[NPC82]

>There is no percentage for proteins and yet nobody would argue that it's a trick from big food so clearly there must be a reason why some rows have no percentage?

Yeah it begs the question for sure. According to the Dietary Guidelines for Americans [1, pg128], the research shows that Americans have no problem consuming lots of meats that contain protein, and so it's probably not listed for that reason. I've even been taught simply that we eat too much protein as a country. Generally, the only major group that struggles with protein would be those aged 71 and over, because their requirements are higher than a middle-aged average adult.

IIRC the FDA picks and chooses to list daily %ages for things that most(?) Americans will struggle with, but there's also some voluntary options for manufacturers that might want to flaunt added vitamins - a good example is Vitamin C because no one struggles with this but when it's added to a children's gummy nutrition facts voluntarily it then gives them a slight marketing advantage.

[1] https://www.dietaryguidelines.gov/