Water, water, everywhere
“Hydration,” says Dr John Briffa, “is very important. It’s been found that relatively mild dehydration, as little as 1pc, is enough to cause problems around concentration and mood.
“A lot of people will recommend two litres, or eight glasses of water,” continues Dr Briffa. “All of this is nonsense really because the amount you need to drink varies enormously between people and how much they’re sweating, or what the weather is doing. You need to be drinking enough fluid to keep your urine pale yellow; if you’re doing that, you’re almost certainly well hydrated. Thirst is a pretty poor and late indicator of dehydration.”