> If all the food producers decide to use the same cheapest ingredient, what help does labeling provide?

But in what world is that true? In any grocery store you can get food that is organic or non-organic, GMO or non-GMO, with sugar or sugar-free, with fat or fat-free, kosher or not kosher, vegan or non-vegan. We consumers have more food choices today than we've ever had in the past. To claim that "all food producers" will just "use the same cheapest ingredient" is a straw man.