Grain drain: should everyone adopt a gluten-free diet?

About 1% of people can’t process gluten, yet endorsements from celebrities such as Victoria Beckham and Novak Djokovic allied with health fears mean the ‘free-from’ market is booming among non-coeliacs. Are the benefits real?It’s hard to imagine a high-street fashion chain selling something that jokily referenced irritable bowel syndrome or a nut allergy. Yet last year, Zara brought out a T-shirt emblazoned with the slogan: “Are you gluten-free?” Understa