Precautionary labelling is a minefield for food businesses, but new work from the FAO will help — This is an extract from The Rotten Apple, a weekly newsletter for food professionals, policy-makers and purveyors. Subscribe for weekly insights, latest news and emerging trends in food safety, food authenticity and sustainable supply chains. 🍏 Discover The Rotten Apple 🍏 Traces of allergens in foods; how much is too…