate urban walking — all of which feature prominently in Glasgow life. A brisk walk from Partick to the West End's Byres Road in July sunshine will burn through fluid reserves faster than most people realise.

NHS Greater Glasgow and Clyde has been running its Live Well programme across community hubs in Maryhill and Govan since 2023, and hydration sits explicitly within its nutritional coaching sessions. Staff there work with clients to distinguish between genuine thirst signals and appetite, a mix-up that contributes to both undereating and overeating in different populations. The programme is free at the point of access and takes self-referrals.

The Merchant City's Braw Juice bar on Candleriggs Street has seen a 30 percent increase in cold-pressed vegetable juice sales since May, according to its counter staff — not because customers suddenly understand electrolytes, but because the products feel lighter than coffee during warmer weeks. That intuition is broadly correct: cucumber-heavy juices, coconut water, and diluted fruit presses all contribute meaningful potassium and sodium alongside fluid, which matters for absorption. Plain water, despite its reputation, is actually absorbed slightly less efficiently than drinks containing small amounts of dissolved minerals.

Tap water in Glasgow, drawn from Loch Katrine and maintained by Scottish Water, is consistently rated among the softest and purest in the United Kingdom. Its low mineral content is a quality of life boon but does mean it delivers fewer electrolytes per glass than water in harder-water cities like London or Manchester. Glaswegians who exercise regularly — and the city's cycling and running communities along the Clyde Walkway are substantial — may benefit from occasionally supplementing plain water with a pinch of sea salt and a squeeze of lemon, a low-cost alternative to commercial electrolyte sachets that retail for between £1.20 and £2.50 per serving in most city pharmacies.

Practical choices for a city that forgets to drink

Caffeinated drinks remain the city's dominant fluid source. Coffee culture runs deep from the Barras to Finnieston, and while moderate caffeine intake does not cause the dramatic net dehydration once assumed — research published in the American Journal of Clinical Nutrition in 2014 found mild diuretic effects only above 300mg caffeine daily — defaulting entirely to flat whites and Americanos still crowds out more hydrating options.

Herbal teas, particularly those served at venues like the Willow Tea Rooms on Buchanan Street, offer a culturally comfortable route toward higher fluid intake without the caffeine load. A 500ml pot costs around £4.50, delivers meaningful hydration, and carries none of the blood pressure concerns associated with high-volume coffee consumption.

The practical baseline is straightforward: aim for pale yellow urine as a rough daily marker, carry a reusable bottle — Buchanan Galleries has a free public refill station — and treat cloudy skies as permission to ignore thirst cues, not as proof that your body doesn't need the water. It does. Consult your GP or a registered dietitian at one of NHS Greater Glasgow and Clyde's health centres if you have specific concerns about fluid intake or related symptoms.