Factory fast food knows exactly what is in their cookie cutter assembly line offerings.
The food is engineered down to the milligram to trigger consumption.
They put in exact amounts of sugar, salt, fat, protein and pickles to make you crave the next bite. The food scientists in the test kitchens know what the food offerings are constructed from. They know the calorie count +/- 1%.
There is no reason they can't just let us know what we're eating.