Drink water, but only in moderation

摘要

I RECENTLY commented on an NHS leaflet that offers tips on "better eating" based on popular beliefs that lack good evidence, such as the supposed need to consume five portions of fruit and vegetables a day (PJ, 8 June 2013, p684) and the alleged benefits of a hearty breakfast (PJ, 20 July 2013, p94). A further tip is: "Have plenty to drink, including water." At least, the leaflet does not repeat the common belief that we should all drink at least 2L of water a day. Again, this is a claim with no evidence base to support it.