When the new food labels roll out in a year or two, a 20 ounce Pepsi will have to say it contains 130% of your daily value of added sugar. Yogurts will have to call out their added sugar, so we can’t kid ourselves that it all comes from fruit. Food companies fought the change, but they lost.
It would be nice to know what foods insist that they add a bunch of sugar when there isn’t a need to. It’s less of a health concern and more of an openness concern. If you eat a yogurt, you might assume that all the labeled sugars are entirely necessary in order for the yogurt to still be yogurt. That’s false. Yogurts have a lot of sugar added that didn’t need to be there for it to be a yogurt, and if people were to demand less added sugar, food would move towards forms which have less sugar.
Even if it’s a meaningless differentiation between added and non-added sugars biochemically, it’s not a meaningless differentiation if making the distinction causes people to make healthier life choices. Sometimes you have to show people the right true statement in order to get them to change. Heck, if we chose to label daily intakes in fractions instead of percents, that might even cause a significant difference eating habits, since people may treat 3/2 different than 150% in their mind.