A concrete manifestation of this my family runs into all the time is when trying to buy Greek yogurt. There are fat-free versions galore, all either loaded wit

A concrete manifestation of this my family runs into all the time is when trying to buy Greek yogurt. There are fat-free versions galore, all either loaded with sugar or artificial sweeteners. Full-fat Greek yogurt is plenty sweet without any additives, and my understanding of the science is that it's much healthier for you, but it's sometimes tricky to find it because there's little demand. Greek yogurt is bought by people who nominally care about nutrition—its main selling point is higher protein—but because of these guidelines the demand is for the high-protein high-sugar versions and not the naturally sweet full-fat.