evidence: Ferrero is mounting an ad campaign countering claims that a key Nutella ingredient might be carcinogenic — by telling people the hazelnut spread would be less delicious if it were to make changes and eliminate a "potential health concern." About a fifth of Ferrero’s sales come from its wildly popular flagship product, so the company is hesitant to do anything that might change its taste. That includes caving to pressure to source less palm oil, an ingredient whose use also causes massive deforestation and has created years of headaches for Ferrero. [...] Ferrero’s ads explain Nutella is "safe" because it’s made using a special industrial process. It costs 20 percent more, but keeps everything "just below" 200 degrees and relies on low pressure to reduce contaminants to a level "so low that scientific instruments find it hard to trace" them.