evidence: Foods that contain palm oil could pose a cancer risk, according to the European Food Safety Authority (EFSA), and Nutella has so far faced the brunt of the public backlash. [...] The report by EFSA said palm oil is more carcinogenic than any other oil, echoing similar claims made by the World Health Organisation. Several retailers in Italy – including Coop, the country's biggest supermarket chain – have even boycotted the chocolate and hazelnut spread over the claims. But Ferrero, which makes the spread, has hit back by launching an advertising campaign to assure people that its product is safe. Nutella is the company's flagship product and makes up about a fifth of its sales, The Telegraph reported.