Overview
- News reports say large parts of Britain are under Met Office red heat warnings with temperatures forecast to reach roughly 37–40°C, raising health risks for people exposed to the heat.
- Specialists stress that thirst is a late sign of dehydration and advise regular sipping of fluids throughout the day to prevent symptoms from developing.
- Subtle signs to watch for include headache, poor concentration, persistent bad breath and cravings for salty or sugary snacks, which experts link to low fluid levels.
- Practical guidance includes aiming for a baseline of about six to eight glasses of fluid daily and increasing intake toward roughly three litres when active or spending long periods outdoors, while using pale-yellow urine as a simple hydration check.
- The UK Health Security Agency cautions that overdrinking can disrupt electrolyte balance and cause harm, so people should prefer water, milk or sugar-free drinks, limit excess caffeine, and pay special attention to older adults, infants and outdoor workers.