The undisputed benefit of water

It is commonly said that we should all drink at least 2 litres of water a day. This is not really true: it helps to drink plenty of water, but how much you drink will depend on the climate, your size, your metabolism and your diet (some 20 per cent of your water intake can come from food).

The effects of dehydration (loss of concentration, tiredness, irritability) may begin to kick in when you lose just 1 to 2 per cent of your normal water content, so it is worth keeping drink to hand, and to drink slightly more than your thirst dictates — but not excessive quantities.

And if that drink is mineral water — as opposed to fizzy drinks, coffee or alcohol — so much the better. It could be tap water, too — but if it takes the lure of bottled mineral water to get you there, then it has had an undisputed benefit.

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