THIRST THINGS SECOND

I’ve always wondered why we feel hungry before we actually are, but don’t feel thirsty until we’re already slightly dehydrated. Here’s what “Hydration and health : a review” says in the British Nutrition Foundation Nutrition Bulletin of March 2010. “The body’s first response … is to conserve water by signalling the kidney to concentrate the urine … The initiation of the thirst response then occurs after this, when loss of body mass is 1% to 2%.”