I’m writing this with a crisp glass of verdejo in hand, curled into a worn leather armchair in our Cornish holiday cottage (after some negotiation with the dog). It’s a welcome reward following a day at the beach, where the idyllic photographs belie the effort required to ensure nobody gets too hot, too cold, or swept out to sea. So many of us use a drink at the end of a long day to relax, to celebrate our joys and forget our woes. It might act as a tonic for the soul, but is even one glass a day damaging our health? It is according to the authors of a…