Processed food always being bad is an oversimplification. Try having eating a raw potato sometime and you'll see what I mean (seriously don't they are toxic). Cooking is a basic form of processing to make the foods nutrition actually processable or processable more efficiently. The 'processing' most associated with the term are optimized for taste and shelf life often at the expense of nutrition or too much of a good thing. For instance protein - it is held up as a holy grail 'good nutrient' but it turns out that going too high is bad for the kidneys and thus general health. That isn't unique to processed foods either - Steve Job's fruit based diet put Ashton Kutcher in the hospital with pancreatic issues when he tried it for getting into character!
Past failures at making something more healthy have failed to measure an additional variable - say margarine being better before a sufficient understanding of transfats and back when they thought all cholesterol was the same.
Past failures at making something more healthy have failed to measure an additional variable - say margarine being better before a sufficient understanding of transfats and back when they thought all cholesterol was the same.