food marketing used to much more aggressively bash competitors' products. many of the companies funding the yo-yo "X is good/bad for you studies" are basically

food marketing used to much more aggressively bash competitors' products. many of the companies funding the yo-yo "X is good/bad for you studies" are basically just stealthier versions of this, if you look at who is funding the studies. the most prominent example of this is Heinz ketchup, where Heinz lobbied for the FDA and essentially got most of its competitors out of the market as a result; Heinz was the only major ketchup producer not using preservatives. https://archive.ph/1y8f5 https://archive.ph/1y8f5 --- IIRC the major problem in food science is that most of the people willing to pay for food studies are food makers.