The report’s authors found that fruit and vegetables had risen in price by up to 91 per cent in real terms between 1990 and 2012, a bigger increase than for other any other food group. “In high income countries over the last 30 years it seems that the cost of healthy items in the diet has risen more than that of less healthy options, thereby encouraging diets that lead to excess weight,” said Steve Wiggins, one of the authors of the report.